[v6.1] INFO: task hung in blkdev_get_by_dev
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syzbot
Jan 28, 2024, 7:39:32 PMJan 28
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 883d1a956208 Linux 6.1.75
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1324a4dfe80000
kernel config: https://syzkaller.appspot.com/x/.config?x=e191632f30d1d52a
dashboard link: https://syzkaller.appspot.com/bug?extid=769a3aefabbe0951666b
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/645482ac7dc7/disk-883d1a95.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/13fea10060e4/vmlinux-883d1a95.xz
kernel image: https://storage.googleapis.com/syzbot-assets/73f84b482a13/bzImage-883d1a95.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+769a3a...@syzkaller.appspotmail.com
INFO: task udevd:4276 blocked for more than 143 seconds.
Not tainted 6.1.75-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:23928 pid:4276 ppid:3003 flags:0x00004002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x142d/0x4550 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
blkdev_get_by_dev+0x148/0xa10 block/bdev.c:815
blkdev_open+0x12e/0x2e0 block/fops.c:500
do_dentry_open+0x7f9/0x10f0 fs/open.c:882
do_open fs/namei.c:3634 [inline]
path_openat+0x2644/0x2e60 fs/namei.c:3791
do_filp_open+0x230/0x480 fs/namei.c:3818
do_sys_openat2+0x13b/0x500 fs/open.c:1318
do_sys_open fs/open.c:1334 [inline]
__do_sys_openat fs/open.c:1350 [inline]
__se_sys_openat fs/open.c:1345 [inline]
__x64_sys_openat+0x243/0x290 fs/open.c:1345
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f13e2f169a4
RSP: 002b:00007ffdfd331240 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055d4b5027fd0 RCX: 00007f13e2f169a4
RDX: 00000000000a0800 RSI: 000055d4b500cbc0 RDI: 00000000ffffff9c
RBP: 000055d4b500cbc0 R08: 0000000000000001 R09: 0000000000000010
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800
R13: 000055d4b5016ad0 R14: 0000000000000001 R15: 000055d4b5005910
</TASK>
INFO: task syz-executor.3:3923 blocked for more than 145 seconds.
Not tainted 6.1.75-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3 state:D stack:25408 pid:3923 ppid:3595 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x142d/0x4550 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
io_schedule+0x88/0x100 kernel/sched/core.c:8786
folio_wait_bit_common+0x878/0x1290 mm/filemap.c:1296
__filemap_get_folio+0x47c/0xe80 mm/filemap.c:1931
truncate_inode_pages_range+0x598/0x1340 mm/truncate.c:377
kill_bdev block/bdev.c:76 [inline]
blkdev_flush_mapping+0x154/0x2b0 block/bdev.c:664
blkdev_put_whole block/bdev.c:695 [inline]
blkdev_put+0x4c0/0x750 block/bdev.c:955
blkdev_close+0x56/0x80 block/fops.c:514
__fput+0x3b7/0x890 fs/file_table.c:320
task_work_run+0x246/0x300 kernel/task_work.c:179
get_signal+0x15fc/0x17d0 kernel/signal.c:2639
arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd2b567cda9
RSP: 002b:00007fd2b63830c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007fd2b57abf80 RCX: 00007fd2b567cda9
RDX: 0000000000000000 RSI: 000000000000125f RDI: 0000000000000003
RBP: 00007fd2b56c947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fd2b57abf80 R15: 00007ffe7b3803b8
</TASK>
INFO: task syz-executor.4:3965 blocked for more than 146 seconds.
