INFO: task syz-executor.1:10448 blocked for more than 143 seconds.
      Not tainted 5.16.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:24752 pid:10448 ppid:  6537 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xb72/0x1460 kernel/sched/core.c:6253
 schedule+0x12b/0x1f0 kernel/sched/core.c:6326
 blk_mq_freeze_queue_wait+0x105/0x190 block/blk-mq.c:178
 lo_release+0x114/0x1f0 drivers/block/loop.c:1768
 blkdev_put_whole block/bdev.c:694 [inline]
 blkdev_put+0x477/0x7b0 block/bdev.c:956
 kill_f2fs_super+0x2f9/0x3c0 fs/f2fs/super.c:4478
 deactivate_locked_super+0xa7/0xf0 fs/super.c:335
 mount_bdev+0x288/0x3a0 fs/super.c:1372
 legacy_get_tree+0xea/0x180 fs/fs_context.c:610
 vfs_get_tree+0x86/0x270 fs/super.c:1500
 do_new_mount fs/namespace.c:2988 [inline]
 path_mount+0x1986/0x2c30 fs/namespace.c:3318
 do_mount fs/namespace.c:3331 [inline]
 __do_sys_mount fs/namespace.c:3539 [inline]
 __se_sys_mount+0x308/0x3c0 fs/namespace.c:3516
 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
RIP: 0033:0x7fcebc6b401a
RSP: 002b:00007fceb9c27fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007fcebc6b401a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fceb9c28000
RBP: 00007fceb9c28040 R08: 00007fceb9c28040 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000
R13: 0000000020000100 R14: 00007fceb9c28000 R15: 0000000020014b00
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8cd1da80 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
1 lock held by in:imklog/6202:
 #0: ffff888020336870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:990
2 locks held by syz-executor.1/10448:
 #0: ffff88801b18a118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xfa/0x7b0 block/bdev.c:914
 #1: ffff88801b04db60 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_release+0x4d/0x1f0 drivers/block/loop.c:1748

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

NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.16.0-rc1-syzkaller #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
 nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
 watchdog+0xc82/0xcd0 kernel/hung_task.c:295
 kthread+0x468/0x490 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 10 Comm: kworker/u4:1 Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
RIP: 0010:register_lock_class+0xd19/0x1390 kernel/locking/lockdep.c:1256
Code: 1a 45 31 ed 48 c7 c7 e0 fc 8e 8a 48 c7 c6 80 26 8f 8a 31 c0 e8 38 92 e8 ff 0f 0b 4d 89 e7 e9 64 ff ff ff 48 c7 c1 20 e9 db 90 <80> e1 07 80 c1 03 38 c1 0f 8c 6c f3 ff ff 48 c7 c7 20 e9 db 90 e8
RSP: 0018:ffffc90000cf7860 EFLAGS: 00000002
RAX: 1ffffffff21b7d04 RBX: 0000000000000000 RCX: ffffffff90dbe920
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc90000cf7d20
RBP: ffffc90000cf7970 R08: 0000000000000001 R09: 0000000000000000
R10: fffffbfff1c3d206 R11: 0000000000000000 R12: ffffc90000cf7d20
R13: 0000000000000000 R14: 1ffff9200019ef18 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c01e403100 CR3: 000000000ca8e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __lock_acquire+0x149/0x2b00 kernel/locking/lockdep.c:4906
 lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637
 process_one_work+0x827/0x1140 kernel/workqueue.c:2274
 worker_thread+0xac1/0x1320 kernel/workqueue.c:2445
 kthread+0x468/0x490 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30
 </TASK>
----------------
Code disassembly (best guess):
   0:	1a 45 31             	sbb    0x31(%rbp),%al
   3:	ed                   	in     (%dx),%eax
   4:	48 c7 c7 e0 fc 8e 8a 	mov    $0xffffffff8a8efce0,%rdi
   b:	48 c7 c6 80 26 8f 8a 	mov    $0xffffffff8a8f2680,%rsi
  12:	31 c0                	xor    %eax,%eax
  14:	e8 38 92 e8 ff       	callq  0xffe89251
  19:	0f 0b                	ud2
  1b:	4d 89 e7             	mov    %r12,%r15
  1e:	e9 64 ff ff ff       	jmpq   0xffffff87
  23:	48 c7 c1 20 e9 db 90 	mov    $0xffffffff90dbe920,%rcx
* 2a:	80 e1 07             	and    $0x7,%cl <-- trapping instruction
  2d:	80 c1 03             	add    $0x3,%cl
  30:	38 c1                	cmp    %al,%cl
  32:	0f 8c 6c f3 ff ff    	jl     0xfffff3a4
  38:	48 c7 c7 20 e9 db 90 	mov    $0xffffffff90dbe920,%rdi
  3f:	e8                   	.byte 0xe8