INFO: task hung in grab_super

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syzbot

unread,

Apr 17, 2019, 11:33:05 PM4/17/19

to syzkaller...@googlegroups.com

Hello,

syzbot found the following crash on:

HEAD commit: 4b0e041c Linux 4.19.35
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=175acd2d200000
kernel config: https://syzkaller.appspot.com/x/.config?x=bb1bcac868b1655e
dashboard link: https://syzkaller.appspot.com/bug?extid=a68eb85ce975f886362f
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a68eb8...@syzkaller.appspotmail.com

protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
INFO: task syz-executor.0:7892 blocked for more than 140 seconds.
Not tainted 4.19.35 #3
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0 D28408 7892 9983 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x813/0x1d00 kernel/sched/core.c:3474
schedule+0x92/0x1c0 kernel/sched/core.c:3518
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:573 [inline]
rwsem_down_write_failed+0x774/0xcc0 kernel/locking/rwsem-xadd.c:602
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117
__down_write arch/x86/include/asm/rwsem.h:142 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:72
grab_super+0xaf/0x2c0 fs/super.c:383
sget_userns+0x35a/0xd30 fs/super.c:511
sget+0x10c/0x150 fs/super.c:570
mount_bdev+0xff/0x3c0 fs/super.c:1131
udf_mount+0x35/0x40 fs/udf/super.c:131
mount_fs+0xae/0x331 fs/super.c:1261
vfs_kern_mount.part.0+0x6f/0x410 fs/namespace.c:961
vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2469 [inline]
do_mount+0x53e/0x2bc0 fs/namespace.c:2799
ksys_mount+0xdb/0x150 fs/namespace.c:3015
__do_sys_mount fs/namespace.c:3029 [inline]
__se_sys_mount fs/namespace.c:3026 [inline]
__x64_sys_mount+0xbe/0x150 fs/namespace.c:3026
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458c29
Code: Bad RIP value.
RSP: 002b:00007f95a7889c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000458c29
RDX: 0000000020000140 RSI: 0000000020000080 RDI: 0000000020000000
RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f95a788a6d4
R13: 00000000004c4c0e R14: 00000000004d8888 R15: 00000000ffffffff

Showing all locks held in the system:
1 lock held by khungtaskd/1032:
#0: 0000000065b058c8 (rcu_read_lock){....}, at:
debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4438
1 lock held by rsyslogd/7309:
#0: 00000000ad54e745 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110
fs/file.c:767
2 locks held by getty/7431:
#0: 00000000fdc73ee9 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363
#1: 00000000fe0cb866 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154
2 locks held by getty/7432:
#0: 00000000d6a22189 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363
#1: 000000007ca4b455 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154
2 locks held by getty/7433:
#0: 000000008389be6c (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363
#1: 000000007a44ef95 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154
2 locks held by getty/7434:
#0: 0000000017f3f3c3 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363
#1: 00000000d7762012 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154
2 locks held by getty/7435:
#0: 000000009b734a32 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363
#1: 000000008a3ee747 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154
2 locks held by getty/7436:
#0: 0000000081e1dfa7 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363
#1: 000000005229b65e (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154
2 locks held by getty/7437:
#0: 0000000071a769d8 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363
#1: 000000005e5398b2 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154
2 locks held by syz-executor.0/7887:
2 locks held by syz-executor.0/7892:
#0: 000000000660ed67 (&bdev->bd_fsfreeze_mutex){+.+.}, at:
mount_bdev+0x93/0x3c0 fs/super.c:1125
#1: 00000000a3009529 (&type->s_umount_key#82){++++}, at:
grab_super+0xaf/0x2c0 fs/super.c:383

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 1032 Comm: khungtaskd Not tainted 4.19.35 #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:202 [inline]
watchdog+0x9c6/0xec0 kernel/hung_task.c:263
kthread+0x357/0x430 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 7887 Comm: syz-executor.0 Not tainted 4.19.35 #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:__sanitizer_cov_trace_pc+0x4b/0x50 kernel/kcov.c:111
Code: 90 d0 12 00 00 83 fa 02 75 20 48 8b 88 d8 12 00 00 8b 80 d4 12 00 00
48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 <5d> c3 0f 1f 00
65 4c 8b 04 25 40 ee 01 00 65 8b 05 60 b8 96 7e a9
RSP: 0018:ffff88805bb2f640 EFLAGS: 00000046
RAX: 0000000000040000 RBX: ffff888094760888 RCX: ffffc90005e85000
RDX: 0000000000040000 RSI: ffffffff81b8bac1 RDI: 0000000000000007
RBP: ffff88805bb2f640 R08: ffff8880a952c140 R09: fffff9400025e157
R10: fffff9400025e156 R11: ffffea00012f0ab7 R12: 0000000000000001
R13: 0000000000000001 R14: dffffc0000000000 R15: 0000000000000001
FS: 00007f95a78ab700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 0000000055d07000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000009b5f DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lookup_bh_lru fs/buffer.c:1264 [inline]
__find_get_block+0x111/0xcf0 fs/buffer.c:1291
__getblk_slow fs/buffer.c:1040 [inline]
__getblk_gfp+0x1b1/0x970 fs/buffer.c:1321
__bread_gfp+0x2f/0x300 fs/buffer.c:1355
sb_bread include/linux/buffer_head.h:307 [inline]
udf_tread+0xf1/0x140 fs/udf/misc.c:44
udf_read_tagged+0x50/0x530 fs/udf/misc.c:210
udf_check_anchor_block+0x1ef/0x680 fs/udf/super.c:1755
udf_scan_anchors+0x3f4/0x680 fs/udf/super.c:1817
udf_find_anchor fs/udf/super.c:1852 [inline]
udf_load_vrs+0x67f/0xc80 fs/udf/super.c:1917
udf_fill_super+0x7cb/0x16f5 fs/udf/super.c:2112
mount_bdev+0x307/0x3c0 fs/super.c:1158
udf_mount+0x35/0x40 fs/udf/super.c:131
mount_fs+0xae/0x331 fs/super.c:1261
vfs_kern_mount.part.0+0x6f/0x410 fs/namespace.c:961
vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2469 [inline]
do_mount+0x53e/0x2bc0 fs/namespace.c:2799
ksys_mount+0xdb/0x150 fs/namespace.c:3015
__do_sys_mount fs/namespace.c:3029 [inline]
__se_sys_mount fs/namespace.c:3026 [inline]
__x64_sys_mount+0xbe/0x150 fs/namespace.c:3026
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458c29
Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f95a78aac78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000458c29
RDX: 0000000020000140 RSI: 0000000020000080 RDI: 0000000020000000
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f95a78ab6d4
R13: 00000000004c4c0e R14: 00000000004d8888 R15: 00000000ffffffff

---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

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syzbot

unread,

Apr 19, 2019, 8:37:06 AM4/19/19

to syzkaller...@googlegroups.com

Hello,

syzbot found the following crash on:

