INFO: task syz.3.354:8799 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.354       state:D stack:24696 pid:8799  tgid:8798  ppid:8601   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6d9/0x940
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x250
 __se_sys_quotactl+0x3a7/0x9e0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f70d0d9cdd9
RSP: 002b:00007f70d1c12028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f70d1015fa0 RCX: 00007f70d0d9cdd9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000100
RBP: 00007f70d0e32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f70d1016038 R14: 00007f70d1015fa0 R15: 00007ffe993e2678
 </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/5436:
 #0: ffff8881128340a0 (&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
3 locks held by syz-executor/7104:
1 lock held by syz.3.354/8799:
 #0: ffff88816f8300d8 (&type->s_umount_key#60){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz-executor/8935:
1 lock held by syz.2.478/10010:
 #0: ffff88816f8300d8 (&type->s_umount_key#60){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz.6.712/12056:
2 locks held by syz.5.717/12070:

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

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: 7104 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:__might_sleep+0x31/0xf0
Code: 41 56 41 55 41 54 53 50 49 bf 00 00 00 00 00 fc ff df 65 48 8b 1d 07 8f a3 11 4c 8d 73 18 4c 89 f0 48 c1 e8 03 42 0f b6 04 38 <84> c0 0f 85 81 00 00 00 41 8b 2e 85 ed 74 2f 48 81 c3 18 18 00 00
RSP: 0018:ffffc90006777760 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: ffff8881073fbb00 RCX: 0000000000000000
RDX: ffff8881073fbb00 RSI: 0000000000000658 RDI: ffffffff8bcce5a0
RBP: ffffc90006777830 R08: ffff8881700b10f3 R09: 1ffff1102e01621e
R10: dffffc0000000000 R11: ffffed102e01621f R12: 1ffff92000ceeef4
R13: dffffc0000000000 R14: ffff8881073fbb18 R15: dffffc0000000000
FS:  00005555697ea500(0000) GS:ffff8882a9290000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f137afff000 CR3: 00000001158e2000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 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+0xed/0x480
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f374c59e017
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:00007ffddd32d818 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f374c632120 RCX: 00007f374c59e017
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffddd32d8d0
RBP: 00007ffddd32d8d0 R08: 00007ffddd32e8d0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffddd32e960
R13: 00007f374c632120 R14: 0000000000021c75 R15: 00007ffddd32e9a0
 </TASK>
