INFO: task syz.1.1375:12619 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.1375      state:D stack:25128 pid:12619 tgid:12618 ppid:11944  task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x872/0xfe0
 down_write+0x1ab/0x1f0
 super_lock+0x25c/0x3b0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x4da/0x950
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4b4778eba9
RSP: 002b:00007f4b486b7038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f4b479d5fa0 RCX: 00007f4b4778eba9
RDX: 0000000000000000 RSI: 0000200000000300 RDI: ffffffff80000300
RBP: 00007f4b47811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4b479d6038 R14: 00007f4b479d5fa0 R15: 00007ffd92794448
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e139f20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5674:
 #0: ffff88802701d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
2 locks held by syz-executor/5846:
2 locks held by syz-executor/5850:
2 locks held by syz-executor/5853:
2 locks held by syz-executor/6039:
2 locks held by kworker/u8:4/6162:
2 locks held by syz-executor/11398:
 #0: ffff888029d020e0 (&type->s_umount_key#52){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffffffff8e13f880 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x570
1 lock held by syz.1.1375/12619:
 #0: ffff88811fb400e0 (&type->s_umount_key#52){+.+.}-{4:4}, at: super_lock+0x25c/0x3b0
1 lock held by syz.0.1752/14069:
 #0: ffff8881206ae0e0 (&type->s_umount_key#52){+.+.}-{4:4}, at: super_lock+0x25c/0x3b0
1 lock held by syz.2.1779/14157:
 #0: ffff88811fea60e0 (&type->s_umount_key#52){+.+.}-{4:4}, at: super_lock+0x25c/0x3b0
1 lock held by syz.5.1854/14632:
 #0: ffffffff8e13f9b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730

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

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+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 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: 5853 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:reacquire_held_locks+0x18e/0x1d0
Code: 78 ba 8d 48 c7 c6 b2 00 b4 8d e8 cd a6 e5 ff 90 0f 0b 90 90 90 31 c0 65 48 8b 0d 7d 0c 03 11 48 3b 4c 24 08 75 12 48 83 c4 10 <5b> 41 5c 41 5e 41 5f 5d c3 cc cc cc cc cc e8 2f 83 dc 09 49 89 ff
RSP: 0018:ffffc900031ff628 EFLAGS: 00000086
RAX: 0000000000000000 RBX: ffffc900031ff678 RCX: eecc436837442700
RDX: 0000000000000000 RSI: ffff8880225d8b40 RDI: ffff8880225d8000
RBP: 00000000ffffffff R08: 0000000000000000 R09: ffffffff824207c8
R10: 0000000000000000 R11: ffffed100426240f R12: 0000000000000003
R13: 0000000000000003 R14: ffff8880225d8bb4 R15: 00000000ffffffff
FS:  000055555e8f1500(0000) GS:ffff8881a3c15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557a64a5c8 CR3: 000000010af6e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lock_release+0x1b4/0x3e0
 _raw_spin_unlock+0x16/0x50
 writeback_single_inode+0x3ba/0x6a0
 sync_inode_metadata+0xb9/0x110
 f2fs_write_checkpoint+0xb06/0x1df0
 kill_f2fs_super+0x2c3/0x6c0
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff75ad8fed7
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 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 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffe9844cd78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007ff75ae11c05 RCX: 00007ff75ad8fed7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe9844ce30
RBP: 00007ffe9844ce30 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe9844dec0
R13: 00007ff75ae11c05 R14: 000000000000fcec R15: 00007ffe9844df00
 </TASK>