HEAD commit: 58b454eb Linux 4.14.112
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=11f3ce7b200000
kernel config: https://syzkaller.appspot.com/x/.config?x=8b0e7ab7678533ab
dashboard link: https://syzkaller.appspot.com/bug?extid=97f1a9334f246673a1cc

compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:

Reported-by: syzbot+97f1a9...@syzkaller.appspotmail.com

FAT-fs (loop2): bogus number of reserved sectors
FAT-fs (loop2): Can't find a valid FAT filesystem
INFO: task syz-executor.1:8798 blocked for more than 140 seconds.
Not tainted 4.14.112 #2

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

syz-executor.1 D29744 8798 7140 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7be/0x1cf0 kernel/sched/core.c:3383
schedule+0x92/0x1c0 kernel/sched/core.c:3427
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:572 [inline]
rwsem_down_write_failed+0x5cd/0xbe0 kernel/locking/rwsem-xadd.c:601
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56
grab_super+0x5e/0x140 fs/super.c:373
sget_userns+0x2b3/0xc30 fs/super.c:504
sget+0xd6/0x120 fs/super.c:572
mount_bdev+0xd5/0x370 fs/super.c:1107
udf_mount+0x35/0x40 fs/udf/super.c:132
mount_fs+0x9d/0x2a7 fs/super.c:1237
vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046
vfs_kern_mount fs/namespace.c:1036 [inline]
do_new_mount fs/namespace.c:2549 [inline]
do_mount+0x417/0x27d0 fs/namespace.c:2879
SYSC_mount fs/namespace.c:3095 [inline]
SyS_mount+0xab/0x120 fs/namespace.c:3072
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x458c29
RSP: 002b:00007f90aa759c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5

RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000458c29

RDX: 0000000020000240 RSI: 0000000020000200 RDI: 0000000020000080

RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 00007f90aa75a6d4

R13: 00000000004c4c0e R14: 00000000004d8888 R15: 00000000ffffffff

Showing all locks held in the system:

1 lock held by khungtaskd/1007:
#0: (tasklist_lock){.+.+}, at: [<ffffffff81485f98>]
debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4544
2 locks held by getty/7092:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861a9863>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff831070a6>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7093:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861a9863>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff831070a6>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7094:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861a9863>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff831070a6>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7095:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861a9863>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff831070a6>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7096:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861a9863>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff831070a6>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7097:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861a9863>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff831070a6>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7098:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861a9863>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff831070a6>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.1/8798:
#0: (&bdev->bd_fsfreeze_mutex){+.+.}, at: [<ffffffff818db956>]
mount_bdev+0x76/0x370 fs/super.c:1101
#1: (&type->s_umount_key#59){+.+.}, at: [<ffffffff818d9e0e>]
grab_super+0x5e/0x140 fs/super.c:373

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 1007 Comm: khungtaskd Not tainted 4.14.112 #2

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:

__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x138/0x19c lib/dump_stack.c:53
nmi_cpu_backtrace.cold+0x57/0x94 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x141/0x189 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:194 [inline]
watchdog+0x5d8/0xb80 kernel/hung_task.c:250
kthread+0x31c/0x430 kernel/kthread.c:232
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402
Sending NMI from CPU 0 to CPUs 1:

NMI backtrace for cpu 1

CPU: 1 PID: 8785 Comm: syz-executor.1 Not tainted 4.14.112 #2

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011

task: ffff88805e362180 task.stack: ffff88805ea18000
RIP: 0010:debug_smp_processor_id+0x1c/0x20 lib/smp_processor_id.c:58
RSP: 0018:ffff88805ea1f678 EFLAGS: 00000292
RAX: 0000000000000001 RBX: ffff8880886d6be0 RCX: ffffc9000a448000
RDX: 0000000000040000 RSI: ffffffff82d7e11c RDI: ffffffff869d15c0
RBP: ffff88805ea1f678 R08: 0000000000000000 R09: ffff88805e362a48
R10: ffff88805e362a28 R11: ffff88805e362180 R12: ffffea00024453dc
R13: 0000000001420848 R14: ffff8880886d6be0 R15: dffffc0000000000
FS: 00007f90aa77b700(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007f1f0e9c3000 CR3: 00000000a9fb3000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:

rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:360 [inline]
rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:1130
rcu_read_lock include/linux/rcupdate.h:632 [inline]
find_get_entry+0x32c/0x520 mm/filemap.c:1329
pagecache_get_page+0x4a/0x750 mm/filemap.c:1442
find_or_create_page include/linux/pagemap.h:326 [inline]
grow_dev_page fs/buffer.c:1004 [inline]
grow_buffers fs/buffer.c:1077 [inline]
__getblk_slow fs/buffer.c:1104 [inline]
__getblk_gfp+0x24b/0x710 fs/buffer.c:1383
__bread_gfp+0x2e/0x290 fs/buffer.c:1417
sb_bread include/linux/buffer_head.h:307 [inline]
udf_tread+0xe8/0x130 fs/udf/misc.c:44
udf_read_tagged+0x40/0x4b0 fs/udf/misc.c:210
udf_check_anchor_block+0x19b/0x580 fs/udf/super.c:1810
udf_scan_anchors+0x3ef/0x5a0 fs/udf/super.c:1889
udf_find_anchor fs/udf/super.c:1907 [inline]
udf_load_vrs+0x5c4/0xae0 fs/udf/super.c:1972
udf_fill_super+0x727/0x157f fs/udf/super.c:2164
mount_bdev+0x2c1/0x370 fs/super.c:1134
udf_mount+0x35/0x40 fs/udf/super.c:132
mount_fs+0x9d/0x2a7 fs/super.c:1237
vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046
vfs_kern_mount fs/namespace.c:1036 [inline]
do_new_mount fs/namespace.c:2549 [inline]
do_mount+0x417/0x27d0 fs/namespace.c:2879
SYSC_mount fs/namespace.c:3095 [inline]
SyS_mount+0xab/0x120 fs/namespace.c:3072
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x458c29
RSP: 002b:00007f90aa77ac78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5

RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000458c29

RDX: 0000000020000240 RSI: 0000000020000200 RDI: 0000000020000080

RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 00007f90aa77b6d4

R13: 00000000004c4c0e R14: 00000000004d8888 R15: 00000000ffffffff

Code: e9 96 fe ff ff 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 e8 c7 f3 84
fe 48 c7 c6 80 15 9d 86 48 c7 c7 c0 15 9d 86 e8 94 fd ff ff <5d> c3 66 90
55 48 89 e5 41 54 49 89 fc e8 a2 f3 84 fe 4c 89 e6

syzbot

unread,

Apr 28, 2019, 6:34:06 PM4/28/19

to syzkaller...@googlegroups.com

syzbot has found a reproducer for the following crash on:

HEAD commit: 19bb613a Linux 4.19.37
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1428aa98a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=2f4f1677ff80cdff

dashboard link: https://syzkaller.appspot.com/bug?extid=a68eb85ce975f886362f
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11524662a00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=166f3504a00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a68eb8...@syzkaller.appspotmail.com