Not tainted 6.1.75-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4 state:D stack:27560 pid:3965 ppid:3580 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x142d/0x4550 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
blkdev_put+0x100/0x750 block/bdev.c:913
blkdev_close+0x56/0x80 block/fops.c:514
__fput+0x3b7/0x890 fs/file_table.c:320
task_work_run+0x246/0x300 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ff2aca7cda9
RSP: 002b:00007ff2ad7100c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007ff2acbabf80 RCX: 00007ff2aca7cda9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00007ff2acac947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007ff2acbabf80 R15: 00007ffda2eeb998
</TASK>
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8d12a490 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:516
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8d12ac90 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:516
1 lock held by khungtaskd/28:
#0: ffffffff8d12a2c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:318 [inline]
#0: ffffffff8d12a2c0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:759 [inline]
#0: ffffffff8d12a2c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6494
2 locks held by getty/3310:
#0: ffff88807e9e8098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc900031262f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a7/0x1db0 drivers/tty/n_tty.c:2188
1 lock held by udevd/3581:
#0: ffff88801fbea4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x148/0xa10 block/bdev.c:815
3 locks held by kworker/u4:6/3654:
#0: ffff888012616938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#1: ffffc9000428fd20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#2: ffffffff8d12f780 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x48/0x5f0 kernel/rcu/tree.c:3986
1 lock held by udevd/4276:
#0: ffff88801fbcd4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x148/0xa10 block/bdev.c:815
3 locks held by kworker/1:10/692:
#0: ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#1: ffffc90007fe7d20 (fqdir_free_work){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#2: ffffffff8d12f780 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x48/0x5f0 kernel/rcu/tree.c:3986
1 lock held by syz-executor.3/3923:
#0: ffff88801fbcd4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x100/0x750 block/bdev.c:913
1 lock held by syz-executor.4/3965:
#0: ffff88801fbea4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x100/0x750 block/bdev.c:913
1 lock held by syz-executor.4/4474:
#0: ffff88801fbea4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x148/0xa10 block/bdev.c:815
1 lock held by syz-executor.4/5223:
#0: ffff88801fbea4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x148/0xa10 block/bdev.c:815
1 lock held by syz-executor.4/5884:
#0: ffff88801fbea4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x148/0xa10 block/bdev.c:815
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.1.75-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x4e1/0x560 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1b0/0x3f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xf88/0xfd0 kernel/hung_task.c:377
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 2985 Comm: syslogd Not tainted 6.1.75-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:__skb_unlink include/linux/skbuff.h:2338 [inline]
RIP: 0010:__skb_try_recv_from_queue+0x236/0x770 net/core/datagram.c:197
Code: 80 e1 07 38 c1 0f 8c 77 ff ff ff 48 89 df e8 f1 7b 65 f9 e9 6a ff ff ff e8 67 23 0e f9 45 31 ed e9 bf 03 00 00 e8 5a 23 0e f9 <49> 83 c4 10 4c 89 e0 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 75 04 00
RSP: 0018:ffffc9000310f820 EFLAGS: 00000093
RAX: ffffffff887c4fc6 RBX: dffffc0000000000 RCX: ffff88807e3d3b80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff887c4dbf R09: ffffc9000310faa0
R10: ffffffffffffffff R11: dffffc0000000001 R12: ffff88807e9d49b8
R13: ffff888082c28b40 R14: 0000000000000000 R15: ffffc9000310fae0
FS: 00007f46212ec380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbc2c076ffc CR3: 000000007ee65000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<TASK>
__skb_try_recv_datagram+0x1b9/0x6a0 net/core/datagram.c:263
__unix_dgram_recvmsg+0x2a1/0x1260 net/unix/af_unix.c:2448
sock_recvmsg_nosec net/socket.c:1022 [inline]
sock_recvmsg net/socket.c:1040 [inline]
sock_read_iter+0x3b2/0x4b0 net/socket.c:1121
call_read_iter include/linux/fs.h:2243 [inline]
new_sync_read fs/read_write.c:389 [inline]
vfs_read+0x7de/0xbe0 fs/read_write.c:470
ksys_read+0x19c/0x2c0 fs/read_write.c:613
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f4621440b6a
Code: 00 3d 00 00 41 00 75 0d 50 48 8d 3d 2d 08 0a 00 e8 ea 7d 01 00 31 c0 e9 07 ff ff ff 64 8b 04 25 18 00 00 00 85 c0 75 1b 0f 05 <48> 3d 00 f0 ff ff 76 6c 48 8b 15 8f a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffe33584d88 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f4621440b6a
RDX: 00000000000000ff RSI: 000055590167c950 RDI: 0000000000000000
RBP: 000055590167c910 R08: 0000000000000001 R09: 0000000000000000
R10: 00007f46215df3a3 R11: 0000000000000246 R12: 000055590167c99e
R13: 000055590167c950 R14: 0000000000000000 R15: 00007f462161da80
</TASK>
---
This report 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.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
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: 883d1a956208 Linux 6.1.75
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1324a4dfe80000
kernel config: https://syzkaller.appspot.com/x/.config?x=e191632f30d1d52a
dashboard link: https://syzkaller.appspot.com/bug?extid=769a3aefabbe0951666b
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/645482ac7dc7/disk-883d1a95.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/13fea10060e4/vmlinux-883d1a95.xz
kernel image: https://storage.googleapis.com/syzbot-assets/73f84b482a13/bzImage-883d1a95.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+769a3a...@syzkaller.appspotmail.com
INFO: task udevd:4276 blocked for more than 143 seconds.
