[syzbot] [exfat?] INFO: task hung in do_new_mount (2)
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syzbot
Mar 21, 2024, 10:06:29 AMMar 21
to linki...@kernel.org, linux-...@vger.kernel.org, linux-...@vger.kernel.org, sj155...@samsung.com, syzkall...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: fe46a7dd189e Merge tag 'sound-6.9-rc1' of git://git.kernel..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=156b7946180000
kernel config: https://syzkaller.appspot.com/x/.config?x=4d90a36f0cab495a
dashboard link: https://syzkaller.appspot.com/bug?extid=f59c2feaf7cb5988e877
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1075d2c9180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=161012a5180000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f6c04726a2ae/disk-fe46a7dd.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/09c26ce901ea/vmlinux-fe46a7dd.xz
kernel image: https://storage.googleapis.com/syzbot-assets/134acf7f5322/bzImage-fe46a7dd.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/8eeb4ed4feec/mount_2.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f59c2f...@syzkaller.appspotmail.com
INFO: task syz-executor238:5068 blocked for more than 143 seconds.
Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor238 state:D stack:25616 pid:5068 tgid:5068 ppid:5063 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5409 [inline]
__schedule+0x1781/0x49d0 kernel/sched/core.c:6736
__schedule_loop kernel/sched/core.c:6813 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6828
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6885
rwsem_down_write_slowpath+0xeeb/0x13b0 kernel/locking/rwsem.c:1178
__down_write_common+0x1af/0x200 kernel/locking/rwsem.c:1306
inode_lock include/linux/fs.h:793 [inline]
do_lock_mount+0x112/0x3a0 fs/namespace.c:2460
lock_mount fs/namespace.c:2502 [inline]
do_new_mount_fc fs/namespace.c:3289 [inline]
do_new_mount+0x43d/0xb40 fs/namespace.c:3354
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
do_syscall_64+0xfb/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f180bc1f26a
RSP: 002b:00007ffce5f8f508 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffce5f8f520 RCX: 00007f180bc1f26a
RDX: 0000000020001500 RSI: 0000000020000140 RDI: 00007ffce5f8f520
RBP: 0000000000000005 R08: 00007ffce5f8f560 R09: 00000000000014f8
R10: 0000000000000800 R11: 0000000000000286 R12: 0000000000000800
R13: 00007ffce5f8f560 R14: 0000000000000004 R15: 0000000000020000
</TASK>
INFO: task syz-executor238:5071 blocked for more than 143 seconds.
Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor238 state:D stack:25336 pid:5071 tgid:5071 ppid:5066 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5409 [inline]
__schedule+0x1781/0x49d0 kernel/sched/core.c:6736
__schedule_loop kernel/sched/core.c:6813 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6828
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6885
rwsem_down_write_slowpath+0xeeb/0x13b0 kernel/locking/rwsem.c:1178
__down_write_common+0x1af/0x200 kernel/locking/rwsem.c:1306
inode_lock include/linux/fs.h:793 [inline]
do_lock_mount+0x112/0x3a0 fs/namespace.c:2460
lock_mount fs/namespace.c:2502 [inline]
do_new_mount_fc fs/namespace.c:3289 [inline]
do_new_mount+0x43d/0xb40 fs/namespace.c:3354
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
do_syscall_64+0xfb/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f180bc1f26a
RSP: 002b:00007ffce5f8f508 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffce5f8f520 RCX: 00007f180bc1f26a
RDX: 0000000020001500 RSI: 0000000020000140 RDI: 00007ffce5f8f520
RBP: 0000000000000005 R08: 00007ffce5f8f560 R09: 00000000000014f8
R10: 0000000000000800 R11: 0000000000000286 R12: 0000000000000800
R13: 00007ffce5f8f560 R14: 0000000000000004 R15: 0000000000020000
</TASK>
INFO: task syz-executor238:5073 blocked for more than 143 seconds.
Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor238 state:D stack:25456 pid:5073 tgid:5073 ppid:5069 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5409 [inline]
__schedule+0x1781/0x49d0 kernel/sched/core.c:6736
__schedule_loop kernel/sched/core.c:6813 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6828
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6885
rwsem_down_write_slowpath+0xeeb/0x13b0 kernel/locking/rwsem.c:1178
__down_write_common+0x1af/0x200 kernel/locking/rwsem.c:1306
inode_lock include/linux/fs.h:793 [inline]
do_lock_mount+0x112/0x3a0 fs/namespace.c:2460
lock_mount fs/namespace.c:2502 [inline]
do_new_mount_fc fs/namespace.c:3289 [inline]
do_new_mount+0x43d/0xb40 fs/namespace.c:3354
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
do_syscall_64+0xfb/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f180bc1f26a
RSP: 002b:00007ffce5f8f508 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffce5f8f520 RCX: 00007f180bc1f26a
RDX: 0000000020001500 RSI: 0000000020000140 RDI: 00007ffce5f8f520
RBP: 0000000000000005 R08: 00007ffce5f8f560 R09: 00000000000014f8
R10: 0000000000000800 R11: 0000000000000286 R12: 0000000000000800
R13: 00007ffce5f8f560 R14: 0000000000000004 R15: 0000000000020000
</TASK>
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#0: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#0: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by getty/4822:
#0: ffff88802a7690a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201
1 lock held by syz-executor238/5068:
#0: ffff88807b2a02b8 (&sb->s_type->i_mutex_key#14){++++}-{3:3}, at: inode_lock include/linux/fs.h:793 [inline]
#0: ffff88807b2a02b8 (&sb->s_type->i_mutex_key#14){++++}-{3:3}, at: do_lock_mount+0x112/0x3a0 fs/namespace.c:2460
3 locks held by syz-executor238/5072:
1 lock held by syz-executor238/5071:
#0: ffff88807b2a02b8 (&sb->s_type->i_mutex_key#14){++++}-{3:3}, at: inode_lock include/linux/fs.h:793 [inline]
#0: ffff88807b2a02b8 (&sb->s_type->i_mutex_key#14){++++}-{3:3}, at: do_lock_mount+0x112/0x3a0 fs/namespace.c:2460
1 lock held by syz-executor238/5073:
#0: ffff88807b2a02b8 (&sb->s_type->i_mutex_key#14){++++}-{3:3}, at: inode_lock include/linux/fs.h:793 [inline]
#0: ffff88807b2a02b8 (&sb->s_type->i_mutex_key#14){++++}-{3:3}, at: do_lock_mount+0x112/0x3a0 fs/namespace.c:2460
2 locks held by syz-executor238/5141:
#0: ffff88801ff6efc8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x259/0x320 fs/file.c:1191
#1: ffff88807b2a02b8 (&sb->s_type->i_mutex_key#14){++++}-{3:3}, at: iterate_dir+0x436/0x6f0 fs/readdir.c:103
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xfb0/0xff0 kernel/hung_task.c:379
kthread+0x2f0/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5072 Comm: syz-executor238 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:__sanitizer_cov_trace_cmp8+0x7d/0x90 kernel/kcov.c:285
Code: c1 e1 05 48 8d 41 28 4c 39 c8 77 1e 49 ff c2 4c 89 12 48 c7 44 11 08 06 00 00 00 48 89 7c 11 10 48 89 74 11 18 4c 89 44 11 20 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90
RSP: 0018:ffffc90004277398 EFLAGS: 00000093
RAX: 0000000000000000 RBX: 00000000000000a0 RCX: ffff888011465a00
RDX: ffff888011465a00 RSI: 00000000000000a0 RDI: 0000000000000080
RBP: ffffc900042774e0 R08: ffffffff8217736e R09: 1ffffffff289d8e4
R10: dffffc0000000000 R11: fffffbfff289d8e5 R12: ffff88807b1262b8
R13: 0000000000039030 R14: 0000000000000000 R15: 0000000000000080
FS: 00005555679ce380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f180361f000 CR3: 000000007721e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<TASK>
lookup_bh_lru fs/buffer.c:1370 [inline]
__find_get_block+0x46e/0x10d0 fs/buffer.c:1397
bdev_getblk+0x38/0x610 fs/buffer.c:1423
__bread_gfp+0xac/0x430 fs/buffer.c:1474
sb_bread include/linux/buffer_head.h:321 [inline]
exfat_get_dentry+0x53b/0x730 fs/exfat/dir.c:770
exfat_readdir fs/exfat/dir.c:121 [inline]
exfat_iterate+0xbd7/0x33e0 fs/exfat/dir.c:261
wrap_directory_iterator+0x94/0xe0 fs/readdir.c:67
iterate_dir+0x539/0x6f0 fs/readdir.c:110
__do_sys_getdents64 fs/readdir.c:409 [inline]
__se_sys_getdents64+0x20d/0x4f0 fs/readdir.c:394
do_syscall_64+0xfb/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f180bc1ded9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffce5f8f698 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f180bc67082 RCX: 00007f180bc1ded9
RDX: 0000000000000646 RSI: 0000000020000240 RDI: 0000000000000005
RBP: 0030656c69662f2e R08: 00005555679cf378 R09: 00005555679cf378
R10: 00000000000014f8 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffce5f8f6d0 R14: 00007ffce5f8f6bc R15: 00007f180bc6703b
</TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.453 msecs
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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If the report is already addressed, let syzbot know by replying with:
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If you want syzbot to run the reproducer, reply with:
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If you want to overwrite report's subsystems, reply with:
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If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: fe46a7dd189e Merge tag 'sound-6.9-rc1' of git://git.kernel..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=156b7946180000
kernel config: https://syzkaller.appspot.com/x/.config?x=4d90a36f0cab495a
dashboard link: https://syzkaller.appspot.com/bug?extid=f59c2feaf7cb5988e877
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1075d2c9180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=161012a5180000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f6c04726a2ae/disk-fe46a7dd.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/09c26ce901ea/vmlinux-fe46a7dd.xz
kernel image: https://storage.googleapis.com/syzbot-assets/134acf7f5322/bzImage-fe46a7dd.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/8eeb4ed4feec/mount_2.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f59c2f...@syzkaller.appspotmail.com
INFO: task syz-executor238:5068 blocked for more than 143 seconds.
Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor238 state:D stack:25616 pid:5068 tgid:5068 ppid:5063 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5409 [inline]
__schedule+0x1781/0x49d0 kernel/sched/core.c:6736
__schedule_loop kernel/sched/core.c:6813 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6828
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6885
rwsem_down_write_slowpath+0xeeb/0x13b0 kernel/locking/rwsem.c:1178
__down_write_common+0x1af/0x200 kernel/locking/rwsem.c:1306
inode_lock include/linux/fs.h:793 [inline]
do_lock_mount+0x112/0x3a0 fs/namespace.c:2460
lock_mount fs/namespace.c:2502 [inline]
do_new_mount_fc fs/namespace.c:3289 [inline]
do_new_mount+0x43d/0xb40 fs/namespace.c:3354
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
do_syscall_64+0xfb/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f180bc1f26a
RSP: 002b:00007ffce5f8f508 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffce5f8f520 RCX: 00007f180bc1f26a
RDX: 0000000020001500 RSI: 0000000020000140 RDI: 00007ffce5f8f520
RBP: 0000000000000005 R08: 00007ffce5f8f560 R09: 00000000000014f8
R10: 0000000000000800 R11: 0000000000000286 R12: 0000000000000800
R13: 00007ffce5f8f560 R14: 0000000000000004 R15: 0000000000020000
</TASK>
INFO: task syz-executor238:5071 blocked for more than 143 seconds.
Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor238 state:D stack:25336 pid:5071 tgid:5071 ppid:5066 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5409 [inline]
__schedule+0x1781/0x49d0 kernel/sched/core.c:6736
__schedule_loop kernel/sched/core.c:6813 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6828
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6885
rwsem_down_write_slowpath+0xeeb/0x13b0 kernel/locking/rwsem.c:1178
__down_write_common+0x1af/0x200 kernel/locking/rwsem.c:1306
inode_lock include/linux/fs.h:793 [inline]
do_lock_mount+0x112/0x3a0 fs/namespace.c:2460
lock_mount fs/namespace.c:2502 [inline]
do_new_mount_fc fs/namespace.c:3289 [inline]
do_new_mount+0x43d/0xb40 fs/namespace.c:3354
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
do_syscall_64+0xfb/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f180bc1f26a
RSP: 002b:00007ffce5f8f508 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffce5f8f520 RCX: 00007f180bc1f26a
RDX: 0000000020001500 RSI: 0000000020000140 RDI: 00007ffce5f8f520
RBP: 0000000000000005 R08: 00007ffce5f8f560 R09: 00000000000014f8
R10: 0000000000000800 R11: 0000000000000286 R12: 0000000000000800
R13: 00007ffce5f8f560 R14: 0000000000000004 R15: 0000000000020000
</TASK>
INFO: task syz-executor238:5073 blocked for more than 143 seconds.
Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor238 state:D stack:25456 pid:5073 tgid:5073 ppid:5069 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5409 [inline]
__schedule+0x1781/0x49d0 kernel/sched/core.c:6736
__schedule_loop kernel/sched/core.c:6813 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6828
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6885
rwsem_down_write_slowpath+0xeeb/0x13b0 kernel/locking/rwsem.c:1178
__down_write_common+0x1af/0x200 kernel/locking/rwsem.c:1306
inode_lock include/linux/fs.h:793 [inline]
do_lock_mount+0x112/0x3a0 fs/namespace.c:2460
lock_mount fs/namespace.c:2502 [inline]
do_new_mount_fc fs/namespace.c:3289 [inline]
do_new_mount+0x43d/0xb40 fs/namespace.c:3354
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
do_syscall_64+0xfb/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f180bc1f26a
RSP: 002b:00007ffce5f8f508 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffce5f8f520 RCX: 00007f180bc1f26a
RDX: 0000000020001500 RSI: 0000000020000140 RDI: 00007ffce5f8f520
RBP: 0000000000000005 R08: 00007ffce5f8f560 R09: 00000000000014f8
R10: 0000000000000800 R11: 0000000000000286 R12: 0000000000000800
R13: 00007ffce5f8f560 R14: 0000000000000004 R15: 0000000000020000
</TASK>
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#0: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#0: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by getty/4822:
#0: ffff88802a7690a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201
1 lock held by syz-executor238/5068:
#0: ffff88807b2a02b8 (&sb->s_type->i_mutex_key#14){++++}-{3:3}, at: inode_lock include/linux/fs.h:793 [inline]
#0: ffff88807b2a02b8 (&sb->s_type->i_mutex_key#14){++++}-{3:3}, at: do_lock_mount+0x112/0x3a0 fs/namespace.c:2460
3 locks held by syz-executor238/5072:
1 lock held by syz-executor238/5071:
#0: ffff88807b2a02b8 (&sb->s_type->i_mutex_key#14){++++}-{3:3}, at: inode_lock include/linux/fs.h:793 [inline]
#0: ffff88807b2a02b8 (&sb->s_type->i_mutex_key#14){++++}-{3:3}, at: do_lock_mount+0x112/0x3a0 fs/namespace.c:2460
1 lock held by syz-executor238/5073:
#0: ffff88807b2a02b8 (&sb->s_type->i_mutex_key#14){++++}-{3:3}, at: inode_lock include/linux/fs.h:793 [inline]
#0: ffff88807b2a02b8 (&sb->s_type->i_mutex_key#14){++++}-{3:3}, at: do_lock_mount+0x112/0x3a0 fs/namespace.c:2460
2 locks held by syz-executor238/5141:
#0: ffff88801ff6efc8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x259/0x320 fs/file.c:1191
#1: ffff88807b2a02b8 (&sb->s_type->i_mutex_key#14){++++}-{3:3}, at: iterate_dir+0x436/0x6f0 fs/readdir.c:103
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xfb0/0xff0 kernel/hung_task.c:379
kthread+0x2f0/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5072 Comm: syz-executor238 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:__sanitizer_cov_trace_cmp8+0x7d/0x90 kernel/kcov.c:285
Code: c1 e1 05 48 8d 41 28 4c 39 c8 77 1e 49 ff c2 4c 89 12 48 c7 44 11 08 06 00 00 00 48 89 7c 11 10 48 89 74 11 18 4c 89 44 11 20 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90
RSP: 0018:ffffc90004277398 EFLAGS: 00000093
RAX: 0000000000000000 RBX: 00000000000000a0 RCX: ffff888011465a00
RDX: ffff888011465a00 RSI: 00000000000000a0 RDI: 0000000000000080
RBP: ffffc900042774e0 R08: ffffffff8217736e R09: 1ffffffff289d8e4
R10: dffffc0000000000 R11: fffffbfff289d8e5 R12: ffff88807b1262b8
R13: 0000000000039030 R14: 0000000000000000 R15: 0000000000000080
FS: 00005555679ce380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f180361f000 CR3: 000000007721e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<TASK>
lookup_bh_lru fs/buffer.c:1370 [inline]
__find_get_block+0x46e/0x10d0 fs/buffer.c:1397
bdev_getblk+0x38/0x610 fs/buffer.c:1423
__bread_gfp+0xac/0x430 fs/buffer.c:1474
sb_bread include/linux/buffer_head.h:321 [inline]
exfat_get_dentry+0x53b/0x730 fs/exfat/dir.c:770
exfat_readdir fs/exfat/dir.c:121 [inline]
exfat_iterate+0xbd7/0x33e0 fs/exfat/dir.c:261
wrap_directory_iterator+0x94/0xe0 fs/readdir.c:67
iterate_dir+0x539/0x6f0 fs/readdir.c:110
__do_sys_getdents64 fs/readdir.c:409 [inline]
__se_sys_getdents64+0x20d/0x4f0 fs/readdir.c:394
do_syscall_64+0xfb/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f180bc1ded9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffce5f8f698 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f180bc67082 RCX: 00007f180bc1ded9
RDX: 0000000000000646 RSI: 0000000020000240 RDI: 0000000000000005
RBP: 0030656c69662f2e R08: 00005555679cf378 R09: 00005555679cf378
R10: 00000000000014f8 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffce5f8f6d0 R14: 00007ffce5f8f6bc R15: 00007f180bc6703b
</TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.453 msecs
---
This report is generated by a bot. It may contain errors.
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If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite report's subsystems, reply with:
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If you want to undo deduplication, reply with:
#syz undup
Edward Adam Davis
Mar 24, 2024, 2:33:27 AMMar 24
to syzbot+f59c2f...@syzkaller.appspotmail.com, linux-...@vger.kernel.org, syzkall...@googlegroups.com
please test hung in do_new_mount
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 0a2c2baafa31
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 0a2c2baafa31
syzbot
Mar 24, 2024, 3:02:04 AMMar 24
to ead...@qq.com, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
INFO: task hung in __fdget_pos
INFO: task syz-executor.2:5529 blocked for more than 143 seconds.