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 4096 failed
INFO: task syz-executor809:7974 blocked for more than 140 seconds.
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512
Not tainted 4.19.37 #5
UDF-fs: warning (device loop9): udf_fill_super: No partition found (1)
UDF-fs: Scanning with blocksize 1024 failed
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

UDF-fs: Scanning with blocksize 1024 failed
kobject: 'loop4' (00000000730b524a): kobject_uevent_env
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
kobject: 'loop4' (00000000730b524a): fill_kobj_path: path
= '/devices/virtual/block/loop4'
syz-executor809 D
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512
29448 7974 7919 0x00000004
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512
Call Trace:
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
kobject: 'loop4' (00000000730b524a): kobject_uevent_env

context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x813/0x1d00 kernel/sched/core.c:3474

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
kobject: 'loop4' (00000000730b524a): fill_kobj_path: path
= '/devices/virtual/block/loop4'
UDF-fs: Scanning with blocksize 2048 failed
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: Scanning with blocksize 2048 failed
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512
schedule+0x92/0x1c0 kernel/sched/core.c:3518
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
kobject: 'loop4' (00000000730b524a): kobject_uevent_env

__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:573 [inline]
rwsem_down_write_failed+0x774/0xcc0 kernel/locking/rwsem-xadd.c:602

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
kobject: 'loop4' (00000000730b524a): fill_kobj_path: path
= '/devices/virtual/block/loop4'
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117
UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: warning (device loop11): udf_fill_super: No partition found (1)

__down_write arch/x86/include/asm/rwsem.h:142 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:72

UDF-fs: Scanning with blocksize 1024 failed
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
grab_super+0xaf/0x2c0 fs/super.c:383
kobject: 'loop5' (0000000017b1de5b): kobject_uevent_env
kobject: 'loop5' (0000000017b1de5b): fill_kobj_path: path
= '/devices/virtual/block/loop5'
UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: warning (device loop7): udf_fill_super: No partition found (1)
kobject: 'loop4' (00000000730b524a): kobject_uevent_env
kobject: 'loop4' (00000000730b524a): fill_kobj_path: path
= '/devices/virtual/block/loop4'
sget_userns+0x35a/0xd30 fs/super.c:511
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
kobject: 'loop4' (00000000730b524a): kobject_uevent_env
UDF-fs: Scanning with blocksize 2048 failed
kobject: 'loop4' (00000000730b524a): fill_kobj_path: path
= '/devices/virtual/block/loop4'
print_req_error: 281 callbacks suppressed
print_req_error: I/O error, dev loop9, sector 64
print_req_error: I/O error, dev loop11, sector 64
print_req_error: I/O error, dev loop11, sector 256
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
kobject: 'loop3' (000000003600d18a): kobject_uevent_env
print_req_error: I/O error, dev loop11, sector 512
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512
print_req_error: I/O error, dev loop9, sector 2048
sget+0x10c/0x150 fs/super.c:570
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
mount_bdev+0xff/0x3c0 fs/super.c:1131
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
kobject: 'loop3' (000000003600d18a): fill_kobj_path: path
= '/devices/virtual/block/loop3'
UDF-fs: Scanning with blocksize 512 failed
print_req_error: I/O error, dev loop7, sector 64
udf_mount+0x35/0x40 fs/udf/super.c:131
kobject: 'loop4' (00000000730b524a): kobject_uevent_env
kobject: 'loop4' (00000000730b524a): fill_kobj_path: path
= '/devices/virtual/block/loop4'
print_req_error: I/O error, dev loop7, sector 256
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
kobject: 'loop3' (000000003600d18a): kobject_uevent_env
print_req_error: I/O error, dev loop9, sector 4096
kobject: 'loop3' (000000003600d18a): fill_kobj_path: path
= '/devices/virtual/block/loop3'
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
mount_fs+0xae/0x331 fs/super.c:1261
print_req_error: I/O error, dev loop11, sector 64
vfs_kern_mount.part.0+0x6f/0x410 fs/namespace.c:961
print_req_error: I/O error, dev loop11, sector 512
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256

vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2469 [inline]
do_mount+0x53e/0x2bc0 fs/namespace.c:2799

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
ksys_mount+0xdb/0x150 fs/namespace.c:3015
kobject: 'loop5' (0000000017b1de5b): kobject_uevent_env
UDF-fs: warning (device loop9): udf_fill_super: No partition found (1)
kobject: 'loop5' (0000000017b1de5b): fill_kobj_path: path
= '/devices/virtual/block/loop5'

__do_sys_mount fs/namespace.c:3029 [inline]
__se_sys_mount fs/namespace.c:3026 [inline]
__x64_sys_mount+0xbe/0x150 fs/namespace.c:3026

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: Scanning with blocksize 1024 failed
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
entry_SYSCALL_64_after_hwframe+0x49/0xbe
kobject: 'loop3' (000000003600d18a): kobject_uevent_env
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
kobject: 'loop3' (000000003600d18a): fill_kobj_path: path
= '/devices/virtual/block/loop3'
RIP: 0033:0x44aeb9
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512
Code: 5d ca fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7

48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff

ff 0f 83 2b ca fb ff c3 66 2e 0f 1f 84 00 00 00 00
UDF-fs: Scanning with blocksize 1024 failed
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 2048 failed
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512
RSP: 002b:00007f4ecc82bce8 EFLAGS: 00000246
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: Scanning with blocksize 2048 failed
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 4096 failed
ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000006dcc48 RCX: 000000000044aeb9
UDF-fs: warning (device loop11): udf_fill_super: No partition found (1)
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512

RDX: 0000000020000240 RSI: 0000000020000200 RDI: 0000000020000080

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512
RBP: 00000000006dcc40 R08: 0000000000000000 R09: 0000000000000000
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc4c
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
R13: 00007ffee39c32bf R14: 00007f4ecc82c9c0 R15: 0000000000000001
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: Scanning with blocksize 1024 failed
UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: warning (device loop7): udf_fill_super: No partition found (1)
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

Showing all locks held in the system:

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

1 lock held by khungtaskd/1032:

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: Scanning with blocksize 2048 failed
#0: 0000000071f1ec61 (rcu_read_lock){....}, at:
debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4435
UDF-fs: Scanning with blocksize 1024 failed
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
1 lock held by rsyslogd/7770:
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
2 locks held by getty/7892:
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512
#0:
UDF-fs: Scanning with blocksize 4096 failed
00000000f9aa85c5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
drivers/tty/tty_ldsem.c:363
UDF-fs: warning (device loop9): udf_fill_super: No partition found (1)
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512
#1: 00000000a914f5b4 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 2048 failed
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
2 locks held by getty/7893:
kobject: 'loop4' (00000000730b524a): kobject_uevent_env
#0: 000000007a641801 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363
kobject: 'loop4' (00000000730b524a): fill_kobj_path: path
= '/devices/virtual/block/loop4'
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: Scanning with blocksize 1024 failed
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
#1:
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512
000000001de80c35
kobject: 'loop4' (00000000730b524a): kobject_uevent_env
kobject: 'loop4' (00000000730b524a): fill_kobj_path: path
= '/devices/virtual/block/loop4'
(
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30
drivers/tty/n_tty.c:2154

UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 4096 failed
2 locks held by getty/7894:
UDF-fs: warning (device loop11): udf_fill_super: No partition found (1)
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: Scanning with blocksize 2048 failed
#0:
kobject: 'loop4' (00000000730b524a): kobject_uevent_env
00000000fa041c10
kobject: 'loop4' (00000000730b524a): fill_kobj_path: path
= '/devices/virtual/block/loop4'
(
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256

&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
drivers/tty/tty_ldsem.c:363

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
kobject: 'loop4' (00000000730b524a): kobject_uevent_env
#1: 000000006afde75d (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
kobject: 'loop4' (00000000730b524a): fill_kobj_path: path
= '/devices/virtual/block/loop4'
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
2 locks held by getty/7895:
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 4096 failed
#0: 00000000f3892b5e (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363
kobject: 'loop5' (0000000017b1de5b): kobject_uevent_env
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: Scanning with blocksize 1024 failed
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
UDF-fs: warning (device loop7): udf_fill_super: No partition found (1)
#1:
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
00000000f6c803c0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154
kobject: 'loop5' (0000000017b1de5b): fill_kobj_path: path
= '/devices/virtual/block/loop5'
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
2 locks held by getty/7896:
kobject: 'loop4' (00000000730b524a): kobject_uevent_env
kobject: 'loop4' (00000000730b524a): fill_kobj_path: path
= '/devices/virtual/block/loop4'
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
#0:
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: Scanning with blocksize 2048 failed
kobject: 'loop3' (000000003600d18a): kobject_uevent_env
00000000ad2de72c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
drivers/tty/tty_ldsem.c:363
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
kobject: 'loop3' (000000003600d18a): fill_kobj_path: path
= '/devices/virtual/block/loop3'
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512
#1:
kobject: 'loop4' (00000000730b524a): kobject_uevent_env
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
kobject: 'loop4' (00000000730b524a): fill_kobj_path: path
= '/devices/virtual/block/loop4'
0000000026ca1b74 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
2 locks held by getty/7897:
UDF-fs: Scanning with blocksize 512 failed
#0: 00000000a63d820b (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
kobject: 'loop4' (00000000730b524a): kobject_uevent_env
#1: 00000000128d7fcb (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
kobject: 'loop4' (00000000730b524a): fill_kobj_path: path
= '/devices/virtual/block/loop4'
2 locks held by getty/7898:
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
#0: 00000000bdfc4938 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363
UDF-fs: Scanning with blocksize 1024 failed
kobject: 'loop5' (0000000017b1de5b): kobject_uevent_env
#1:
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512
00000000d9c85de5 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
kobject: 'loop5' (0000000017b1de5b): fill_kobj_path: path
= '/devices/virtual/block/loop5'
UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: warning (device loop9): udf_fill_super: No partition found (1)
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
1 lock held by syz-executor809/7969:
1 lock held by syz-executor809/7971:
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: Scanning with blocksize 1024 failed
kobject: 'loop3' (000000003600d18a): kobject_uevent_env
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
2 locks held by syz-executor809/7945:
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512
kobject: 'loop3' (000000003600d18a): fill_kobj_path: path
= '/devices/virtual/block/loop3'
2 locks held by syz-executor809/7974:
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512
#0: 000000008fbcb0fb (&bdev->bd_fsfreeze_mutex){+.+.}, at:
mount_bdev+0x93/0x3c0 fs/super.c:1125
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 2048 failed
#1:
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
00000000bf0799f9 (&type->s_umount_key#52){+.+.}, at: grab_super+0xaf/0x2c0
fs/super.c:383
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: Scanning with blocksize 2048 failed
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
4 locks held by syz-executor809/11416:
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512
1 lock held by syz-executor809/11413:
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
2 locks held by syz-executor809/11424:
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: Scanning with blocksize 1024 failed
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
#0: 000000003e08714a (&bdev->bd_fsfreeze_mutex){+.+.}, at:
mount_bdev+0x93/0x3c0 fs/super.c:1125
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: warning (device loop11): udf_fill_super: No partition found (1)
#1: 000000005744e45a (&type->s_umount_key#52){+.+.}, at:
grab_super+0xaf/0x2c0 fs/super.c:383
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
1 lock held by syz-executor809/11418:
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: Scanning with blocksize 2048 failed
2 locks held by syz-executor809/11426:
UDF-fs: Scanning with blocksize 4096 failed
#0: 00000000016ab533 (&bdev->bd_fsfreeze_mutex){+.+.}, at:
mount_bdev+0x93/0x3c0 fs/super.c:1125
UDF-fs: warning (device loop7): udf_fill_super: No partition found (1)
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
#1: 00000000fede4fbe (&type->s_umount_key#52){+.+.}, at:
grab_super+0xaf/0x2c0 fs/super.c:383
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 512 failed
=============================================

UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: warning (device loop9): udf_fill_super: No partition found (1)

NMI backtrace for cpu 0

CPU: 0 PID: 1032 Comm: khungtaskd Not tainted 4.19.37 #5

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]

check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline]
watchdog+0x9df/0xee0 kernel/hung_task.c:287

kthread+0x357/0x430 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413

Sending NMI from CPU 0 to CPUs 1:

NMI backtrace for cpu 1

CPU: 1 PID: 7969 Comm: syz-executor809 Not tainted 4.19.37 #5

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011

RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x18/0x20 kernel/kcov.c:197
Code: 8b 4d 08 e8 ba fe ff ff 5d c3 0f 1f 84 00 00 00 00 00 55 48 89 f2 48
89 fe bf 07 00 00 00 48 89 e5 48 8b 4d 08 e8 98 fe ff ff <5d> c3 66 0f 1f
44 00 00 55 48 89 fa 48 89 e5 41 55 41 54 49 89 f4
RSP: 0018:ffff888091f47678 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffffea00021fa948 RCX: ffffffff818477ed
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007
RBP: ffff888091f47678 R08: ffff888095bae540 R09: 0000000000000001
R10: ffffed1015d24732 R11: ffff8880ae923993 R12: ffffea00021fa940
R13: ffffea00021fa940 R14: 0000000000000000 R15: ffffea00021fa848
FS: 00007f4ecc82c700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007f656d813000 CR3: 00000000946fc000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:

compound_head include/linux/page-flags.h:144 [inline]
PageLocked include/linux/page-flags.h:272 [inline]
unlock_page+0x8d/0x290 mm/filemap.c:1205
grow_dev_page fs/buffer.c:982 [inline]
grow_buffers fs/buffer.c:1017 [inline]
__getblk_slow fs/buffer.c:1044 [inline]
__getblk_gfp+0x638/0x970 fs/buffer.c:1321

