INFO: task syz.4.5747:32016 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.5747      state:D stack:26344 pid:32016 tgid:32014 ppid:31809  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x5300
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x540/0x9e0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5dd999c799
RSP: 002b:00007f5dda883028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f5dd9c15fa0 RCX: 00007f5dd999c799
RDX: 0000000000000000 RSI: 0000200000000f00 RDI: ffffffff80000402
RBP: 00007f5dd9a32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000001000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5dd9c16038 R14: 00007f5dd9c15fa0 R15: 00007fffd1c1c348
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e75e560 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5636:
 #0: ffff888112b9b0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
2 locks held by syz-executor/28464:
2 locks held by syz-executor/28480:
2 locks held by syz-executor/30191:
2 locks held by syz-executor/30337:
2 locks held by syz-executor/31776:
1 lock held by syz.4.5747/32016:
 #0: ffff88816c8420e0 (&type->s_umount_key#83){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz-executor/32317:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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+0xfd9/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 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: 31776 Comm: syz-executor Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__lock_acquire+0x6db/0x2cf0
Code: 6b 44 00 00 31 ed 85 c0 0f 84 6d 0d 00 00 83 3d 3a a9 85 18 00 75 13 48 63 44 24 18 48 0f a3 05 4b 19 82 12 0f 83 8a 1e 00 00 <49> 8b 9e 48 0b 00 00 48 83 7c 24 28 00 75 19 83 3d 0f a9 85 18 00
RSP: 0018:ffffc9000705f5e0 EFLAGS: 00000047
RAX: 0000000000000c1d RBX: ffff888101709d40 RCX: ffffffff93ce1ab8
RDX: 0000000000000008 RSI: ffff88810170a8e8 RDI: ffff888101709d40
RBP: 0000000000000000 R08: ffffffff84300ec7 R09: ffff8881a254c3f0
R10: dffffc0000000000 R11: ffffed1033300168 R12: 0000000000000004
R13: ffff88810170a8e8 R14: ffff888101709d40 R15: 0000000000000002
FS:  000055555f3f9500(0000) GS:ffff88818de63000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32c16ff8 CR3: 000000001eb78000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lock_acquire+0xf0/0x2e0
 down_write+0x96/0x200
 f2fs_write_checkpoint+0x607/0x26a0
 kill_f2fs_super+0x314/0x720
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x437/0x4d0
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xed/0x480
 do_syscall_64+0x32d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcb0459d9d7
Code: a2 c7 05 1c fd 24 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:00007ffebaf1f218 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fcb04632050 RCX: 00007fcb0459d9d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffebaf1f2d0
RBP: 00007ffebaf1f2d0 R08: 00007ffebaf202d0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffebaf20360
R13: 00007fcb04632050 R14: 0000000000132f72 R15: 00007ffebaf203a0
 </TASK>
