EXT4-fs (loop0): re-mounted. Opts: (null)
EXT4-fs (loop0): re-mounted. Opts: (null)
EXT4-fs (loop0): re-mounted. Opts: (null)
EXT4-fs (loop0): re-mounted. Opts: (null)
INFO: task syz-executor405:8123 blocked for more than 140 seconds.
      Not tainted 4.19.211-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor405 D27656  8123   8121 0x00000000
Call Trace:
 context_switch kernel/sched/core.c:2828 [inline]
 __schedule+0x887/0x2040 kernel/sched/core.c:3517
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
 schedule_timeout+0x92d/0xfe0 kernel/time/timer.c:1794
 do_wait_for_common kernel/sched/completion.c:83 [inline]
 __wait_for_common kernel/sched/completion.c:104 [inline]
 wait_for_common+0x29c/0x470 kernel/sched/completion.c:115
 kthread_stop+0x109/0x6b0 kernel/kthread.c:588
 ext4_put_super+0x93c/0x1010 fs/ext4/super.c:1054
 generic_shutdown_super+0x144/0x370 fs/super.c:456
 kill_block_super+0x97/0xf0 fs/super.c:1185
 deactivate_locked_super+0x94/0x160 fs/super.c:329
 deactivate_super+0x174/0x1a0 fs/super.c:360
 cleanup_mnt+0x1a8/0x290 fs/namespace.c:1098
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f5e9f295c97
Code: Bad RIP value.
RSP: 002b:00007ffcfb64b848 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00000000000deee5 RCX: 00007f5e9f295c97
RDX: 00007ffcfb64b90a RSI: 000000000000000a RDI: 00007ffcfb64b900
RBP: 00007ffcfb64b900 R08: 00000000ffffffff R09: 00007ffcfb64b6e0
R10: 00005555572ef633 R11: 0000000000000206 R12: 00007ffcfb64c970
R13: 00005555572ef5f0 R14: 00007ffcfb64b870 R15: 000000000000005a

Showing all locks held in the system:
1 lock held by khungtaskd/1570:
 #0: 00000000ca05a284 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441
1 lock held by in:imklog/7822:
 #0: 00000000ccd8792a (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767
1 lock held by syz-executor405/8123:
 #0: 00000000cf6887b0 (&type->s_umount_key#39){++++}, at: deactivate_super+0x16c/0x1a0 fs/super.c:359

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

NMI backtrace for cpu 1
CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline]
 watchdog+0x991/0xe60 kernel/hung_task.c:287
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 10 Comm: rcu_preempt Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:__trace_hardirqs_on_caller kernel/locking/lockdep.c:2843 [inline]
RIP: 0010:lockdep_hardirqs_on+0x342/0x5c0 kernel/locking/lockdep.c:2884
Code: 83 30 08 00 00 48 8d bb 48 08 00 00 48 89 fa 48 c1 ea 03 8d 68 01 48 b8 00 00 00 00 00 fc ff df 89 ab 30 08 00 00 0f b6 04 02 <84> c0 74 08 3c 03 0f 8e 38 01 00 00 89 ab 48 08 00 00 65 48 8b 1c
RSP: 0018:ffff8880b5a67b70 EFLAGS: 00000806
RAX: 0000000000000000 RBX: ffff8880b5a4e280 RCX: 0000000000000000
RDX: 1ffff11016b49d59 RSI: 0000000000000001 RDI: ffff8880b5a4eac8
RBP: 0000000000011dc7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: dffffc0000000000 R14: ffff8880ba022b40 R15: 00000000ffffffff
FS:  0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f31be19d000 CR3: 00000000a13e6000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
 _raw_spin_unlock_irqrestore+0x79/0xe0 kernel/locking/spinlock.c:184
 try_to_del_timer_sync+0xbf/0x110 kernel/time/timer.c:1242
 del_timer_sync+0x1a4/0x270 kernel/time/timer.c:1305
 schedule_timeout+0x4d7/0xfe0 kernel/time/timer.c:1819
 rcu_gp_kthread+0xdad/0x21c0 kernel/rcu/tree.c:2202
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415