INFO: task syz.6.445:8557 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.445       state:D stack:24776 pid:8557  tgid:8556  ppid:7135   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
 __iterate_supers+0x120/0x240
 __se_sys_quotactl+0x3a0/0x9a0
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb6c699ce59
RSP: 002b:00007fb6c7843028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fb6c6c15fa0 RCX: 00007fb6c699ce59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000101
RBP: 00007fb6c6a32e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb6c6c16038 R14: 00007fb6c6c15fa0 R15: 00007ffeedd63aa8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e959c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5434:
 #0: ffff88816fee90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
2 locks held by syz-executor/7772:
1 lock held by syz.6.445/8557:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.8.447/8957:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.9.452/9624:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.9.452/9663:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.1.449/9645:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.453/10059:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.453/10062:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.453/10066:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.461/10855:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.461/10861:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.465/10935:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.465/10941:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.4.467/11327:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.2.472/12016:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.6.474/12071:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.7.476/12391:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.7.476/12392:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.7.476/12393:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.8.482/12979:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.8.482/12982:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.1.487/13077:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.9.486/13395:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.489/13708:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.493/14293:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.493/14320:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.493/14321:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.491/14350:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.491/14351:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.4.494/14670:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.2.495/15256:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.6.498/15302:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.7.506/15643:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.8.507/16254:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.1.508/16287:
 #0: ffff8881727be0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 35 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+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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 7772 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:__lock_acquire+0xab5/0x2cf0
Code: 83 94 0e 48 c7 c6 98 87 10 8e 67 48 0f b9 3a 90 48 bb eb 83 b5 80 46 86 c8 61 48 0f af dd 48 c1 eb 2d 48 8b 04 dd 40 45 04 94 <48> 85 c0 74 1c 48 83 c0 f8 74 16 48 8b 48 18 48 39 e9 0f 84 bb 01
RSP: 0018:ffffc9000404f258 EFLAGS: 00000002
RAX: ffffffff947424d8 RBX: 0000000000020a97 RCX: 0000000000040000
RDX: 00000000c11a8e3b RSI: 000000002236f666 RDI: ffff88811053bb80
RBP: 1cef04960c34cd22 R08: ffffffff84427b80 R09: 0000000000000000
R10: 0000000000000000 R11: ffff888172e26138 R12: ffff88811053c770
R13: ffff88811053c770 R14: ffff88811053bb80 R15: 0000000000000002
FS:  000055559343f500(0000) GS:ffff8882a9218000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005616f7bf7598 CR3: 000000016a576000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lock_acquire+0x106/0x350
 down_read+0x4a/0x330
 f2fs_get_node_info+0x130/0x1ee0
 read_node_folio+0x21d/0x3d0
 __get_node_folio+0x3c7/0xdf0
 f2fs_update_inode_page+0x9d/0x360
 f2fs_write_checkpoint+0xc4c/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: 0033:0x7f6a9bd9e097
Code: a2 c7 05 5c 06 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:00007ffef55ba368 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f6a9be322ca RCX: 00007f6a9bd9e097
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffef55ba420
RBP: 00007ffef55ba420 R08: 00007ffef55bb420 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffef55bb4b0
R13: 00007f6a9be322ca R14: 000000000001ec72 R15: 00007ffef55bb4f0
 </TASK>
