INFO: task syz.5.2579:17840 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.2579      state:D stack:24888 pid:17840 tgid:17839 ppid:17539  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x149b/0x4fd0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x5fd/0x8f0
 down_read+0x99/0x2e0
 super_lock+0x2a9/0x3b0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x4da/0x950
 do_syscall_64+0xec/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fde0db8f7c9
RSP: 002b:00007fde0e9f9038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fde0dde5fa0 RCX: 00007fde0db8f7c9
RDX: 0000000000000000 RSI: 00002000000014c0 RDI: ffffffff80000501
RBP: 00007fde0dbf297f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fde0dde6038 R14: 00007fde0dde5fa0 R15: 00007ffdbe25a348
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8df41a20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5659:
 #0: ffff888177a840a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x449/0x1460
2 locks held by syz-executor/15011:
1 lock held by syz.5.2579/17840:
 #0: ffff88811f6b20e0 (&type->s_umount_key#87){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.0.2802/19079:
 #0: ffff88811f6b20e0 (&type->s_umount_key#87){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.5.3310/21939:
 #0: ffff88811f6b20e0 (&type->s_umount_key#87){++++}-{4:4}, at: super_lock+0x2a9/0x3b0

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xf95/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x510/0xa50
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 15011 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:lock_is_held_type+0x62/0x150
Code: 41 83 bd 2c 0b 00 00 00 0f 85 bf 00 00 00 89 f5 49 89 fe 9c 41 5c fa 48 c7 c7 3a 67 7a 8d e8 05 19 00 00 65 ff 05 1e c2 26 07 <41> 83 bd 28 0b 00 00 00 7e 48 4c 89 eb 48 81 c3 30 0b 00 00 45 31
RSP: 0018:ffffc900081ef7e0 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 00000000ffffffff RCX: 0000000000000046
RDX: ffff88816f7aba80 RSI: ffffffff8d7a673a RDI: ffffffff8bc084e0
RBP: 00000000ffffffff R08: ffff88816f7aba80 R09: 0000000000000003
R10: 00000000fffffffe R11: 0000000000000000 R12: 0000000000000246
R13: ffff88816f7aba80 R14: ffff88811692b698 R15: 1ffffffff1f04a54
FS:  000055555df55500(0000) GS:ffff88818e81f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f515ebb7198 CR3: 00000001a9fbe000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 iput+0xdf/0x1030
 f2fs_write_checkpoint+0xb56/0x2430
 kill_f2fs_super+0x2d2/0x6c0
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xef/0x4e0
 do_syscall_64+0x2b7/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efced590af7
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:00007ffd9b377908 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007efced5ee72f RCX: 00007efced590af7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd9b3779c0
RBP: 00007ffd9b3779c0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd9b378a50
R13: 00007efced5ee72f R14: 0000000000054a56 R15: 00007ffd9b378a90
 </TASK>