__bread_gfp+0x2f/0x300 fs/buffer.c:1355
sb_bread include/linux/buffer_head.h:307 [inline]
udf_tread+0xf1/0x140 fs/udf/misc.c:44
udf_read_tagged+0x50/0x530 fs/udf/misc.c:210
udf_check_anchor_block+0x1ef/0x680 fs/udf/super.c:1755
udf_scan_anchors+0x3f4/0x680 fs/udf/super.c:1817
udf_find_anchor fs/udf/super.c:1852 [inline]
udf_load_vrs+0x67f/0xc80 fs/udf/super.c:1917
udf_fill_super+0x7cb/0x16f5 fs/udf/super.c:2112
mount_bdev+0x307/0x3c0 fs/super.c:1158
udf_mount+0x35/0x40 fs/udf/super.c:131
mount_fs+0xae/0x331 fs/super.c:1261
vfs_kern_mount.part.0+0x6f/0x410 fs/namespace.c:961
vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2469 [inline]
do_mount+0x53e/0x2bc0 fs/namespace.c:2799
ksys_mount+0xdb/0x150 fs/namespace.c:3015
__do_sys_mount fs/namespace.c:3029 [inline]
__se_sys_mount fs/namespace.c:3026 [inline]
__x64_sys_mount+0xbe/0x150 fs/namespace.c:3026
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe

RIP: 0033:0x44aeb9
Code: 5d ca fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7

48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff

ff 0f 83 2b ca fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f4ecc82bce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000006dcc48 RCX: 000000000044aeb9

RDX: 0000000020000240 RSI: 0000000020000200 RDI: 0000000020000080

RBP: 00000000006dcc40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc4c
R13: 00007ffee39c32bf R14: 00007f4ecc82c9c0 R15: 0000000000000001
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
kobject: 'loop4' (00000000730b524a): kobject_uevent_env
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
kobject: 'loop4' (00000000730b524a): fill_kobj_path: path
= '/devices/virtual/block/loop4'

syzbot

unread,

Apr 29, 2019, 7:24:06 PM4/29/19

to syzkaller...@googlegroups.com

syzbot has found a reproducer for the following crash on:

HEAD commit: fa5941f4 Linux 4.14.114
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=11d92df4a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=d7780000df8e070e

dashboard link: https://syzkaller.appspot.com/bug?extid=97f1a9334f246673a1cc
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11708924a00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10fdb3a8a00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+97f1a9...@syzkaller.appspotmail.com

print_req_error: I/O error, dev loop9, sector 512

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512

print_req_error: I/O error, dev loop11, sector 64

UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found

INFO: task syz-executor618:7124 blocked for more than 140 seconds.
kobject: 'loop4' (ffff8880a4aa7360): kobject_uevent_env

UDF-fs: Scanning with blocksize 512 failed

UDF-fs: Scanning with blocksize 512 failed
print_req_error: I/O error, dev loop7, sector 64

kobject: 'loop4' (ffff8880a4aa7360): fill_kobj_path: path
= '/devices/virtual/block/loop4'
Not tainted 4.14.114 #4

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

print_req_error: I/O error, dev loop9, sector 64

print_req_error: I/O error, dev loop11, sector 512
print_req_error: I/O error, dev loop7, sector 512
syz-executor618 D

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256

print_req_error: I/O error, dev loop9, sector 512
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,

location=256
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

kobject: 'loop3' (ffff8880a4a76a60): kobject_uevent_env
29256 7124 7081 0x00000004

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

Call Trace:
kobject: 'loop3' (ffff8880a4a76a60): fill_kobj_path: path
= '/devices/virtual/block/loop3'

UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7be/0x1cf0 kernel/sched/core.c:3383

UDF-fs: Scanning with blocksize 1024 failed

kobject: 'loop4' (ffff8880a4aa7360): kobject_uevent_env
kobject: 'loop5' (ffff8880a4b273e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a4aa7360): fill_kobj_path: path
= '/devices/virtual/block/loop4'

UDF-fs: Scanning with blocksize 1024 failed

UDF-fs: Scanning with blocksize 1024 failed
kobject: 'loop5' (ffff8880a4b273e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'

schedule+0x92/0x1c0 kernel/sched/core.c:3427
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:572 [inline]
rwsem_down_write_failed+0x5cd/0xbe0 kernel/locking/rwsem-xadd.c:601

kobject: 'loop4' (ffff8880a4aa7360): kobject_uevent_env
kobject: 'loop4' (ffff8880a4aa7360): fill_kobj_path: path
= '/devices/virtual/block/loop4'
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found

__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: Scanning with blocksize 2048 failed

grab_super+0x5e/0x140 fs/super.c:373

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

UDF-fs: Scanning with blocksize 2048 failed

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,

location=256
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: Scanning with blocksize 2048 failed

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found

sget_userns+0x2b3/0xc30 fs/super.c:504

UDF-fs: Scanning with blocksize 4096 failed

sget+0xd6/0x120 fs/super.c:572

UDF-fs: warning (device loop9): udf_fill_super: No partition found (1)

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,

location=512
UDF-fs: Scanning with blocksize 4096 failed

UDF-fs: warning (device loop11): udf_fill_super: No partition found (1)

mount_bdev+0xd5/0x370 fs/super.c:1107

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

UDF-fs: Scanning with blocksize 512 failed

UDF-fs: Scanning with blocksize 4096 failed

UDF-fs: warning (device loop7): udf_fill_super: No partition found (1)

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256

udf_mount+0x35/0x40 fs/udf/super.c:132
mount_fs+0x9d/0x2a7 fs/super.c:1237

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046
vfs_kern_mount fs/namespace.c:1036 [inline]
do_new_mount fs/namespace.c:2549 [inline]
do_mount+0x417/0x27d0 fs/namespace.c:2879

UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: Scanning with blocksize 512 failed

SYSC_mount fs/namespace.c:3095 [inline]
SyS_mount+0xab/0x120 fs/namespace.c:3072

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 512 failed

do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289

UDF-fs: Scanning with blocksize 1024 failed

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

entry_SYSCALL_64_after_hwframe+0x42/0xb7

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512

RIP: 0033:0x44aeb9
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found

UDF-fs: Scanning with blocksize 1024 failed
RSP: 002b:00007f00edb17ce8 EFLAGS: 00000246

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000006dcc48 RCX: 000000000044aeb9

RDX: 0000000020000240 RSI: 0000000020000200 RDI: 0000000020000080

UDF-fs: Scanning with blocksize 2048 failed

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: Scanning with blocksize 1024 failed

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256

RBP: 00000000006dcc40 R08: 0000000000000000 R09: 0000000000000000

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc4c

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: Scanning with blocksize 2048 failed

R13: 00007ffd2d25f55f R14: 00007f00edb189c0 R15: 0000000000000001

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found

INFO: task syz-executor618:7129 blocked for more than 140 seconds.