Not tainted 6.1.75-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:23928 pid:4276 ppid:3003 flags:0x00004002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x142d/0x4550 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
blkdev_get_by_dev+0x148/0xa10 block/bdev.c:815
blkdev_open+0x12e/0x2e0 block/fops.c:500
do_dentry_open+0x7f9/0x10f0 fs/open.c:882
do_open fs/namei.c:3634 [inline]
path_openat+0x2644/0x2e60 fs/namei.c:3791
do_filp_open+0x230/0x480 fs/namei.c:3818
do_sys_openat2+0x13b/0x500 fs/open.c:1318
do_sys_open fs/open.c:1334 [inline]
__do_sys_openat fs/open.c:1350 [inline]
__se_sys_openat fs/open.c:1345 [inline]
__x64_sys_openat+0x243/0x290 fs/open.c:1345
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f13e2f169a4
RSP: 002b:00007ffdfd331240 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055d4b5027fd0 RCX: 00007f13e2f169a4
RDX: 00000000000a0800 RSI: 000055d4b500cbc0 RDI: 00000000ffffff9c
RBP: 000055d4b500cbc0 R08: 0000000000000001 R09: 0000000000000010
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800
R13: 000055d4b5016ad0 R14: 0000000000000001 R15: 000055d4b5005910
</TASK>
INFO: task syz-executor.3:3923 blocked for more than 145 seconds.
Not tainted 6.1.75-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3 state:D stack:25408 pid:3923 ppid:3595 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x142d/0x4550 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
io_schedule+0x88/0x100 kernel/sched/core.c:8786
folio_wait_bit_common+0x878/0x1290 mm/filemap.c:1296
__filemap_get_folio+0x47c/0xe80 mm/filemap.c:1931
truncate_inode_pages_range+0x598/0x1340 mm/truncate.c:377
kill_bdev block/bdev.c:76 [inline]
blkdev_flush_mapping+0x154/0x2b0 block/bdev.c:664
blkdev_put_whole block/bdev.c:695 [inline]
blkdev_put+0x4c0/0x750 block/bdev.c:955
blkdev_close+0x56/0x80 block/fops.c:514
__fput+0x3b7/0x890 fs/file_table.c:320
task_work_run+0x246/0x300 kernel/task_work.c:179
get_signal+0x15fc/0x17d0 kernel/signal.c:2639
arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd2b567cda9
RSP: 002b:00007fd2b63830c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007fd2b57abf80 RCX: 00007fd2b567cda9
RDX: 0000000000000000 RSI: 000000000000125f RDI: 0000000000000003
RBP: 00007fd2b56c947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fd2b57abf80 R15: 00007ffe7b3803b8
</TASK>
INFO: task syz-executor.4:3965 blocked for more than 146 seconds.
