INFO: task syz.6.1453:17862 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.1453      state:D stack:24696 pid:17862 tgid:17861 ppid:17623  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 schedule+0x164/0x360
 schedule_preempt_disabled+0x73/0xa0
 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: 0033:0x7faaa9d9cdd9
RSP: 002b:00007faaaad25028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007faaaa015fa0 RCX: 00007faaa9d9cdd9
RDX: 0000000000000000 RSI: 0000200000002200 RDI: ffffffff80000801
RBP: 00007faaa9e32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000002240 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faaaa016038 R14: 00007faaaa015fa0 R15: 00007ffd40e5b4a8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5437:
 #0: ffff888112ccd0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
3 locks held by syz-executor/15532:
2 locks held by syz-executor/15768:
2 locks held by syz-executor/15772:
2 locks held by syz-executor/16086:
1 lock held by syz.6.1453/17862:
 #0: ffff8881b52080d8 (&type->s_umount_key#65){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.9.1582/18557:
 #0: ffff888102ba40d8 (&type->s_umount_key#65){++++}-{4:4}, at: super_lock+0x289/0x3d0
1 lock held by syz.2.1684/19145:
 #0: ffff8881ad0a60d8 (&type->s_umount_key#65){++++}-{4:4}, at: super_lock+0x289/0x3d0
1 lock held by syz.3.1704/19343:
 #0: ffff8881136aa0d8 (&type->s_umount_key#65){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz-executor/19358:
3 locks held by syz.6.1736/19833:

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

NMI backtrace for cpu 0
CPU: 0 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+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: 15772 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+0x9b/0x150
Code: 90 0b 00 00 45 31 ff 49 83 ff 31 73 24 48 89 df 4c 89 f6 e8 f7 01 00 00 85 c0 75 2a 49 ff c7 49 63 85 88 0b 00 00 48 83 c3 28 <49> 39 c7 7c d8 eb 11 48 c7 c7 f0 b3 82 8e 4c 89 fe e8 2f 5b 46 f9
RSP: 0018:ffffc900076f7710 EFLAGS: 00000082
RAX: 0000000000000003 RBX: ffff888110eba938 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8e95ce20 RDI: ffff888110eba910
RBP: 00000000ffffffff R08: ffff8880223290f3 R09: 1ffff1100446521e
R10: dffffc0000000000 R11: ffffed100446521f R12: 0000000000000246
R13: ffff888110eb9d80 R14: ffffffff8e95ce20 R15: 0000000000000001
FS:  00005555597a1500(0000) GS:ffff8882a928d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557ce91a68 CR3: 000000001e6a8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __might_resched+0x86/0x4d0
 down_write+0x76/0x200
 f2fs_write_checkpoint+0xa10/0x26a0
 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: 0033:0x7f9aca39e017
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:00007ffcc66a10e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f9aca432120 RCX: 00007f9aca39e017
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffcc66a11a0
RBP: 00007ffcc66a11a0 R08: 00007ffcc66a21a0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcc66a2230
R13: 00007f9aca432120 R14: 0000000000066a77 R15: 00007ffcc66a2270
 </TASK>
