INFO: task syz.5.1916:20456 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.1916      state:D stack:25464 pid:20456 tgid:20455 ppid:18148  task_flags:0x400140 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: 0033:0x7f32d3d9cdd9
RSP: 002b:00007f32d4cf7028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f32d4015fa0 RCX: 00007f32d3d9cdd9
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: ffffffff80000601
RBP: 00007f32d3e32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000025a40 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f32d4016038 R14: 00007f32d4015fa0 R15: 00007fff7c441a48
 </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/5442:
 #0: ffff8881720e60a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900033a82e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
3 locks held by syz-executor/9824:
2 locks held by syz-executor/19761:
1 lock held by syz.5.1916/20456:
 #0: ffff8881752360d8 (&type->s_umount_key#55){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by udevd/22710:
1 lock held by syz.1.2161/23144:
2 locks held by syz.9.2164/23186:

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

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+0xfd3/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 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: 22710 Comm: udevd 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+0x42/0x190
Code: 44 9a 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 ea 00 00 00 83 3d 1e bd b0 18 00 75 07 65 8b 05 65 59 a5 11 65 01 3d 5e 59 a5 11 <48> c7 c0 e0 93 44 9a 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 e5 00
RSP: 0018:ffffc900071a7ca0 EFLAGS: 00000082
RAX: 0000000080000000 RBX: 0000000000000286 RCX: ffffffff9a449303
RDX: 0000000000000000 RSI: ffffffff8c28aec0 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff9030b3f7 R09: 1ffffffff206167e
R10: dffffc0000000000 R11: fffffbfff206167f R12: dffffc0000000000
R13: ffffffff9a66bde0 R14: ffffffff9a66bde8 R15: dffffc0000000000
FS:  00007f48cacbdc80(0000) GS:ffff88818dc8d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f743cad8000 CR3: 000000011dac2000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 _raw_spin_lock_irqsave+0x24/0x60
 debug_object_active_state+0x74/0x3a0
 call_rcu+0x5b/0x890
 kmem_cache_free+0x462/0x650
 fput_close_sync+0x11f/0x240
 __x64_sys_close+0x7e/0x110
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f48cad9737f
Code: af 6a 0d 00 f7 d8 64 89 02 48 83 c8 ff 44 89 c7 48 89 04 24 e8 e1 fc f9 ff 48 8b 04 24 48 83 c4 28 c3 c3 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 10 48 8b 15 7a 6a 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffdc7c45e18 EFLAGS: 00000202 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 00005562ebdbb260 RCX: 00007f48cad9737f
RDX: 00007f48cae6a860 RSI: 000000000000002c RDI: 0000000000000009
RBP: 0000000000000000 R08: 0000000000000004 R09: 0000000000000001
R10: 00000000000001b6 R11: 0000000000000202 R12: 0000000000000000
R13: 00007ffdc7c45e78 R14: 00007ffdc7c46278 R15: 00005562c520b160
 </TASK>
