INFO: task syz.5.873:13121 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.873       state:D stack:25128 pid:13121 tgid:13120 ppid:8131   task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x5fd/0x8f0
 down_read+0x98/0x2e0
 super_lock+0x2a9/0x3b0
 __iterate_supers+0x126/0x290
 __se_sys_quotactl+0x353/0x950
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f398d98ebe9
RSP: 002b:00007f398e784038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f398dbb5fa0 RCX: 00007f398d98ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000101
RBP: 00007f398da11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f398dbb6038 R14: 00007f398dbb5fa0 R15: 00007ffc2cedac38
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/u10:2/69:
2 locks held by getty/5672:
 #0: ffff8881073c10a0 (&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
3 locks held by kworker/u8:3/5871:
 #0: ffff888136639f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
 #1: ffff888136624008 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880
 #2: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: batadv_nc_worker+0xd2/0x610
2 locks held by syz-executor/10945:
1 lock held by syz.5.873/13121:
 #0: ffff8880354d20e0 (&type->s_umount_key#56){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.2.1033/14654:
 #0: ffff8880354d20e0 (&type->s_umount_key#56){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.9.1095/15417:
 #0: ffff8880354d20e0 (&type->s_umount_key#56){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.0.1110/15593:
 #0: ffff8880354d20e0 (&type->s_umount_key#56){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.5.1180/16304:

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

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+0x3fc/0x770
 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: 10945 Comm: syz-executor 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:preempt_count_add+0x4d/0x1a0
Code: 84 c0 0f 85 f1 00 00 00 83 3d 2e a7 1b 18 00 75 07 65 8b 05 35 54 10 11 65 01 3d 2e 54 10 11 48 c7 c0 20 a3 ab 99 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 ec 00 00 00 83 3d ff a6 1b 18 00 75 11
RSP: 0018:ffffc90002cff8f0 EFLAGS: 00000a02
RAX: 1ffffffff3357464 RBX: ffff888109fe0470 RCX: ffffffff99aba303
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
RBP: dffffc0000000000 R08: ffff888109fe047f R09: 1ffff110213fc08f
R10: dffffc0000000000 R11: ffffed10213fc090 R12: ffff888109fe0478
R13: ffff888109fe04d8 R14: 1ffff110213fc09b R15: dffffc0000000000
FS:  0000555565051500(0000) GS:ffff8881a3c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c41a24b CR3: 0000000119226000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 up_write+0x127/0x420
 f2fs_write_checkpoint+0x9de/0x1df0
 kill_f2fs_super+0x2c3/0x6c0
 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: 0033:0x7f2dfeb8ff17
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffdffd0b8f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f2dfec11c05 RCX: 00007f2dfeb8ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdffd0b9b0
RBP: 00007ffdffd0b9b0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffdffd0ca40
R13: 00007f2dfec11c05 R14: 000000000004cc1a R15: 00007ffdffd0ca80
 </TASK>
