* [syzbot] possible deadlock in blkdev_put (3)
@ 2022-03-12 16:25 syzbot
2022-03-14 4:45 ` syzbot
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2022-03-12 16:25 UTC (permalink / raw)
To: axboe, linux-block, linux-kernel, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 68453767131a ARM: Spectre-BHB: provide empty stub for non-..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17bd4709700000
kernel config: https://syzkaller.appspot.com/x/.config?x=16438642a37fea1
dashboard link: https://syzkaller.appspot.com/bug?extid=6479585dfd4dedd3f7e1
compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6479585dfd4dedd3f7e1@syzkaller.appspotmail.com
======================================================
WARNING: possible circular locking dependency detected
5.17.0-rc7-syzkaller-00227-g68453767131a #0 Not tainted
------------------------------------------------------
udevd/6428 is trying to acquire lock:
ffff88801d66a938 ((wq_completion)loop3){+.+.}-{0:0}, at: flush_workqueue+0x172/0x16b0 kernel/workqueue.c:2827
but task is already holding lock:
ffff88801ab90918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xf8/0x7a0 block/bdev.c:902
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #6 (&disk->open_mutex){+.+.}-{3:3}:
lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5639
__mutex_lock_common+0x1d5/0x2590 kernel/locking/mutex.c:600
__mutex_lock kernel/locking/mutex.c:733 [inline]
mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:785
blkdev_get_by_dev+0x169/0xd70 block/bdev.c:804
swsusp_check+0xb0/0x3f0 kernel/power/swap.c:1526
software_resume+0xc8/0x3d0 kernel/power/hibernate.c:979
resume_store+0xdc/0x120 kernel/power/hibernate.c:1181
kernfs_fop_write_iter+0x3b6/0x510 fs/kernfs/file.c:296
call_write_iter include/linux/fs.h:2074 [inline]
new_sync_write fs/read_write.c:503 [inline]
vfs_write+0xb11/0xe90 fs/read_write.c:590
ksys_write+0x18f/0x2c0 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #5 (system_transition_mutex/1){+.+.}-{3:3}:
lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5639
__mutex_lock_common+0x1d5/0x2590 kernel/locking/mutex.c:600
__mutex_lock kernel/locking/mutex.c:733 [inline]
mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:785
software_resume+0x7a/0x3d0 kernel/power/hibernate.c:934
resume_store+0xdc/0x120 kernel/power/hibernate.c:1181
kernfs_fop_write_iter+0x3b6/0x510 fs/kernfs/file.c:296
call_write_iter include/linux/fs.h:2074 [inline]
new_sync_write fs/read_write.c:503 [inline]
vfs_write+0xb11/0xe90 fs/read_write.c:590
ksys_write+0x18f/0x2c0 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #4 (&of->mutex){+.+.}-{3:3}:
lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5639
__mutex_lock_common+0x1d5/0x2590 kernel/locking/mutex.c:600
__mutex_lock kernel/locking/mutex.c:733 [inline]
mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:785
kernfs_seq_start+0x50/0x3b0 fs/kernfs/file.c:112
seq_read_iter+0x3cd/0xd30 fs/seq_file.c:225
call_read_iter include/linux/fs.h:2068 [inline]
new_sync_read fs/read_write.c:400 [inline]
vfs_read+0xaf9/0xe60 fs/read_write.c:481
ksys_read+0x18f/0x2c0 fs/read_write.c:619
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #3 (&p->lock){+.+.}-{3:3}:
lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5639
__mutex_lock_common+0x1d5/0x2590 kernel/locking/mutex.c:600
__mutex_lock kernel/locking/mutex.c:733 [inline]
mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:785
seq_read_iter+0xad/0xd30 fs/seq_file.c:182
call_read_iter include/linux/fs.h:2068 [inline]
generic_file_splice_read+0x482/0x760 fs/splice.c:311
do_splice_to fs/splice.c:796 [inline]
splice_direct_to_actor+0x45f/0xd00 fs/splice.c:870
do_splice_direct+0x291/0x3e0 fs/splice.c:979
do_sendfile+0x6fe/0x1040 fs/read_write.c:1245
__do_sys_sendfile64 fs/read_write.c:1310 [inline]
__se_sys_sendfile64+0x171/0x1d0 fs/read_write.c:1296
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #2 (sb_writers#3){.+.+}-{0:0}:
lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5639
