INFO: task syz-executor:5908 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:20024 pid:5908  tgid:5908  ppid:1      task_flags:0x400140 flags:0x00004006
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 __bch2_fs_stop+0x704/0x900
 generic_shutdown_super+0x135/0x2c0
 bch2_kill_sb+0x41/0x50
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f793cd8fed7
RSP: 002b:00007fffc1b39338 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f793cd8fed7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffc1b393f0
RBP: 00007fffc1b393f0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fffc1b3a480
R13: 00007f793ce11c05 R14: 0000000000033edd R15: 00007fffc1b3a4c0
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e13a0e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5676:
 #0: ffff888104b6f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
1 lock held by syz-executor/5773:
 #0: ffff888136639f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
1 lock held by syz-executor/5908:
 #0: ffff8881197a20e0 (&type->s_umount_key#73){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by syz.6.1010/10207:
 #0: ffff8881197a20e0 (&type->s_umount_key#73){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.0.1047/10462:
 #0: ffff8881197a20e0 (&type->s_umount_key#73){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.4.1156/10970:
 #0: ffff8881197a20e0 (&type->s_umount_key#73){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.8.1315/11699:
 #0: ffff8881197a20e0 (&type->s_umount_key#73){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.9.1850/13377:
 #0: ffff8881197a20e0 (&type->s_umount_key#73){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.1.1876/13431:
 #0: ffff8881197a20e0 (&type->s_umount_key#73){++++}-{4:4}, at: super_lock+0x2a9/0x3b0

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:trace_hardirqs_off+0x2f/0x40
Code: 48 8b 5c 24 08 48 89 df e8 4e f1 b2 09 65 8b 05 37 51 da 10 85 c0 74 07 5b e9 8d d3 b5 09 cc 65 c7 05 21 51 da 10 01 00 00 00 <48> 89 df 5b e9 a8 fe ff ff 0f 1f 84 00 00 00 00 00 90 90 90 90 90
RSP: 0018:ffffc90000177d50 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffffff81b1a86b RCX: 0376a4351d5ae000
RDX: 0000000000000000 RSI: ffffffff8d9b9e62 RDI: ffffffff8be33e80
RBP: ffffc90000177df0 R08: ffff88813663a007 R09: 1ffff11026cc7400
R10: dffffc0000000000 R11: ffffed1026cc7401 R12: 1ffff9200002efac
R13: 0000000000000000 R14: 0000000000000001 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881a3c15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe66b3ab88 CR3: 000000001f542000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 tick_nohz_idle_enter+0x10b/0x2f0
 do_idle+0x9e/0x510
 cpu_startup_entry+0x44/0x60
 start_secondary+0x101/0x110
 common_startup_64+0x13e/0x147
 </TASK>