UDF-fs: Scanning with blocksize 2048 failed

UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

Not tainted 4.14.114 #4

UDF-fs: warning (device loop9): udf_fill_super: No partition found (1)

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

syz-executor618 D29424 7129 7079 0x00000004
Call Trace:

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

kobject: 'loop4' (ffff8880a4aa7360): kobject_uevent_env
kobject: 'loop4' (ffff8880a4aa7360): fill_kobj_path: path
= '/devices/virtual/block/loop4'

context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7be/0x1cf0 kernel/sched/core.c:3383

UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: Scanning with blocksize 4096 failed

UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: warning (device loop11): udf_fill_super: No partition found (1)

kobject: 'loop5' (ffff8880a4b273e0): kobject_uevent_env

UDF-fs: warning (device loop7): udf_fill_super: No partition found (1)

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
kobject: 'loop4' (ffff8880a4aa7360): kobject_uevent_env
kobject: 'loop5' (ffff8880a4b273e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop4' (ffff8880a4aa7360): fill_kobj_path: path
= '/devices/virtual/block/loop4'
schedule+0x92/0x1c0 kernel/sched/core.c:3427

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256

__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:572 [inline]
rwsem_down_write_failed+0x5cd/0xbe0 kernel/locking/rwsem-xadd.c:601

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

kobject: 'loop3' (ffff8880a4a76a60): kobject_uevent_env
UDF-fs: Scanning with blocksize 512 failed
kobject: 'loop4' (ffff8880a4aa7360): kobject_uevent_env
kobject: 'loop4' (ffff8880a4aa7360): fill_kobj_path: path
= '/devices/virtual/block/loop4'

UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

kobject: 'loop3' (ffff8880a4a76a60): fill_kobj_path: path

= '/devices/virtual/block/loop3'
UDF-fs: Scanning with blocksize 512 failed

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

kobject: 'loop4' (ffff8880a4aa7360): kobject_uevent_env

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,

location=512
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256

kobject: 'loop4' (ffff8880a4aa7360): fill_kobj_path: path
= '/devices/virtual/block/loop4'

UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 512 failed

kobject: 'loop4' (ffff8880a4aa7360): kobject_uevent_env
kobject: 'loop4' (ffff8880a4aa7360): fill_kobj_path: path
= '/devices/virtual/block/loop4'

__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56

UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

UDF-fs: Scanning with blocksize 1024 failed

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: Scanning with blocksize 1024 failed

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

grab_super+0x5e/0x140 fs/super.c:373
sget_userns+0x2b3/0xc30 fs/super.c:504

UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

kobject: 'loop4' (ffff8880a4aa7360): kobject_uevent_env
kobject: 'loop4' (ffff8880a4aa7360): fill_kobj_path: path
= '/devices/virtual/block/loop4'

UDF-fs: Scanning with blocksize 1024 failed
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256

kobject: 'loop5' (ffff8880a4b273e0): kobject_uevent_env

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

kobject: 'loop5' (ffff8880a4b273e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop3' (ffff8880a4a76a60): kobject_uevent_env

UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

sget+0xd6/0x120 fs/super.c:572
mount_bdev+0xd5/0x370 fs/super.c:1107

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

udf_mount+0x35/0x40 fs/udf/super.c:132
mount_fs+0x9d/0x2a7 fs/super.c:1237

UDF-fs: Scanning with blocksize 2048 failed

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046

UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found

kobject: 'loop3' (ffff8880a4a76a60): fill_kobj_path: path

= '/devices/virtual/block/loop3'
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

vfs_kern_mount fs/namespace.c:1036 [inline]
do_new_mount fs/namespace.c:2549 [inline]
do_mount+0x417/0x27d0 fs/namespace.c:2879

UDF-fs: Scanning with blocksize 2048 failed

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: Scanning with blocksize 4096 failed

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: warning (device loop11): udf_fill_super: No partition found (1)
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

SYSC_mount fs/namespace.c:3095 [inline]
SyS_mount+0xab/0x120 fs/namespace.c:3072

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 4096 failed

UDF-fs: Scanning with blocksize 4096 failed

UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
UDF-fs: warning (device loop7): udf_fill_super: No partition found (1)

UDF-fs: warning (device loop9): udf_fill_super: No partition found (1)

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289

UDF-fs: Scanning with blocksize 512 failed

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

UDF-fs: Scanning with blocksize 512 failed

entry_SYSCALL_64_after_hwframe+0x42/0xb7

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

UDF-fs: Scanning with blocksize 1024 failed
RIP: 0033:0x44aeb9

UDF-fs: Scanning with blocksize 512 failed
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

RSP: 002b:00007f00edaf6ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5

UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

UDF-fs: Scanning with blocksize 1024 failed

RAX: ffffffffffffffda RBX: 00000000006dcc58 RCX: 000000000044aeb9

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: Scanning with blocksize 2048 failed

RDX: 0000000020000240 RSI: 0000000020000200 RDI: 0000000020000080

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found

RBP: 00000000006dcc50 R08: 0000000000000000 R09: 0000000000000000

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: Scanning with blocksize 1024 failed

R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc5c

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

R13: 00007ffd2d25f55f R14: 00007f00edaf79c0 R15: 0000000000000001

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

UDF-fs: Scanning with blocksize 2048 failed

INFO: task syz-executor618:7163 blocked for more than 140 seconds.
Not tainted 4.14.114 #4

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: warning (device loop11): udf_fill_super: No partition found (1)

syz-executor618 D29744 7163 7080 0x00000004

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

Call Trace:
kobject: 'loop5' (ffff8880a4b273e0): kobject_uevent_env
kobject: 'loop5' (ffff8880a4b273e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'

UDF-fs: Scanning with blocksize 2048 failed

UDF-fs: Scanning with blocksize 4096 failed

context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7be/0x1cf0 kernel/sched/core.c:3383

UDF-fs: warning (device loop7): udf_fill_super: No partition found (1)

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256

kobject: 'loop3' (ffff8880a4a76a60): kobject_uevent_env
schedule+0x92/0x1c0 kernel/sched/core.c:3427

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

kobject: 'loop3' (ffff8880a4a76a60): fill_kobj_path: path
= '/devices/virtual/block/loop3'

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512

__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:572 [inline]
rwsem_down_write_failed+0x5cd/0xbe0 kernel/locking/rwsem-xadd.c:601

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: Scanning with blocksize 4096 failed

UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

UDF-fs: Scanning with blocksize 512 failed

UDF-fs: warning (device loop9): udf_fill_super: No partition found (1)
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: Scanning with blocksize 512 failed

__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

grab_super+0x5e/0x140 fs/super.c:373
kobject: 'loop5' (ffff8880a4b273e0): kobject_uevent_env

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512

kobject: 'loop5' (ffff8880a4b273e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'

UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

sget_userns+0x2b3/0xc30 fs/super.c:504

UDF-fs: Scanning with blocksize 1024 failed

kobject: 'loop4' (ffff8880a4aa7360): kobject_uevent_env
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
kobject: 'loop4' (ffff8880a4aa7360): kobject_uevent_env
kobject: 'loop4' (ffff8880a4aa7360): fill_kobj_path: path

= '/devices/virtual/block/loop4'
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: Scanning with blocksize 512 failed

kobject: 'loop4' (ffff8880a4aa7360): fill_kobj_path: path
= '/devices/virtual/block/loop4'

UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

sget+0xd6/0x120 fs/super.c:572

UDF-fs: Scanning with blocksize 1024 failed

kobject: 'loop3' (ffff8880a4a76a60): kobject_uevent_env
mount_bdev+0xd5/0x370 fs/super.c:1107
kobject: 'loop4' (ffff8880a4aa7360): kobject_uevent_env
kobject: 'loop4' (ffff8880a4aa7360): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop3' (ffff8880a4a76a60): fill_kobj_path: path
= '/devices/virtual/block/loop3'

udf_mount+0x35/0x40 fs/udf/super.c:132
mount_fs+0x9d/0x2a7 fs/super.c:1237

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256

kobject: 'loop4' (ffff8880a4aa7360): kobject_uevent_env

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512

vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046
vfs_kern_mount fs/namespace.c:1036 [inline]
do_new_mount fs/namespace.c:2549 [inline]
do_mount+0x417/0x27d0 fs/namespace.c:2879

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

kobject: 'loop4' (ffff8880a4aa7360): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop4' (ffff8880a4aa7360): kobject_uevent_env

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

kobject: 'loop4' (ffff8880a4aa7360): fill_kobj_path: path

= '/devices/virtual/block/loop4'
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found

UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

UDF-fs: Scanning with blocksize 1024 failed
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

SYSC_mount fs/namespace.c:3095 [inline]
SyS_mount+0xab/0x120 fs/namespace.c:3072

UDF-fs: Scanning with blocksize 2048 failed

kobject: 'loop4' (ffff8880a4aa7360): kobject_uevent_env
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
kobject: 'loop4' (ffff8880a4aa7360): fill_kobj_path: path

= '/devices/virtual/block/loop4'
UDF-fs: Scanning with blocksize 2048 failed

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 2048 failed

entry_SYSCALL_64_after_hwframe+0x42/0xb7

UDF-fs: Scanning with blocksize 4096 failed

UDF-fs: warning (device loop7): udf_fill_super: No partition found (1)
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: warning (device loop11): udf_fill_super: No partition found (1)
RIP: 0033:0x44aeb9

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256

RSP: 002b:00007f00edb17ce8 EFLAGS: 00000246
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
ORIG_RAX: 00000000000000a5

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

RAX: ffffffffffffffda RBX: 00000000006dcc48 RCX: 000000000044aeb9

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found

RDX: 0000000020000240 RSI: 0000000020000200 RDI: 0000000020000080

UDF-fs: Scanning with blocksize 512 failed

UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

UDF-fs: Scanning with blocksize 512 failed
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: Scanning with blocksize 4096 failed

RBP: 00000000006dcc40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc4c

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: warning (device loop9): udf_fill_super: No partition found (1)
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512

R13: 00007ffd2d25f55f R14: 00007f00edb189c0 R15: 0000000000000001

UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

Showing all locks held in the system:

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found

1 lock held by khungtaskd/1008:
#0: (tasklist_lock){.+.+}, at: [<ffffffff81487148>]
debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4541
1 lock held by rsyslogd/6931:

UDF-fs: Scanning with blocksize 1024 failed

#0: (&f->f_pos_lock){+.+.}, at: [<ffffffff81942e9b>]
__fdget_pos+0xab/0xd0 fs/file.c:769

UDF-fs: Scanning with blocksize 512 failed

2 locks held by getty/7053:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861af743>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310d3c6>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256

2 locks held by getty/7054:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861af743>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310d3c6>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7055:

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861af743>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310d3c6>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512

2 locks held by getty/7056:

#0:
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

(&tty->ldisc_sem){++++}, at: [<ffffffff861af743>]

ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock

UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

){+.+.}

UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

, at: [<ffffffff8310d3c6>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7057:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861af743>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found

&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310d3c6>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7058:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861af743>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377

UDF-fs: Scanning with blocksize 2048 failed

#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310d3c6>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7059:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861af743>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377

UDF-fs: Scanning with blocksize 1024 failed

#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310d3c6>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by syz-executor618/7124:
#0: (&bdev->bd_fsfreeze_mutex){+.+.}

UDF-fs: Scanning with blocksize 1024 failed

, at: [<ffffffff818e08f6>] mount_bdev+0x76/0x370 fs/super.c:1101
#1:

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256

(&type->s_umount_key#52){+.+.}, at: [<ffffffff818dedae>]
grab_super+0x5e/0x140 fs/super.c:373
2 locks held by syz-executor618/7129:
#0: (&bdev->bd_fsfreeze_mutex){+.+.}

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256

, at: [<ffffffff818e08f6>] mount_bdev+0x76/0x370 fs/super.c:1101

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

#1: (&type->s_umount_key#52){+.+.}, at: [<ffffffff818dedae>]
grab_super+0x5e/0x140 fs/super.c:373
2 locks held by syz-executor618/7163:
#0:

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

(&bdev->bd_fsfreeze_mutex){+.+.}, at: [<ffffffff818e08f6>]
mount_bdev+0x76/0x370 fs/super.c:1101
#1:
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
(&type->s_umount_key#52){+.+.}, at: [<ffffffff818dedae>]
grab_super+0x5e/0x140 fs/super.c:373

=============================================

UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: Scanning with blocksize 2048 failed

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found

UDF-fs: Scanning with blocksize 2048 failed
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: Scanning with blocksize 4096 failed

UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: warning (device loop11): udf_fill_super: No partition found (1)

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found

UDF-fs: warning (device loop7): udf_fill_super: No partition found (1)
UDF-fs: Scanning with blocksize 4096 failed
kobject: 'loop5' (ffff8880a4b273e0): kobject_uevent_env

UDF-fs: warning (device loop9): udf_fill_super: No partition found (1)

kobject: 'loop5' (ffff8880a4b273e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

kobject: 'loop3' (ffff8880a4a76a60): kobject_uevent_env

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

kobject: 'loop3' (ffff8880a4a76a60): fill_kobj_path: path
= '/devices/virtual/block/loop3'

UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

UDF-fs: Scanning with blocksize 512 failed

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512

kobject: 'loop4' (ffff8880a4aa7360): kobject_uevent_env
UDF-fs: Scanning with blocksize 512 failed
kobject: 'loop4' (ffff8880a4aa7360): kobject_uevent_env

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 512 failed

kobject: 'loop4' (ffff8880a4aa7360): fill_kobj_path: path

= '/devices/virtual/block/loop4'
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256

kobject: 'loop4' (ffff8880a4aa7360): fill_kobj_path: path

= '/devices/virtual/block/loop4'
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found

kobject: 'loop3' (ffff8880a4a76a60): kobject_uevent_env

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: Scanning with blocksize 1024 failed
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

UDF-fs: Scanning with blocksize 1024 failed

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

kobject: 'loop4' (ffff8880a4aa7360): kobject_uevent_env
kobject: 'loop4' (ffff8880a4aa7360): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop3' (ffff8880a4a76a60): fill_kobj_path: path
= '/devices/virtual/block/loop3'
print_req_error: 219 callbacks suppressed
print_req_error: I/O error, dev loop9, sector 1024

