INFO: task syz.5.824:11272 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.824       state:D stack:24696 pid:11272 tgid:11271 ppid:9906   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6d9/0x940
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x540/0x9e0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efe95d9cdd9
RSP: 002b:00007efe96d1e028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007efe96015fa0 RCX: 00007efe95d9cdd9
RDX: 0000000000000000 RSI: 00002000000003c0 RDI: ffffffff80000800
RBP: 00007efe95e32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000540 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efe96016038 R14: 00007efe96015fa0 R15: 00007ffd6eb70f68
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5441:
 #0: ffff8881757380a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000346b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
2 locks held by syz-executor/6666:
1 lock held by syz.5.824/11272:
 #0: ffff88811145c0d8 (&type->s_umount_key#59){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz-executor/11657:
3 locks held by syz.0.1171/14651:
2 locks held by syz.5.1173/14655:
2 locks held by syz.1.1176/14675:

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

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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd3/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 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: 6666 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:mark_lock+0x3c/0x190
Code: 00 03 00 83 f9 01 bb 09 00 00 00 83 db 00 83 fa 08 0f 45 da bd 01 00 00 00 89 d9 d3 e5 25 ff 1f 00 00 48 0f a3 05 94 03 9f 12 <73> 10 48 69 c0 c8 00 00 00 48 8d 88 70 03 e2 93 eb 42 83 3d 5b 93
RSP: 0018:ffffc90006847368 EFLAGS: 00000007
RAX: 00000000000008af RBX: 0000000000000002 RCX: 0000000000000002
RDX: 0000000000000002 RSI: ffff88816dd66460 RDI: ffff88816dd65880
RBP: 0000000000000004 R08: ffffffff82523dd4 R09: ffff88811634eb78
R10: ffffc90006847620 R11: fffff52000d08ef2 R12: 0000000000000004
R13: ffff88816dd66460 R14: ffff88816dd65880 R15: 0000000000000002
FS:  000055557422c500(0000) GS:ffff8882a928d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb9cdbbd000 CR3: 0000000170cba000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __lock_acquire+0x9d0/0x2cf0
 lock_acquire+0x106/0x350
 _raw_spin_lock+0x2e/0x40
 writeback_single_inode+0x34/0xdc0
 sync_inode_metadata+0x122/0x1d0
 f2fs_write_checkpoint+0xb93/0x26a0
 kill_f2fs_super+0x314/0x730
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x437/0x4d0
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xf3/0x4d0
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f29af39e017
Code: a2 c7 05 dc 06 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 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 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffccfe4c288 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f29af432120 RCX: 00007f29af39e017
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffccfe4c340
RBP: 00007ffccfe4c340 R08: 00007ffccfe4d340 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffccfe4d3d0
R13: 00007f29af432120 R14: 0000000000023ed8 R15: 00007ffccfe4d410
 </TASK>