Not tainted 6.5.0-rc4-syzkaller-00229-g0a2c2baafa31 #0
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x187f/0x4970 kernel/sched/core.c:6710
schedule+0xc3/0x180 kernel/sched/core.c:6786
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6845
__mutex_lock_common+0xe6b/0x2380 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:799
__fdget_pos+0x2c1/0x370 fs/file.c:1062
fdget_pos include/linux/file.h:74 [inline]
__do_sys_getdents64 fs/readdir.c:365 [inline]
__se_sys_getdents64+0x1dc/0x4f0 fs/readdir.c:354
do_syscall_64+0x46/0xc0
entry_SYSCALL_64_after_hwframe+0x6f/0xd9
RIP: 0033:0x7f7b1747dda9
RSP: 002b:00007f7b1812d0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f7b175ac050 RCX: 00007f7b1747dda9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007f7b174ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f7b175ac050 R15: 00007ffe0719f878
</TASK>
INFO: task syz-executor.1:5544 blocked for more than 144 seconds.
Not tainted 6.5.0-rc4-syzkaller-00229-g0a2c2baafa31 #0
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x187f/0x4970 kernel/sched/core.c:6710
schedule+0xc3/0x180 kernel/sched/core.c:6786
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6845
__mutex_lock_common+0xe6b/0x2380 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:799
__fdget_pos+0x2c1/0x370 fs/file.c:1062
fdget_pos include/linux/file.h:74 [inline]
__do_sys_getdents64 fs/readdir.c:365 [inline]
__se_sys_getdents64+0x1dc/0x4f0 fs/readdir.c:354
do_syscall_64+0x46/0xc0
entry_SYSCALL_64_after_hwframe+0x6f/0xd9
RIP: 0033:0x7f85ae47dda9
RSP: 002b:00007f85ad7fe0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f85ae5ac050 RCX: 00007f85ae47dda9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007f85ae4ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f85ae5ac050 R15: 00007fff4f482218
</TASK>
INFO: task syz-executor.4:5547 blocked for more than 145 seconds.
Not tainted 6.5.0-rc4-syzkaller-00229-g0a2c2baafa31 #0
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x187f/0x4970 kernel/sched/core.c:6710
schedule+0xc3/0x180 kernel/sched/core.c:6786
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6845
__mutex_lock_common+0xe6b/0x2380 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:799
__fdget_pos+0x2c1/0x370 fs/file.c:1062
fdget_pos include/linux/file.h:74 [inline]
__do_sys_getdents64 fs/readdir.c:365 [inline]
__se_sys_getdents64+0x1dc/0x4f0 fs/readdir.c:354
do_syscall_64+0x46/0xc0
entry_SYSCALL_64_after_hwframe+0x6f/0xd9
RIP: 0033:0x7f3a6fa7dda9
RSP: 002b:00007f3a707b90c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f3a6fbac050 RCX: 00007f3a6fa7dda9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007f3a6faca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f3a6fbac050 R15: 00007ffc33ae2ae8
</TASK>
INFO: task syz-executor.3:5555 blocked for more than 146 seconds.
Not tainted 6.5.0-rc4-syzkaller-00229-g0a2c2baafa31 #0
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x187f/0x4970 kernel/sched/core.c:6710
schedule+0xc3/0x180 kernel/sched/core.c:6786
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6845
__mutex_lock_common+0xe6b/0x2380 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:799
__fdget_pos+0x2c1/0x370 fs/file.c:1062
fdget_pos include/linux/file.h:74 [inline]
__do_sys_getdents64 fs/readdir.c:365 [inline]
__se_sys_getdents64+0x1dc/0x4f0 fs/readdir.c:354
do_syscall_64+0x46/0xc0
entry_SYSCALL_64_after_hwframe+0x6f/0xd9
RIP: 0033:0x7fc6b007dda9
RSP: 002b:00007fc6b0e5c0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007fc6b01ac050 RCX: 00007fc6b007dda9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007fc6b00ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fc6b01ac050 R15: 00007fff5c668248
</TASK>
INFO: task syz-executor.0:5556 blocked for more than 146 seconds.