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1722 [inline]
sb_start_write include/linux/fs.h:1792 [inline]
file_start_write include/linux/fs.h:2937 [inline]
lo_write_bvec drivers/block/loop.c:243 [inline]
lo_write_simple drivers/block/loop.c:266 [inline]
do_req_filebacked drivers/block/loop.c:495 [inline]
loop_handle_cmd drivers/block/loop.c:1852 [inline]
loop_process_work+0x167f/0x22b0 drivers/block/loop.c:1892
process_one_work+0x86c/0x1190 kernel/workqueue.c:2307
worker_thread+0xab1/0x1300 kernel/workqueue.c:2454
kthread+0x2a3/0x2d0 kernel/kthread.c:377
ret_from_fork+0x1f/0x30
-> #1 ((work_completion)(&lo->rootcg_work)){+.+.}-{0:0}:
lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5639
process_one_work+0x83c/0x1190 kernel/workqueue.c:2283
worker_thread+0xab1/0x1300 kernel/workqueue.c:2454
kthread+0x2a3/0x2d0 kernel/kthread.c:377
ret_from_fork+0x1f/0x30
-> #0 ((wq_completion)loop3){+.+.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3063 [inline]
check_prevs_add kernel/locking/lockdep.c:3186 [inline]
validate_chain+0x1dfb/0x8250 kernel/locking/lockdep.c:3801
__lock_acquire+0x1382/0x2b00 kernel/locking/lockdep.c:5027
lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5639
flush_workqueue+0x18e/0x16b0 kernel/workqueue.c:2827
drain_workqueue+0xc3/0x3a0 kernel/workqueue.c:2992
destroy_workqueue+0x7d/0xed0 kernel/workqueue.c:4429
__loop_clr_fd+0x1bd/0x980 drivers/block/loop.c:1124
blkdev_put+0x5a7/0x7a0
blkdev_close+0x58/0x80 block/fops.c:517
__fput+0x3fc/0x870 fs/file_table.c:317
task_work_run+0x146/0x1c0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
exit_to_user_mode_prepare+0x209/0x220 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300
do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
other info that might help us debug this:
Chain exists of:
(wq_completion)loop3 --> system_transition_mutex/1 --> &disk->open_mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&disk->open_mutex);
lock(system_transition_mutex/1);
lock(&disk->open_mutex);
lock((wq_completion)loop3);
*** DEADLOCK ***
1 lock held by udevd/6428:
#0: ffff88801ab90918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xf8/0x7a0 block/bdev.c:902
stack backtrace:
CPU: 0 PID: 6428 Comm: udevd Not tainted 5.17.0-rc7-syzkaller-00227-g68453767131a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106
check_noncircular+0x2f9/0x3b0 kernel/locking/lockdep.c:2143
check_prev_add kernel/locking/lockdep.c:3063 [inline]
check_prevs_add kernel/locking/lockdep.c:3186 [inline]
validate_chain+0x1dfb/0x8250 kernel/locking/lockdep.c:3801
__lock_acquire+0x1382/0x2b00 kernel/locking/lockdep.c:5027
lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5639
flush_workqueue+0x18e/0x16b0 kernel/workqueue.c:2827
drain_workqueue+0xc3/0x3a0 kernel/workqueue.c:2992
destroy_workqueue+0x7d/0xed0 kernel/workqueue.c:4429
__loop_clr_fd+0x1bd/0x980 drivers/block/loop.c:1124
blkdev_put+0x5a7/0x7a0
blkdev_close+0x58/0x80 block/fops.c:517
__fput+0x3fc/0x870 fs/file_table.c:317
task_work_run+0x146/0x1c0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
exit_to_user_mode_prepare+0x209/0x220 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300
do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f3819885fc3
Code: 48 ff ff ff b8 ff ff ff ff e9 3e ff ff ff 66 0f 1f 84 00 00 00 00 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8
RSP: 002b:00007ffc29e6f138 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00007f381972e6a8 RCX: 00007f3819885fc3
RDX: 000000000000001c RSI: 00007ffc29e6e938 RDI: 0000000000000008
RBP: 000055f83c052190 R08: 0000000000000007 R09: 000055f83c057f00
R10: 00007f3819914fc0 R11: 0000000000000246 R12: 0000000000000002
R13: 000055f83c04c1b0 R14: 0000000000000008 R15: 000055f83c028910
</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 syzkaller@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [syzbot] possible deadlock in blkdev_put (3)
2022-03-12 16:25 [syzbot] possible deadlock in blkdev_put (3) syzbot
