INFO: task syz.3.1766:15341 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.3.1766      state:D stack:24616 pid:15341 tgid:15339 ppid:14948  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6ba/0x920
 down_read+0x9c/0x330
 super_lock+0x2d6/0x3d0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x538/0x9a0
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f47dc79e0d9
RSP: 002b:00007f47dd659028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f47dca25fa0 RCX: 00007f47dc79e0d9
RDX: 0000000000000000 RSI: 00002000000003c0 RDI: ffffffff80000800
RBP: 00007f47dc835024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000300 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f47dca26038 R14: 00007f47dca25fa0 R15: 00007ffd65442718
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/1:1/32:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90000a77c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffff8881a7fb5250 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x1fd/0x3b0
1 lock held by khungtaskd/35:
 #0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5425:
 #0: ffff8881719630a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034762e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
2 locks held by sshd/5583:
2 locks held by syz-executor/8537:
4 locks held by syz-executor/8691:
2 locks held by syz-executor/9857:
2 locks held by syz-executor/10607:
3 locks held by syz-executor/12159:
1 lock held by syz.3.1766/15341:
 #0: ffff88802ec640d8 (&type->s_umount_key#56){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz-executor/15500:
1 lock held by syz.2.1880/15912:
 #0: ffff88816f6120d8 (&type->s_umount_key#56){++++}-{4:4}, at: super_lock+0x289/0x3d0
1 lock held by syz.7.2150/17013:
 #0: ffff88802bf500d8 (&type->s_umount_key#56){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.1.2192/17211:
1 lock held by syz.4.2195/17205:
 #0: ffffffff8eb5ff68 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 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/0x380
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 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: 9857 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:_raw_spin_lock+0x0/0x40
Code: be 01 02 00 00 e8 c0 2e b6 f5 31 ed 89 e8 5b 41 5e 5d e9 c3 4a 00 00 cc 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 53 48 89 fb bf 01 00 00 00 e8 3e 1e c2 f5 48 8d 7b 18
RSP: 0018:ffffc900076f7838 EFLAGS: 00000246
RAX: ffffffff845796d4 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff88810b5d8000 RSI: 0000000000000000 RDI: ffff888013380c18
RBP: ffffc900076f7bb0 R08: ffff888013381107 R09: 1ffff11002670220
R10: dffffc0000000000 R11: ffffed1002670221 R12: ffff88811d006087
R13: ffff888013380b78 R14: 0000000000000000 R15: 0000000000000000
FS:  000055558a01a500(0000) GS:ffff88818d95c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c75b232598 CR3: 000000010cbaa000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 f2fs_write_checkpoint+0xb98/0x2710
 kill_f2fs_super+0x2f6/0x700
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x3d3/0x460
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0x1fa/0x730
 do_syscall_64+0x353/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7eff8a39f317
Code: a2 c7 05 dc 43 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:00007ffe496ed638 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007eff8a434474 RCX: 00007eff8a39f317
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe496ed6f0
RBP: 00007ffe496ed6f0 R08: 00007ffe496ee6f0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe496ee780
R13: 00007eff8a434474 R14: 00000000000501d9 R15: 00007ffe496ee7c0
 </TASK>