Not tainted 6.5.0-rc4-syzkaller-00229-g0a2c2baafa31 #0
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x187f/0x4970 kernel/sched/core.c:6710
schedule+0xc3/0x180 kernel/sched/core.c:6786
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6845
__mutex_lock_common+0xe6b/0x2380 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:799
__fdget_pos+0x2c1/0x370 fs/file.c:1062
fdget_pos include/linux/file.h:74 [inline]
__do_sys_getdents64 fs/readdir.c:365 [inline]
__se_sys_getdents64+0x1dc/0x4f0 fs/readdir.c:354
do_syscall_64+0x46/0xc0
entry_SYSCALL_64_after_hwframe+0x6f/0xd9
RIP: 0033:0x7ff50387dda9
RSP: 002b:00007ff5045a70c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007ff5039ac050 RCX: 00007ff50387dda9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007ff5038ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007ff5039ac050 R15: 00007ffeb4f70208
#0: ffffffff8d72b470 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd30 kernel/rcu/tasks.h:522
1 lock held by rcu_tasks_trace/14:
#0: ffffffff8d72b830 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd30 kernel/rcu/tasks.h:522
1 lock held by khungtaskd/28:
#0: ffffffff8d72b2a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by kworker/u4:2/29:
1 lock held by udevd/4478:
2 locks held by getty/4775:
#0: ffff88814b316098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc900015902f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b1/0x1dc0 drivers/tty/n_tty.c:2187
3 locks held by syz-executor.2/5525:
1 lock held by syz-executor.2/5529:
#0: ffff88802ba85c48 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2c1/0x370 fs/file.c:1062
3 locks held by syz-executor.1/5537:
1 lock held by syz-executor.1/5544:
#0: ffff88802bd45248 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2c1/0x370 fs/file.c:1062
3 locks held by syz-executor.4/5541:
1 lock held by syz-executor.4/5547:
#0: ffff8880294525c8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2c1/0x370 fs/file.c:1062
3 locks held by syz-executor.3/5550:
1 lock held by syz-executor.3/5555:
#0: ffff88802d6f8348 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2c1/0x370 fs/file.c:1062
3 locks held by syz-executor.0/5552:
1 lock held by syz-executor.0/5556:
#0: ffff88802288a848 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2c1/0x370 fs/file.c:1062
1 lock held by syz-executor.1/5838:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.5.0-rc4-syzkaller-00229-g0a2c2baafa31 #0
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x187/0x310 lib/nmi_backtrace.c:62
kthread+0x2ec/0x390 kernel/kthread.c:389
ret_from_fork+0x32/0x60 arch/x86/kernel/process.c:145
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:304
</TASK>
Sending NMI from CPU 1 to CPUs 0:
RIP: 0010:smk_tskacc+0x223/0x360 security/smack/smack_access.c:234
Code: e8 12 bb ee fd 49 8b 36 bf 20 00 00 00 e8 75 1b 00 00 84 c0 74 1e e8 dc 4b 94 fd e9 81 00 00 00 e8 d2 4b 94 fd 45 31 e4 eb 77 <e8> c8 4b 94 fd 45 31 e4 eb 6d e8 be 4b 94 fd 45 89 ec eb 63 48 83
RSP: 0018:ffffc9000392f648 EFLAGS: 00000246
RAX: 1ffff11005d742c4 RBX: ffffffff8dd06320 RCX: ffff88801ab8bb80
RDX: ffff88801ab8bb80 RSI: 0000000000000000 RDI: 00000000ffffffff
RBP: ffff88802eba1620 R08: ffffffff83fbda6b R09: 0000000000000000
R10: ffffc9000392f708 R11: fffff52000725ee5 R12: ffffffff8b7195c0
R13: ffffffff8b7195c0 R14: ffff88802eba1620 R15: dffffc0000000000
FS: 00007fa55a5076c0(0000) GS:ffff8880b9600000(0000) knlGS:0000000000000000
security_inode_permission+0xa5/0x100 security/security.c:2072
may_lookup fs/namei.c:1720 [inline]
link_path_walk+0x2da/0xe80 fs/namei.c:2267
path_openat+0x249/0x31e0 fs/namei.c:3789
do_filp_open+0x234/0x490 fs/namei.c:3820
do_sys_openat2+0x13e/0x1d0 fs/open.c:1407
do_sys_open fs/open.c:1422 [inline]
__do_sys_openat fs/open.c:1438 [inline]
__se_sys_openat fs/open.c:1433 [inline]
__x64_sys_openat+0x247/0x2a0 fs/open.c:1433
do_syscall_64+0x46/0xc0
entry_SYSCALL_64_after_hwframe+0x6f/0xd9
RIP: 0033:0x7fa55987c9a0
Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 09 82 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 5c 82 02 00 8b 44
RSP: 002b:00007fa55a506e30 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fa55987c9a0
RDX: 0000000000000002 RSI: 00007fa55a506f40 RDI: 00000000ffffff9c
RBP: 00007fa55a506f40 R08: 0000000000000000 R09: 00000000000014f8
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000004
R13: 00007fa55a506f80 R14: 00007fa55a506f40 R15: 00007fa5507ff000
</TASK>
Tested on:
commit: 0a2c2baa proc: fix missing conversion to 'iterate_shar..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=116e4711180000
kernel config: https://syzkaller.appspot.com/x/.config?x=52460339570262b2
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
INFO: task hung in __fdget_pos
INFO: task syz-executor.2:5529 blocked for more than 143 seconds.
