INFO: task syz.5.1370:12048 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.5.1370      state:D stack:25008 pid:12048 tgid:12047 ppid:11369  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x16e2/0x53f0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61b/0x920
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x538/0x9d0
 do_syscall_64+0x170/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f309719e019
RSP: 002b:00007f3097fe2028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f3097425fa0 RCX: 00007f309719e019
RDX: 0000000000000000 RSI: 0000200000000240 RDI: ffffffff80000901
RBP: 00007f309723500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3097426038 R14: 00007f3097425fa0 R15: 00007ffd48c96fa8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e75d000 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5416:
 #0: ffff888176df70a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x13a0
3 locks held by syz-executor/5598:
2 locks held by syz-executor/7584:
3 locks held by syz-executor/7727:
2 locks held by syz-executor/9314:
3 locks held by syz-executor/9390:
3 locks held by syz-executor/10606:
1 lock held by syz.5.1370/12048:
 #0: ffff8881a79f60e0 (&type->s_umount_key#59){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.7.1579/12778:
 #0: ffff888176d3a0e0 (&type->s_umount_key#59){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz-executor/12883:
 #0: ffffffff8e7632b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770

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

NMI backtrace for cpu 0
CPU: 0 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+0xf9e/0xff0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 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: 7584 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_release+0x266/0x3d0
Code: 89 f6 48 8b 54 24 18 e8 38 2f 00 00 48 8b 5c 24 08 48 c7 c7 d8 cb 16 8e e8 67 a4 0d 0a b8 ff ff ff ff 65 0f c1 05 3a fb 7b 11 <83> f8 01 75 2e 9c 58 a9 00 02 00 00 75 42 f7 c3 00 02 00 00 75 47
RSP: 0018:ffffc90005947798 EFLAGS: 00000057
RAX: 0000000000000001 RBX: 0000000000000287 RCX: 0000000080000002
RDX: 0000000000000003 RSI: ffffffff8e16cbd8 RDI: ffffffff8c28adc0
RBP: ffff88810b35e450 R08: ffff888116d14b83 R09: 1ffff11022da2970
R10: dffffc0000000000 R11: ffffed1022da2971 R12: 0000000000000003
R13: 0000000000000003 R14: ffff888116d14a18 R15: ffff88810b35d880
FS:  0000555566633500(0000) GS:ffff8882a9452000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f451dbef2f8 CR3: 00000001109c4000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 _raw_spin_unlock+0x16/0x50
 igrab+0x13d/0x1e0
 f2fs_write_checkpoint+0xbe1/0x2810
 kill_f2fs_super+0x319/0x720
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x3d3/0x460
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0x18d/0x5e0
 do_syscall_64+0x357/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4d8c39f257
Code: a2 c7 05 9c 44 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:00007ffce9311958 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f4d8c43445c RCX: 00007f4d8c39f257
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffce9311a10
RBP: 00007ffce9311a10 R08: 00007ffce9312a10 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffce9312aa0
R13: 00007f4d8c43445c R14: 000000000002a08a R15: 00007ffce9312ae0
 </TASK>