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

print_req_error: I/O error, dev loop9, sector 2048

kobject: 'loop4' (ffff8880a4aa7360): kobject_uevent_env
kobject: 'loop4' (ffff8880a4aa7360): fill_kobj_path: path
= '/devices/virtual/block/loop4'

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found

print_req_error: I/O error, dev loop11, sector 1024

UDF-fs: Scanning with blocksize 1024 failed
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: Scanning with blocksize 2048 failed

kobject: 'loop5' (ffff8880a4b273e0): kobject_uevent_env
print_req_error: I/O error, dev loop7, sector 64
print_req_error: I/O error, dev loop7, sector 1024

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256

kobject: 'loop5' (ffff8880a4b273e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'

print_req_error: I/O error, dev loop9, sector 64

print_req_error: I/O error, dev loop11, sector 2048

UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

kobject: 'loop4' (ffff8880a4aa7360): kobject_uevent_env
print_req_error: I/O error, dev loop7, sector 2048
kobject: 'loop4' (ffff8880a4aa7360): fill_kobj_path: path
= '/devices/virtual/block/loop4'

UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

print_req_error: I/O error, dev loop9, sector 2048

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

print_req_error: I/O error, dev loop9, sector 4096

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: Scanning with blocksize 2048 failed
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256,
location=256

UDF-fs: Scanning with blocksize 2048 failed

UDF-fs: Scanning with blocksize 4096 failed

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: warning (device loop9): udf_fill_super: No partition found (1)
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: warning (device loop11): udf_load_vrs: No anchor found

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256
UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512,
location=512

UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 512 failed

UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: warning (device loop11): udf_fill_super: No partition found (1)

UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256,
location=256

NMI backtrace for cpu 0

CPU: 0 PID: 1008 Comm: khungtaskd Not tainted 4.14.114 #4

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x138/0x19c lib/dump_stack.c:53
nmi_cpu_backtrace.cold+0x57/0x94 lib/nmi_backtrace.c:101

UDF-fs: Scanning with blocksize 4096 failed

nmi_trigger_cpumask_backtrace+0x141/0x189 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]

check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline]
watchdog+0x5e7/0xb90 kernel/hung_task.c:274
kthread+0x31c/0x430 kernel/kthread.c:232

UDF-fs: warning (device loop7): udf_fill_super: No partition found (1)

ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402
Sending NMI from CPU 0 to CPUs 1:

UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256,
location=256

NMI backtrace for cpu 1

CPU: 1 PID: 12000 Comm: syz-executor618 Not tainted 4.14.114 #4

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011

task: ffff8880989d2080 task.stack: ffff88809ea98000
RIP: 0010:pvclock_clocksource_read+0x17/0x4a0 arch/x86/kernel/pvclock.c:79
RSP: 0018:ffff8880aef07e70 EFLAGS: 00000802
RAX: 1ffff11043fff008 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff869d1e40 RDI: ffff88821fff8040
RBP: ffff8880aef07e78 R08: ffff8880989d2080 R09: 0000000000000002
R10: 0000000000000000 R11: ffff8880989d2080 R12: 000000ea4fce2fd6
R13: fffffbfff0ee296c R14: ffff8880aef25bb0 R15: 000000000001db00
FS: 00007f00edb18700(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000000000625208 CR3: 0000000094ee6000 CR4: 00000000001406e0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:

<IRQ>
kvm_clock_read+0x23/0x40 arch/x86/kernel/kvmclock.c:88
kvm_clock_get_cycles+0x9/0x10 arch/x86/kernel/kvmclock.c:95
tk_clock_read kernel/time/timekeeping.c:144 [inline]
timekeeping_get_delta kernel/time/timekeeping.c:238 [inline]
timekeeping_get_ns kernel/time/timekeeping.c:344 [inline]
ktime_get_update_offsets_now+0x163/0x3f0 kernel/time/timekeeping.c:2233
hrtimer_update_base kernel/time/hrtimer.c:505 [inline]
hrtimer_interrupt+0x131/0x5d0 kernel/time/hrtimer.c:1306
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline]
smp_apic_timer_interrupt+0x12c/0x600 arch/x86/kernel/apic/apic.c:1062
apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:787
</IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:778
[inline]
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1679 [inline]
RIP: 0010:vprintk_emit kernel/printk/printk.c:1916 [inline]
RIP: 0010:vprintk_emit+0x524/0x600 kernel/printk/printk.c:1882
RSP: 0018:ffff88809ea9f640 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff10
RAX: ffff8880989d2080 RBX: 1ffffffff0ee296d RCX: 1ffff1101313a524
RDX: 0000000000000000 RSI: ffff8880989d2900 RDI: 0000000000000297
RBP: ffff88809ea9f680 R08: ffff8880989d2080 R09: ffff8880989d2920
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000053
R13: 0000000000000297 R14: ffff8880a86ea4c0 R15: 0000000000000000
vprintk_default+0x28/0x30 kernel/printk/printk.c:1957
vprintk_func+0x5d/0x159 kernel/printk/printk_safe.c:401
printk+0x9e/0xbc kernel/printk/printk.c:1990
_udf_err+0xc9/0xe5 fs/udf/super.c:2308
udf_read_tagged+0x422/0x4b0 fs/udf/misc.c:212
udf_check_anchor_block+0x19b/0x580 fs/udf/super.c:1810
udf_scan_anchors+0x19b/0x5a0 fs/udf/super.c:1850

udf_find_anchor fs/udf/super.c:1907 [inline]
udf_load_vrs+0x5c4/0xae0 fs/udf/super.c:1972
udf_fill_super+0x727/0x157f fs/udf/super.c:2164
mount_bdev+0x2c1/0x370 fs/super.c:1134
udf_mount+0x35/0x40 fs/udf/super.c:132
mount_fs+0x9d/0x2a7 fs/super.c:1237
vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046
vfs_kern_mount fs/namespace.c:1036 [inline]
do_new_mount fs/namespace.c:2549 [inline]
do_mount+0x417/0x27d0 fs/namespace.c:2879
SYSC_mount fs/namespace.c:3095 [inline]
SyS_mount+0xab/0x120 fs/namespace.c:3072
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7

RIP: 0033:0x44aeb9
RSP: 002b:00007f00edb17ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000006dcc48 RCX: 000000000044aeb9

RDX: 0000000020000240 RSI: 0000000020000200 RDI: 0000000020000080

RBP: 00000000006dcc40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc4c
R13: 00007ffd2d25f55f R14: 00007f00edb189c0 R15: 0000000000000001
Code: 08 5e 00 e9 14 ff ff ff 66 90 66 2e 0f 1f 84 00 00 00 00 00 48 ba 00
00 00 00 00 fc ff df 55 48 89 f8 48 89 e5 48 c1 e8 03 41 57 <41> 56 41 55
4c 8d 6f 03 41 54 4c 89 e9 53 48 c1 e9 03 48 89 fb

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