Not tainted 6.5.0-rc4-syzkaller-00229-g0a2c2baafa31 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack:28792 pid:5529 ppid:5388 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x187f/0x4970 kernel/sched/core.c:6710
schedule+0xc3/0x180 kernel/sched/core.c:6786
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6845
__mutex_lock_common+0xe6b/0x2380 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:799
__fdget_pos+0x2c1/0x370 fs/file.c:1062
fdget_pos include/linux/file.h:74 [inline]
__do_sys_getdents64 fs/readdir.c:365 [inline]
__se_sys_getdents64+0x1dc/0x4f0 fs/readdir.c:354
do_syscall_64+0x46/0xc0
entry_SYSCALL_64_after_hwframe+0x6f/0xd9
RIP: 0033:0x7f7b1747dda9
RSP: 002b:00007f7b1812d0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f7b175ac050 RCX: 00007f7b1747dda9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007f7b174ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f7b175ac050 R15: 00007ffe0719f878
</TASK>
INFO: task syz-executor.1:5544 blocked for more than 144 seconds.
Not tainted 6.5.0-rc4-syzkaller-00229-g0a2c2baafa31 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1 state:D stack:29360 pid:5544 ppid:5389 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x187f/0x4970 kernel/sched/core.c:6710
schedule+0xc3/0x180 kernel/sched/core.c:6786
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6845
__mutex_lock_common+0xe6b/0x2380 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:799
__fdget_pos+0x2c1/0x370 fs/file.c:1062
fdget_pos include/linux/file.h:74 [inline]
__do_sys_getdents64 fs/readdir.c:365 [inline]
__se_sys_getdents64+0x1dc/0x4f0 fs/readdir.c:354
do_syscall_64+0x46/0xc0
entry_SYSCALL_64_after_hwframe+0x6f/0xd9
RIP: 0033:0x7f85ae47dda9
RSP: 002b:00007f85ad7fe0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f85ae5ac050 RCX: 00007f85ae47dda9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007f85ae4ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f85ae5ac050 R15: 00007fff4f482218
</TASK>
INFO: task syz-executor.4:5547 blocked for more than 145 seconds.
Not tainted 6.5.0-rc4-syzkaller-00229-g0a2c2baafa31 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4 state:D stack:29360 pid:5547 ppid:5394 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x187f/0x4970 kernel/sched/core.c:6710
schedule+0xc3/0x180 kernel/sched/core.c:6786
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6845
__mutex_lock_common+0xe6b/0x2380 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:799
__fdget_pos+0x2c1/0x370 fs/file.c:1062
fdget_pos include/linux/file.h:74 [inline]
__do_sys_getdents64 fs/readdir.c:365 [inline]
__se_sys_getdents64+0x1dc/0x4f0 fs/readdir.c:354
do_syscall_64+0x46/0xc0
entry_SYSCALL_64_after_hwframe+0x6f/0xd9
RIP: 0033:0x7f3a6fa7dda9
RSP: 002b:00007f3a707b90c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f3a6fbac050 RCX: 00007f3a6fa7dda9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007f3a6faca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f3a6fbac050 R15: 00007ffc33ae2ae8
</TASK>
INFO: task syz-executor.3:5555 blocked for more than 146 seconds.
Not tainted 6.5.0-rc4-syzkaller-00229-g0a2c2baafa31 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3 state:D stack:29360 pid:5555 ppid:5387 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x187f/0x4970 kernel/sched/core.c:6710
schedule+0xc3/0x180 kernel/sched/core.c:6786
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6845
__mutex_lock_common+0xe6b/0x2380 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:799
__fdget_pos+0x2c1/0x370 fs/file.c:1062
fdget_pos include/linux/file.h:74 [inline]
__do_sys_getdents64 fs/readdir.c:365 [inline]
__se_sys_getdents64+0x1dc/0x4f0 fs/readdir.c:354
do_syscall_64+0x46/0xc0
entry_SYSCALL_64_after_hwframe+0x6f/0xd9
RIP: 0033:0x7fc6b007dda9
RSP: 002b:00007fc6b0e5c0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007fc6b01ac050 RCX: 00007fc6b007dda9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007fc6b00ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fc6b01ac050 R15: 00007fff5c668248
</TASK>
INFO: task syz-executor.0:5556 blocked for more than 146 seconds.
