INFO: task syz.0.28:6057 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.28        state:D stack:27472 pid:6057  tgid:6056  ppid:5810   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x290
 __se_sys_quotactl+0x382/0x990
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc5cb39acb9
RSP: 002b:00007fc5cc20e028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fc5cb615fa0 RCX: 00007fc5cb39acb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000100
RBP: 00007fc5cb408bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc5cb616038 R14: 00007fc5cb615fa0 R15: 00007fff7982a038
 </TASK>
INFO: task syz.0.28:6058 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.28        state:D stack:28024 pid:6058  tgid:6056  ppid:5810   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x290
 __se_sys_quotactl+0x382/0x990
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc5cb39acb9
RSP: 002b:00007fc5cc1ed028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fc5cb616090 RCX: 00007fc5cb39acb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000101
RBP: 00007fc5cb408bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc5cb616128 R14: 00007fc5cb616090 R15: 00007fff7982a038
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e35a360 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5636:
 #0: ffff888111fb50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
3 locks held by syz-executor/5811:
1 lock held by syz.0.28/6057:
 #0: ffff8881047300e0 (&type->s_umount_key#83){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.28/6058:
 #0: ffff8881047300e0 (&type->s_umount_key#83){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.52/6370:
 #0: ffff8881047300e0 (&type->s_umount_key#83){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.52/6373:
 #0: ffff8881047300e0 (&type->s_umount_key#83){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.60/6424:
 #0: ffff8881047300e0 (&type->s_umount_key#83){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.60/6425:
 #0: ffff8881047300e0 (&type->s_umount_key#83){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.2.175/7853:
 #0: ffff8881047300e0 (&type->s_umount_key#83){++++}-{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/0x300
 sys_info+0x135/0x170
 watchdog+0xf90/0xfe0
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 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: 5811 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:check_preemption_disabled+0x1d/0xe0
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 53 65 8b 05 c7 b6 56 07 65 8b 0d bc b6 56 07 f7 c1 ff ff ff 7f 74 0c 5b <41> 5e 41 5f 5d e9 59 c7 02 00 cc 9c 59 f7 c1 00 02 00 00 74 ea 65
RSP: 0018:ffffc900048673e0 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8be738e0 RDI: ffffffff8be738a0
RBP: ffffffff84221879 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc900048675d4 R11: fffff5200090cebc R12: 0000000000000001
R13: ffff8881091af130 R14: 0000000000000000 R15: 0000000000000001
FS:  000055556e0e4500(0000) GS:ffff8882a9926000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001f50 CR3: 0000000111b2e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 rcu_is_watching+0x15/0xb0
 lock_acquire+0x5f/0x330
 down_read+0x47/0x2e0
 f2fs_get_node_info+0x119/0x1480
 read_node_folio+0x221/0x410
 __get_node_folio+0x23b/0x1540
 f2fs_update_inode_page+0x82/0x190
 f2fs_write_checkpoint+0xbd5/0x2490
 kill_f2fs_super+0x308/0x710
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x437/0x4d0
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xed/0x480
 do_syscall_64+0x2b7/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7b40d9bf17
Code: a2 c7 05 7c 96 24 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:00007ffdf7f0a278 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f7b40e0471f RCX: 00007f7b40d9bf17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdf7f0a330
RBP: 00007ffdf7f0a330 R08: 0000000000000000 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdf7f0b3c0
R13: 00007f7b40e0471f R14: 000000000000f817 R15: 00007ffdf7f0b400
 </TASK>
