INFO: task syz.9.725:19837 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.725       state:D stack:24712 pid:19837 tgid:19836 ppid:17680  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x5fd/0x8f0
 down_read+0x98/0x2e0
 super_lock+0x2a9/0x3b0
 __iterate_supers+0x126/0x290
 __se_sys_quotactl+0x353/0x950
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd54078efc9
RSP: 002b:00007fd5416fd038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fd5409e5fa0 RCX: 00007fd54078efc9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000101
RBP: 00007fd540811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd5409e6038 R14: 00007fd5409e5fa0 R15: 00007ffe78114d08
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8df3d2e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5640:
 #0: ffff8881149170a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900035762f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
4 locks held by syz-executor/8250:
1 lock held by syz.9.725/19837:
 #0: ffff88810ef5a0e0 (&type->s_umount_key#51){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.3.735/19923:
 #0: ffff88810ef5a0e0 (&type->s_umount_key#51){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz-executor/24436:
 #0: ffffffff8df42d78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730
3 locks held by syz-executor/25720:
3 locks held by syz.3.1105/28087:

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

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+0xf60/0xfa0
 kthread+0x711/0x8a0
 ret_from_fork+0x4bc/0x870
 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: 8250 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:in_lock_functions+0x0/0x30
Code: c7 d8 d7 75 95 e8 b0 d7 87 00 e9 61 ff ff ff cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 81 ff 70 a2 48 8b 0f 93 c0 48 81 ff 3d e8 48 8b 0f
RSP: 0018:ffffc90003edf4e0 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffffff8b47da54 RCX: ffffffff99796303
RDX: 0000000000000000 RSI: ffffffff8d8f29ba RDI: ffffffff8b47da54
RBP: 000000000000000a R08: 0000000000000000 R09: ffffffff8414b959
R10: ffffc90003edf5f4 R11: fffff520007dbec0 R12: ffff8881a8f30000
R13: dffffc0000000000 R14: ffffc90003edf5fd R15: dffffc0000000000
FS:  00005555855cf500(0000) GS:ffff8882a9f3e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbc9efb4198 CR3: 00000001a913a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 preempt_count_add+0x91/0x1a0
 down_read+0x54/0x2e0
 f2fs_get_node_info+0x119/0x1480
 read_node_folio+0x20a/0x3f0
 __get_node_folio+0x22a/0x14f0
 f2fs_update_inode_page+0x82/0x190
 f2fs_write_checkpoint+0xb4d/0x2440
 kill_f2fs_super+0x2cc/0x6d0
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xe9/0x130
 do_syscall_64+0x2bd/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6a1af902f7
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:00007ffeca1ecda8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f6a1b011d7d RCX: 00007f6a1af902f7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffeca1ece60
RBP: 00007ffeca1ece60 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffeca1edef0
R13: 00007f6a1b011d7d R14: 000000000003378e R15: 00007ffeca1edf30
 </TASK>