Not tainted 6.1.75-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4 state:D stack:27560 pid:3965 ppid:3580 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x142d/0x4550 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
blkdev_put+0x100/0x750 block/bdev.c:913
blkdev_close+0x56/0x80 block/fops.c:514
__fput+0x3b7/0x890 fs/file_table.c:320
task_work_run+0x246/0x300 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ff2aca7cda9
RSP: 002b:00007ff2ad7100c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007ff2acbabf80 RCX: 00007ff2aca7cda9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00007ff2acac947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007ff2acbabf80 R15: 00007ffda2eeb998
</TASK>
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8d12a490 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:516
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8d12ac90 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:516
1 lock held by khungtaskd/28:
#0: ffffffff8d12a2c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:318 [inline]
#0: ffffffff8d12a2c0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:759 [inline]
#0: ffffffff8d12a2c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6494
2 locks held by getty/3310:
#0: ffff88807e9e8098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc900031262f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a7/0x1db0 drivers/tty/n_tty.c:2188
1 lock held by udevd/3581:
#0: ffff88801fbea4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x148/0xa10 block/bdev.c:815
3 locks held by kworker/u4:6/3654:
#0: ffff888012616938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#1: ffffc9000428fd20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#2: ffffffff8d12f780 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x48/0x5f0 kernel/rcu/tree.c:3986
1 lock held by udevd/4276:
#0: ffff88801fbcd4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x148/0xa10 block/bdev.c:815
3 locks held by kworker/1:10/692:
#0: ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#1: ffffc90007fe7d20 (fqdir_free_work){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#2: ffffffff8d12f780 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x48/0x5f0 kernel/rcu/tree.c:3986
1 lock held by syz-executor.3/3923:
#0: ffff88801fbcd4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x100/0x750 block/bdev.c:913
1 lock held by syz-executor.4/3965:
#0: ffff88801fbea4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x100/0x750 block/bdev.c:913
1 lock held by syz-executor.4/4474:
#0: ffff88801fbea4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x148/0xa10 block/bdev.c:815
1 lock held by syz-executor.4/5223:
#0: ffff88801fbea4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x148/0xa10 block/bdev.c:815
1 lock held by syz-executor.4/5884:
#0: ffff88801fbea4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x148/0xa10 block/bdev.c:815
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.1.75-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x4e1/0x560 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1b0/0x3f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xf88/0xfd0 kernel/hung_task.c:377
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 2985 Comm: syslogd Not tainted 6.1.75-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:__skb_unlink include/linux/skbuff.h:2338 [inline]
RIP: 0010:__skb_try_recv_from_queue+0x236/0x770 net/core/datagram.c:197
Code: 80 e1 07 38 c1 0f 8c 77 ff ff ff 48 89 df e8 f1 7b 65 f9 e9 6a ff ff ff e8 67 23 0e f9 45 31 ed e9 bf 03 00 00 e8 5a 23 0e f9 <49> 83 c4 10 4c 89 e0 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 75 04 00
RSP: 0018:ffffc9000310f820 EFLAGS: 00000093
RAX: ffffffff887c4fc6 RBX: dffffc0000000000 RCX: ffff88807e3d3b80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff887c4dbf R09: ffffc9000310faa0
R10: ffffffffffffffff R11: dffffc0000000001 R12: ffff88807e9d49b8
R13: ffff888082c28b40 R14: 0000000000000000 R15: ffffc9000310fae0
FS: 00007f46212ec380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbc2c076ffc CR3: 000000007ee65000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<TASK>
__skb_try_recv_datagram+0x1b9/0x6a0 net/core/datagram.c:263
__unix_dgram_recvmsg+0x2a1/0x1260 net/unix/af_unix.c:2448
sock_recvmsg_nosec net/socket.c:1022 [inline]
sock_recvmsg net/socket.c:1040 [inline]
sock_read_iter+0x3b2/0x4b0 net/socket.c:1121
call_read_iter include/linux/fs.h:2243 [inline]
new_sync_read fs/read_write.c:389 [inline]
vfs_read+0x7de/0xbe0 fs/read_write.c:470
ksys_read+0x19c/0x2c0 fs/read_write.c:613
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f4621440b6a
Code: 00 3d 00 00 41 00 75 0d 50 48 8d 3d 2d 08 0a 00 e8 ea 7d 01 00 31 c0 e9 07 ff ff ff 64 8b 04 25 18 00 00 00 85 c0 75 1b 0f 05 <48> 3d 00 f0 ff ff 76 6c 48 8b 15 8f a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffe33584d88 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f4621440b6a
RDX: 00000000000000ff RSI: 000055590167c950 RDI: 0000000000000000
RBP: 000055590167c910 R08: 0000000000000001 R09: 0000000000000000
R10: 00007f46215df3a3 R11: 0000000000000246 R12: 000055590167c99e
R13: 000055590167c950 R14: 0000000000000000 R15: 00007f462161da80
</TASK>
---
This report 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.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
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
Mar 30, 2024, 11:26:26 PMMar 30
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: e5cd595e23c1 Linux 6.1.83
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=153465c6180000
kernel config: https://syzkaller.appspot.com/x/.config?x=99d0cbbc2b2c7cfd
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11ca3ae5180000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/cd28292a2eef/disk-e5cd595e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e8297fd856b2/vmlinux-e5cd595e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ea8c74634429/bzImage-e5cd595e.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+769a3a...@syzkaller.appspotmail.com
INFO: task syz-executor366:3687 blocked for more than 143 seconds.
