INFO: task syz.5.1043:10777 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.1043      state:D stack:25160 pid:10777 tgid:10776 ppid:10348  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x872/0xfe0
 down_write+0x1ab/0x1f0
 super_lock+0x25c/0x3b0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x4da/0x950
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4f02d8eec9
RSP: 002b:00007f4f03cf6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f4f02fe5fa0 RCX: 00007f4f02d8eec9
RDX: 000000000000ee00 RSI: 0000200000000180 RDI: ffffffff80000300
RBP: 00007f4f02e11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 8cffffff00000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4f02fe6038 R14: 00007f4f02fe5fa0 R15: 00007fffb53b8248
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e13d2e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5637:
 #0: ffff8881022e10a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
5 locks held by kworker/0:3/5846:
 #0: ffff8881062c2948 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90004b87ba0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff88810a8d7198 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4a20
 #3: ffff88816efa2518 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_event+0x21b8/0x4a20
 #4: ffff888105fe7368 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_event+0x21e5/0x4a20
2 locks held by syz-executor/6410:
1 lock held by syz.5.1043/10777:
 #0: ffff8881128520e0 (&type->s_umount_key#66){++++}-{4:4}, at: super_lock+0x25c/0x3b0
1 lock held by syz-executor/12597:
 #0: ffff8881a986e0e0 (&type->s_umount_key#74){++++}-{4:4}, at: deactivate_super+0xa9/0xe0

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

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+0xf60/0xfa0
 kthread+0x711/0x8a0
 ret_from_fork+0x4bc/0x870
 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: 6410 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_release+0x2a2/0x3e0
Code: ae 09 b8 ff ff ff ff 65 0f c1 05 09 db f3 10 83 f8 01 75 51 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 <75> 56 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 8b 9a f3 10 48 3b 44
RSP: 0018:ffffc90003e975b8 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000206 RCX: e60eb160a01ea500
RDX: 0000000000000000 RSI: ffffffff8d9d1510 RDI: ffffffff8bc076e0
RBP: ffff88810f4a8b80 R08: 0000000000000000 R09: ffffffff8244ff1e
R10: 0000000000000000 R11: ffffed102d83200f R12: 0000000000000003
R13: 0000000000000003 R14: ffff88816c1900d8 R15: ffff88810f4a8000
FS:  0000555587778500(0000) GS:ffff8882a9d0c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffab35db78 CR3: 0000000173d94000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 _raw_spin_unlock+0x16/0x50
 writeback_single_inode+0x3c0/0x6a0
 sync_inode_metadata+0xb9/0x110
 f2fs_write_checkpoint+0xaf2/0x2440
 kill_f2fs_super+0x2cc/0x6d0
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xe9/0x130
 do_syscall_64+0x2bd/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff3241901f7
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:00007ffc531041a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007ff324211d7d RCX: 00007ff3241901f7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc53104260
RBP: 00007ffc53104260 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc531052f0
R13: 00007ff324211d7d R14: 0000000000018b58 R15: 00007ffc53105330
 </TASK>