@ 2022-03-14 4:45 ` syzbot
0 siblings, 0 replies; 2+ messages in thread
From: syzbot @ 2022-03-14 4:45 UTC (permalink / raw)
To: axboe, hch, jack, linux-block, linux-kernel, penguin-kernel,
syzkaller-bugs
syzbot has found a reproducer for the following issue on:
HEAD commit: f0e18b03fcaf Merge tag 'x86_urgent_for_v5.17_rc8' of git:/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1547fb03700000
kernel config: https://syzkaller.appspot.com/x/.config?x=aba0ab2928a512c2
dashboard link: https://syzkaller.appspot.com/bug?extid=6479585dfd4dedd3f7e1
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1704bd29700000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14f78d41700000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6479585dfd4dedd3f7e1@syzkaller.appspotmail.com
======================================================
WARNING: possible circular locking dependency detected
5.17.0-rc7-syzkaller-00241-gf0e18b03fcaf #0 Not tainted
------------------------------------------------------
udevd/3652 is trying to acquire lock:
ffff888018c7a938 ((wq_completion)loop0){+.+.}-{0:0}, at: flush_workqueue+0xe1/0x13a0 kernel/workqueue.c:2824
but task is already holding lock:
ffff88801a0fa918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x99/0x950 block/bdev.c:902
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #6 (&disk->open_mutex){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:600 [inline]
__mutex_lock+0x12f/0x12f0 kernel/locking/mutex.c:733
blkdev_get_by_dev.part.0+0x40e/0xc70 block/bdev.c:804
blkdev_get_by_dev+0x6b/0x80 block/bdev.c:847
swsusp_check+0x97/0x420 kernel/power/swap.c:1526
software_resume.part.0+0x102/0x1f0 kernel/power/hibernate.c:979
software_resume kernel/power/hibernate.c:86 [inline]
resume_store+0x161/0x190 kernel/power/hibernate.c:1181
kobj_attr_store+0x50/0x80 lib/kobject.c:856
sysfs_kf_write+0x110/0x160 fs/sysfs/file.c:136
kernfs_fop_write_iter+0x3f8/0x610 fs/kernfs/file.c:296
call_write_iter include/linux/fs.h:2074 [inline]
new_sync_write+0x431/0x660 fs/read_write.c:503
vfs_write+0x7cd/0xae0 fs/read_write.c:590
ksys_write+0x12d/0x250 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #5 (system_transition_mutex/1){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:600 [inline]
__mutex_lock+0x12f/0x12f0 kernel/locking/mutex.c:733
software_resume.part.0+0x19/0x1f0 kernel/power/hibernate.c:934
software_resume kernel/power/hibernate.c:86 [inline]
resume_store+0x161/0x190 kernel/power/hibernate.c:1181
kobj_attr_store+0x50/0x80 lib/kobject.c:856
sysfs_kf_write+0x110/0x160 fs/sysfs/file.c:136
kernfs_fop_write_iter+0x3f8/0x610 fs/kernfs/file.c:296
call_write_iter include/linux/fs.h:2074 [inline]
new_sync_write+0x431/0x660 fs/read_write.c:503
vfs_write+0x7cd/0xae0 fs/read_write.c:590
ksys_write+0x12d/0x250 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #4 (&of->mutex){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:600 [inline]
__mutex_lock+0x12f/0x12f0 kernel/locking/mutex.c:733
kernfs_seq_start+0x47/0x470 fs/kernfs/file.c:112
seq_read_iter+0x2c6/0x1280 fs/seq_file.c:225
kernfs_fop_read_iter+0x514/0x6f0 fs/kernfs/file.c:241
call_read_iter include/linux/fs.h:2068 [inline]
new_sync_read+0x429/0x6e0 fs/read_write.c:400
vfs_read+0x35c/0x600 fs/read_write.c:481
ksys_read+0x12d/0x250 fs/read_write.c:619
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #3 (&p->lock){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:600 [inline]
__mutex_lock+0x12f/0x12f0 kernel/locking/mutex.c:733
seq_read_iter+0xdf/0x1280 fs/seq_file.c:182
call_read_iter include/linux/fs.h:2068 [inline]
generic_file_splice_read+0x45b/0x6d0 fs/splice.c:311
do_splice_to+0x1bf/0x250 fs/splice.c:796
splice_direct_to_actor+0x2c2/0x8c0 fs/splice.c:870
do_splice_direct+0x1b3/0x280 fs/splice.c:979
do_sendfile+0xaf2/0x1250 fs/read_write.c:1245
__do_sys_sendfile64 fs/read_write.c:1310 [inline]
__se_sys_sendfile64 fs/read_write.c:1296 [inline]
__x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1296
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #2 (sb_writers#3){.+.+}-{0:0}:
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1722 [inline]
sb_start_write include/linux/fs.h:1792 [inline]
file_start_write include/linux/fs.h:2937 [inline]
lo_write_bvec drivers/block/loop.c:243 [inline]
lo_write_simple drivers/block/loop.c:266 [inline]
do_req_filebacked drivers/block/loop.c:495 [inline]
loop_handle_cmd drivers/block/loop.c:1852 [inline]
loop_process_work+0x1499/0x1db0 drivers/block/loop.c:1892
process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307
worker_thread+0x657/0x1110 kernel/workqueue.c:2454
kthread+0x2e9/0x3a0 kernel/kthread.c:377
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
-> #1 ((work_completion)(&lo->rootcg_work)){+.+.}-{0:0}:
process_one_work+0x91b/0x1650 kernel/workqueue.c:2283
worker_thread+0x657/0x1110 kernel/workqueue.c:2454
kthread+0x2e9/0x3a0 kernel/kthread.c:377
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
-> #0 ((wq_completion)loop0){+.+.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3063 [inline]
check_prevs_add kernel/locking/lockdep.c:3186 [inline]
validate_chain kernel/locking/lockdep.c:3801 [inline]
__lock_acquire+0x2ad4/0x56c0 kernel/locking/lockdep.c:5027
lock_acquire kernel/locking/lockdep.c:5639 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5604
flush_workqueue+0x110/0x13a0 kernel/workqueue.c:2827
drain_workqueue+0x1a5/0x3c0 kernel/workqueue.c:2992
destroy_workqueue+0x71/0x800 kernel/workqueue.c:4429
__loop_clr_fd+0x1ab/0xe20 drivers/block/loop.c:1124
lo_release+0x1ac/0x1f0 drivers/block/loop.c:1756
blkdev_put_whole block/bdev.c:689 [inline]
blkdev_put+0x2de/0x950 block/bdev.c:944
blkdev_close+0x6a/0x80 block/fops.c:517
__fput+0x286/0x9f0 fs/file_table.c:317
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
other info that might help us debug this:
Chain exists of:
(wq_completion)loop0 --> system_transition_mutex/1 --> &disk->open_mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&disk->open_mutex);
lock(system_transition_mutex/1);
lock(&disk->open_mutex);
lock((wq_completion)loop0);
*** DEADLOCK ***
1 lock held by udevd/3652:
#0: ffff88801a0fa918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x99/0x950 block/bdev.c:902
stack backtrace:
CPU: 0 PID: 3652 Comm: udevd Not tainted 5.17.0-rc7-syzkaller-00241-gf0e18b03fcaf #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2143
check_prev_add kernel/locking/lockdep.c:3063 [inline]
check_prevs_add kernel/locking/lockdep.c:3186 [inline]
validate_chain kernel/locking/lockdep.c:3801 [inline]
__lock_acquire+0x2ad4/0x56c0 kernel/locking/lockdep.c:5027
lock_acquire kernel/locking/lockdep.c:5639 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5604
flush_workqueue+0x110/0x13a0 kernel/workqueue.c:2827
drain_workqueue+0x1a5/0x3c0 kernel/workqueue.c:2992
destroy_workqueue+0x71/0x800 kernel/workqueue.c:4429
__loop_clr_fd+0x1ab/0xe20 drivers/block/loop.c:1124
lo_release+0x1ac/0x1f0 drivers/block/loop.c:1756
blkdev_put_whole block/bdev.c:689 [inline]
blkdev_put+0x2de/0x950 block/bdev.c:944
blkdev_close+0x6a/0x80 block/fops.c:517
__fput+0x286/0x9f0 fs/file_table.c:317
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f0ca7b90fc3
Code: 48 ff ff ff b8 ff ff ff ff e9 3e ff ff ff 66 0f 1f 84 00 00 00 00 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8
RSP: 002b:00007ffcf6cd76d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00007f0ca7a396a8 RCX: 00007f0ca7b90fc3
RDX: 000000000000001c RSI: 00007ffcf6cd6ed8 RDI: 0000000000000008
RBP: 0000564a5512feb0 R08: 0000000000000007 R09: 0000564a55126a00
R10: 0000000002423870 R11: 0000000000000246 R12: 0000000000000002
R13: 0000564a55116f80 R14: 0000000000000008 R15: 0000564a550e82c0
</TASK>
I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop0, logical block 0, async page read
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2022-03-12 16:25 [syzbot] possible deadlock in blkdev_put (3) syzbot
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