Not tainted 6.1.83-syzkaller #0
path_openat+0x2644/0x2e60 fs/namei.c:3785
do_filp_open+0x230/0x480 fs/namei.c:3812
RSP: 002b:00007f2b598ed218 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f2b599c21a8 RCX: 00007f2b59930c09
RDX: 0004000000004002 RSI: 0000000020000080 RDI: ffffffffffffff9c
RBP: 00007f2b599c21a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2b5998834c
R13: 6c756e2f7665642f R14: 0004000000004002 R15: 00007f2b5998800f
</TASK>
INFO: task syz-executor366:3688 blocked for more than 144 seconds.
Not tainted 6.1.83-syzkaller #0
path_openat+0x2644/0x2e60 fs/namei.c:3785
do_filp_open+0x230/0x480 fs/namei.c:3812
RSP: 002b:00007f2b598cc218 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f2b599c21b8 RCX: 00007f2b59930c09
RDX: 0004000000004002 RSI: 0000000020000080 RDI: ffffffffffffff9c
RBP: 00007f2b599c21b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2b5998834c
R13: 6c756e2f7665642f R14: 0004000000004002 R15: 00007f2b5998800f
#0: ffffffff8d12a940 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8d12a940 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6494
2 locks held by getty/3297:
#0: ffff88807ed48098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
2 locks held by syz-executor366/3674:
1 lock held by syz-executor366/3686:
1 lock held by syz-executor366/3687:
#0: ffff88801fe374c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x148/0xa10 block/bdev.c:815
2 locks held by syz-executor366/3685:
1 lock held by syz-executor366/3688:
#0: ffff88801fe374c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x148/0xa10 block/bdev.c:815
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.1.83-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:29 [inline]
RIP: 0010:rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
RIP: 0010:rcu_is_watching+0x56/0xb0 kernel/rcu/tree.c:721
Code: f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 a0 bc 6e 00 48 c7 c3 a8 56 03 00 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 <84> c0 75 1e 8b 03 65 ff 0d 65 31 8f 7e 74 0c 83 e0 04 c1 e8 02 5b
RSP: 0018:ffffc90003c2f4a8 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffff8880b99356a8 RCX: ffff88807b98d940
RDX: ffff88807b98d940 RSI: ffffffff8b3d2b20 RDI: ffffffff8b3d2ae0
RBP: 0000000000000001 R08: ffffffff8a860f99 R09: fffffbfff2092e45
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000013
R13: ffff88803d3d8582 R14: ffffffff8cb0f858 R15: dffffc0000000000
FS: 00007f2b598ed6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
rcu_read_lock_held+0x11/0x40 kernel/rcu/update.c:309
xa_entry include/linux/xarray.h:1198 [inline]
xas_descend+0x120/0x470 lib/xarray.c:204
xas_load lib/xarray.c:242 [inline]
xa_get_order+0x283/0x5a0 lib/xarray.c:1768
__filemap_add_folio+0x4ef/0x1ba0 mm/filemap.c:867
filemap_add_folio+0x11d/0x570 mm/filemap.c:934
page_cache_ra_unbounded+0x20c/0x7b0 mm/readahead.c:251
do_sync_mmap_readahead+0x7ae/0x980 mm/filemap.c:3107
filemap_fault+0x813/0x17e0 mm/filemap.c:3199
__do_fault+0x136/0x4f0 mm/memory.c:4261
do_shared_fault mm/memory.c:4667 [inline]
do_fault mm/memory.c:4745 [inline]
handle_pte_fault mm/memory.c:5013 [inline]
__handle_mm_fault mm/memory.c:5155 [inline]
handle_mm_fault+0x2243/0x5340 mm/memory.c:5276
do_user_addr_fault arch/x86/mm/fault.c:1371 [inline]
handle_page_fault arch/x86/mm/fault.c:1462 [inline]
exc_page_fault+0x26f/0x660 arch/x86/mm/fault.c:1518
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x7f2b5990931d
Code: 48 83 c4 08 4c 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 0f 1f 00 e8 93 cd ff ff eb 8d 90 31 c0 66 0f 1f 44 00 00 41 0f b6 14 04 <88> 14 07 48 83 c0 01 48 39 c3 75 ef 48 01 df 49 01 dc 49 89 7e 28
RSP: 002b:00007f2b598eca70 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000000
RDX: 0000000000000030 RSI: 00007f2b5998800f RDI: 0000000020000200
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2b5998800f
R13: 0000000000000002 R14: 00007f2b598ed000 R15: 00007f2b598ed140
</TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.514 msecs
---
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.