Not tainted 6.5.0-rc4-syzkaller-00229-g0a2c2baafa31 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:29360 pid:5556 ppid:5393 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x187f/0x4970 kernel/sched/core.c:6710
schedule+0xc3/0x180 kernel/sched/core.c:6786
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6845
__mutex_lock_common+0xe6b/0x2380 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:799
__fdget_pos+0x2c1/0x370 fs/file.c:1062
fdget_pos include/linux/file.h:74 [inline]
__do_sys_getdents64 fs/readdir.c:365 [inline]
__se_sys_getdents64+0x1dc/0x4f0 fs/readdir.c:354
do_syscall_64+0x46/0xc0
entry_SYSCALL_64_after_hwframe+0x6f/0xd9
RIP: 0033:0x7ff50387dda9
RSP: 002b:00007ff5045a70c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007ff5039ac050 RCX: 00007ff50387dda9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007ff5038ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007ff5039ac050 R15: 00007ffeb4f70208
</TASK>
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/13:
Showing all locks held in the system:
#0: ffffffff8d72b470 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd30 kernel/rcu/tasks.h:522
1 lock held by rcu_tasks_trace/14:
#0: ffffffff8d72b830 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd30 kernel/rcu/tasks.h:522
1 lock held by khungtaskd/28:
#0: ffffffff8d72b2a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by kworker/u4:2/29:
1 lock held by udevd/4478:
2 locks held by getty/4775:
#0: ffff88814b316098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc900015902f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b1/0x1dc0 drivers/tty/n_tty.c:2187
3 locks held by syz-executor.2/5525:
1 lock held by syz-executor.2/5529:
#0: ffff88802ba85c48 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2c1/0x370 fs/file.c:1062
3 locks held by syz-executor.1/5537:
1 lock held by syz-executor.1/5544:
#0: ffff88802bd45248 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2c1/0x370 fs/file.c:1062
3 locks held by syz-executor.4/5541:
1 lock held by syz-executor.4/5547:
#0: ffff8880294525c8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2c1/0x370 fs/file.c:1062
3 locks held by syz-executor.3/5550:
1 lock held by syz-executor.3/5555:
#0: ffff88802d6f8348 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2c1/0x370 fs/file.c:1062
3 locks held by syz-executor.0/5552:
1 lock held by syz-executor.0/5556:
#0: ffff88802288a848 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2c1/0x370 fs/file.c:1062
1 lock held by syz-executor.1/5838:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.5.0-rc4-syzkaller-00229-g0a2c2baafa31 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x187/0x310 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xec8/0xf10 kernel/hung_task.c:379
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
kthread+0x2ec/0x390 kernel/kthread.c:389
ret_from_fork+0x32/0x60 arch/x86/kernel/process.c:145
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:304
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 12278 Comm: syz-executor.1 Not tainted 6.5.0-rc4-syzkaller-00229-g0a2c2baafa31 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:smk_access_entry security/smack/smack_access.c:86 [inline]
RIP: 0010:smk_tskacc+0x223/0x360 security/smack/smack_access.c:234
Code: e8 12 bb ee fd 49 8b 36 bf 20 00 00 00 e8 75 1b 00 00 84 c0 74 1e e8 dc 4b 94 fd e9 81 00 00 00 e8 d2 4b 94 fd 45 31 e4 eb 77 <e8> c8 4b 94 fd 45 31 e4 eb 6d e8 be 4b 94 fd 45 89 ec eb 63 48 83
RSP: 0018:ffffc9000392f648 EFLAGS: 00000246
RAX: 1ffff11005d742c4 RBX: ffffffff8dd06320 RCX: ffff88801ab8bb80
RDX: ffff88801ab8bb80 RSI: 0000000000000000 RDI: 00000000ffffffff
RBP: ffff88802eba1620 R08: ffffffff83fbda6b R09: 0000000000000000
R10: ffffc9000392f708 R11: fffff52000725ee5 R12: ffffffff8b7195c0
R13: ffffffff8b7195c0 R14: ffff88802eba1620 R15: dffffc0000000000
FS: 00007fa55a5076c0(0000) GS:ffff8880b9600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555557549788 CR3: 000000002b9f4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<TASK>
smack_inode_permission+0x2dc/0x380 security/smack/smack_lsm.c:1158
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<TASK>
security_inode_permission+0xa5/0x100 security/security.c:2072
may_lookup fs/namei.c:1720 [inline]
link_path_walk+0x2da/0xe80 fs/namei.c:2267
path_openat+0x249/0x31e0 fs/namei.c:3789
do_filp_open+0x234/0x490 fs/namei.c:3820
do_sys_openat2+0x13e/0x1d0 fs/open.c:1407
do_sys_open fs/open.c:1422 [inline]
__do_sys_openat fs/open.c:1438 [inline]
__se_sys_openat fs/open.c:1433 [inline]
__x64_sys_openat+0x247/0x2a0 fs/open.c:1433
do_syscall_64+0x46/0xc0
entry_SYSCALL_64_after_hwframe+0x6f/0xd9
RIP: 0033:0x7fa55987c9a0
Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 09 82 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 5c 82 02 00 8b 44
RSP: 002b:00007fa55a506e30 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fa55987c9a0
RDX: 0000000000000002 RSI: 00007fa55a506f40 RDI: 00000000ffffff9c
RBP: 00007fa55a506f40 R08: 0000000000000000 R09: 00000000000014f8
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000004
R13: 00007fa55a506f80 R14: 00007fa55a506f40 R15: 00007fa5507ff000
</TASK>
Tested on:
commit: 0a2c2baa proc: fix missing conversion to 'iterate_shar..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=116e4711180000
kernel config: https://syzkaller.appspot.com/x/.config?x=52460339570262b2
dashboard link: https://syzkaller.appspot.com/bug?extid=f59c2feaf7cb5988e877
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Note: no patches were applied.
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
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