INFO: task syz-executor.2:9920 blocked for more than 143 seconds.
      Not tainted 5.12.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2  state:D stack:27680 pid: 9920 ppid:  8434 flags:0x00000004
Call Trace:
 context_switch kernel/sched/core.c:4324 [inline]
 __schedule+0x90c/0x21a0 kernel/sched/core.c:5075
 schedule+0xcf/0x270 kernel/sched/core.c:5154
 rwsem_down_write_slowpath+0x7e5/0x1200 kernel/locking/rwsem.c:1106
 __down_write_common kernel/locking/rwsem.c:1261 [inline]
 __down_write_common kernel/locking/rwsem.c:1258 [inline]
 __down_write kernel/locking/rwsem.c:1270 [inline]
 down_write+0x137/0x150 kernel/locking/rwsem.c:1407
 inode_lock include/linux/fs.h:775 [inline]
 lock_mount+0x8a/0x2e0 fs/namespace.c:2216
 do_new_mount_fc fs/namespace.c:2846 [inline]
 do_new_mount fs/namespace.c:2905 [inline]
 path_mount+0x14d6/0x1f90 fs/namespace.c:3233
 do_mount fs/namespace.c:3246 [inline]
 __do_sys_mount fs/namespace.c:3454 [inline]
 __se_sys_mount fs/namespace.c:3431 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3431
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x465f69
RSP: 002b:00007f616f5b3188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465f69
RDX: 0000000020002100 RSI: 00000000200020c0 RDI: 0000000000000000
RBP: 00000000004bfa3f R08: 0000000020002140 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008
R13: 00007ffc1904f56f R14: 00007f616f5b3300 R15: 0000000000022000

Showing all locks held in the system:
1 lock held by khungtaskd/1657:
 #0: ffffffff8bf74220 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6327
1 lock held by in:imklog/8107:
 #0: ffff888011bdfc70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:961
2 locks held by syz-executor.2/9913:
1 lock held by syz-executor.2/9920:
 #0: ffff888070a40150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline]
 #0: ffff888070a40150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lock_mount+0x8a/0x2e0 fs/namespace.c:2216

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

NMI backtrace for cpu 1
CPU: 1 PID: 1657 Comm: khungtaskd Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline]
 watchdog+0xd48/0xfb0 kernel/hung_task.c:294
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 338 Comm: kworker/u4:4 Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue:  0x0 (bat_events)
RIP: 0010:move_linked_works+0x1cc/0x2f0 kernel/workqueue.c:1067
Code: 00 00 4c 89 f8 4c 89 7b 10 48 c1 e8 03 80 3c 28 00 0f 85 e1 00 00 00 4d 89 27 e8 ef c5 29 00 48 89 d8 48 c1 e8 03 80 3c 28 00 <75> 72 48 8b 1b 31 ff 83 e3 08 48 89 de e8 f2 cd 29 00 48 85 db 0f
RSP: 0018:ffffc9000201fc60 EFLAGS: 00000046
RAX: 1ffff110038dcacb RBX: ffff88801c6e5658 RCX: 0000000000000000
RDX: ffff888012530000 RSI: ffffffff8149d871 RDI: ffff88801c6e5668
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff8149d807 R11: 0000000000000000 R12: ffff88801c6e5660
R13: ffff888021d08458 R14: ffff888010869858 R15: ffff8880137b95f8
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4fb049b000 CR3: 000000001ba6d000 CR4: 0000000000350ef0
Call Trace:
 pwq_activate_delayed_work+0xc6/0x1a0 kernel/workqueue.c:1145
 pwq_activate_first_delayed kernel/workqueue.c:1155 [inline]
 pwq_dec_nr_in_flight+0x18e/0x320 kernel/workqueue.c:1181
 process_one_work+0xc4b/0x1600 kernel/workqueue.c:2317
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294