HEAD commit: e5cd595e23c1 Linux 6.1.83
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=153465c6180000
kernel config: https://syzkaller.appspot.com/x/.config?x=99d0cbbc2b2c7cfd
dashboard link: https://syzkaller.appspot.com/bug?extid=769a3aefabbe0951666b
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=116e732d180000
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11ca3ae5180000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/cd28292a2eef/disk-e5cd595e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e8297fd856b2/vmlinux-e5cd595e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ea8c74634429/bzImage-e5cd595e.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+769a3a...@syzkaller.appspotmail.com
Not tainted 6.1.83-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor366 state:D stack:27000 pid:3687 ppid:3600 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x142d/0x4550 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
<TASK>
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x142d/0x4550 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
blkdev_get_by_dev+0x148/0xa10 block/bdev.c:815
blkdev_open+0x12e/0x2e0 block/fops.c:500
do_dentry_open+0x7f9/0x10f0 fs/open.c:882
do_open fs/namei.c:3628 [inline]
blkdev_open+0x12e/0x2e0 block/fops.c:500
do_dentry_open+0x7f9/0x10f0 fs/open.c:882
path_openat+0x2644/0x2e60 fs/namei.c:3785
do_filp_open+0x230/0x480 fs/namei.c:3812
do_sys_openat2+0x13b/0x500 fs/open.c:1318
do_sys_open fs/open.c:1334 [inline]
__do_sys_openat fs/open.c:1350 [inline]
__se_sys_openat fs/open.c:1345 [inline]
__x64_sys_openat+0x243/0x290 fs/open.c:1345
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2b59930c09
do_sys_open fs/open.c:1334 [inline]
__do_sys_openat fs/open.c:1350 [inline]
__se_sys_openat fs/open.c:1345 [inline]
__x64_sys_openat+0x243/0x290 fs/open.c:1345
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RSP: 002b:00007f2b598ed218 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f2b599c21a8 RCX: 00007f2b59930c09
RDX: 0004000000004002 RSI: 0000000020000080 RDI: ffffffffffffff9c
RBP: 00007f2b599c21a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2b5998834c
R13: 6c756e2f7665642f R14: 0004000000004002 R15: 00007f2b5998800f
</TASK>
INFO: task syz-executor366:3688 blocked for more than 144 seconds.
Not tainted 6.1.83-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor366 state:D stack:27000 pid:3688 ppid:3602 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x142d/0x4550 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
<TASK>
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x142d/0x4550 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
blkdev_get_by_dev+0x148/0xa10 block/bdev.c:815
blkdev_open+0x12e/0x2e0 block/fops.c:500
do_dentry_open+0x7f9/0x10f0 fs/open.c:882
do_open fs/namei.c:3628 [inline]
blkdev_open+0x12e/0x2e0 block/fops.c:500
do_dentry_open+0x7f9/0x10f0 fs/open.c:882
path_openat+0x2644/0x2e60 fs/namei.c:3785
do_filp_open+0x230/0x480 fs/namei.c:3812
do_sys_openat2+0x13b/0x500 fs/open.c:1318
do_sys_open fs/open.c:1334 [inline]
__do_sys_openat fs/open.c:1350 [inline]
__se_sys_openat fs/open.c:1345 [inline]
__x64_sys_openat+0x243/0x290 fs/open.c:1345
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2b59930c09
do_sys_open fs/open.c:1334 [inline]
__do_sys_openat fs/open.c:1350 [inline]
__se_sys_openat fs/open.c:1345 [inline]
__x64_sys_openat+0x243/0x290 fs/open.c:1345
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RSP: 002b:00007f2b598cc218 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f2b599c21b8 RCX: 00007f2b59930c09
RDX: 0004000000004002 RSI: 0000000020000080 RDI: ffffffffffffff9c
RBP: 00007f2b599c21b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2b5998834c
R13: 6c756e2f7665642f R14: 0004000000004002 R15: 00007f2b5998800f
</TASK>
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8d12ab10 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:516
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8d12b310 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:516
1 lock held by khungtaskd/28:
#0: ffffffff8d12a940 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8d12a940 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8d12a940 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6494
2 locks held by getty/3297:
#0: ffff88807ed48098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc900031262f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a7/0x1db0 drivers/tty/n_tty.c:2188
2 locks held by syz-executor366/3646:
2 locks held by syz-executor366/3674:
1 lock held by syz-executor366/3686:
1 lock held by syz-executor366/3687:
#0: ffff88801fe374c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x148/0xa10 block/bdev.c:815
2 locks held by syz-executor366/3685:
1 lock held by syz-executor366/3688:
#0: ffff88801fe374c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x148/0xa10 block/bdev.c:815
=============================================
NMI backtrace for cpu 0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x4e1/0x560 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1b0/0x3f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xf88/0xfd0 kernel/hung_task.c:377
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:307
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x4e1/0x560 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1b0/0x3f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xf88/0xfd0 kernel/hung_task.c:377
kthread+0x28d/0x320 kernel/kthread.c:376
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3674 Comm: syz-executor366 Not tainted 6.1.83-syzkaller #0
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:29 [inline]
RIP: 0010:rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
RIP: 0010:rcu_is_watching+0x56/0xb0 kernel/rcu/tree.c:721
Code: f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 a0 bc 6e 00 48 c7 c3 a8 56 03 00 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 <84> c0 75 1e 8b 03 65 ff 0d 65 31 8f 7e 74 0c 83 e0 04 c1 e8 02 5b
RSP: 0018:ffffc90003c2f4a8 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffff8880b99356a8 RCX: ffff88807b98d940
RDX: ffff88807b98d940 RSI: ffffffff8b3d2b20 RDI: ffffffff8b3d2ae0
RBP: 0000000000000001 R08: ffffffff8a860f99 R09: fffffbfff2092e45
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000013
R13: ffff88803d3d8582 R14: ffffffff8cb0f858 R15: dffffc0000000000
FS: 00007f2b598ed6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c638d90680 CR3: 000000007f21b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<TASK>
rcu_read_lock_held_common kernel/rcu/update.c:108 [inline]
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<TASK>
rcu_read_lock_held+0x11/0x40 kernel/rcu/update.c:309
xa_entry include/linux/xarray.h:1198 [inline]
xas_descend+0x120/0x470 lib/xarray.c:204
xas_load lib/xarray.c:242 [inline]
xa_get_order+0x283/0x5a0 lib/xarray.c:1768
__filemap_add_folio+0x4ef/0x1ba0 mm/filemap.c:867
filemap_add_folio+0x11d/0x570 mm/filemap.c:934
page_cache_ra_unbounded+0x20c/0x7b0 mm/readahead.c:251
do_sync_mmap_readahead+0x7ae/0x980 mm/filemap.c:3107
filemap_fault+0x813/0x17e0 mm/filemap.c:3199
__do_fault+0x136/0x4f0 mm/memory.c:4261
do_shared_fault mm/memory.c:4667 [inline]
do_fault mm/memory.c:4745 [inline]
handle_pte_fault mm/memory.c:5013 [inline]
__handle_mm_fault mm/memory.c:5155 [inline]
handle_mm_fault+0x2243/0x5340 mm/memory.c:5276
do_user_addr_fault arch/x86/mm/fault.c:1371 [inline]
handle_page_fault arch/x86/mm/fault.c:1462 [inline]
exc_page_fault+0x26f/0x660 arch/x86/mm/fault.c:1518
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x7f2b5990931d
Code: 48 83 c4 08 4c 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 0f 1f 00 e8 93 cd ff ff eb 8d 90 31 c0 66 0f 1f 44 00 00 41 0f b6 14 04 <88> 14 07 48 83 c0 01 48 39 c3 75 ef 48 01 df 49 01 dc 49 89 7e 28
RSP: 002b:00007f2b598eca70 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000000
RDX: 0000000000000030 RSI: 00007f2b5998800f RDI: 0000000020000200
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2b5998800f
R13: 0000000000000002 R14: 00007f2b598ed000 R15: 00007f2b598ed140
</TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.514 msecs
---
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