INFO: task syz.7.1561:13613 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.1561      state:D stack:26200 pid:13613 tgid:13612 ppid:12267  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6d9/0x940
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x250
 __se_sys_quotactl+0x3a7/0x9e0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5e90f9ce59
RSP: 002b:00007f5e91e86028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f5e91215fa0 RCX: 00007f5e90f9ce59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000100
RBP: 00007f5e91032d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5e91216038 R14: 00007f5e91215fa0 R15: 00007fff0aac6888
 </TASK>
INFO: task syz.7.1561:13615 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.1561      state:D stack:27368 pid:13615 tgid:13612 ppid:12267  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6d9/0x940
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x250
 __se_sys_quotactl+0x3a7/0x9e0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5e90f9ce59
RSP: 002b:00007f5e91e65028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f5e91216090 RCX: 00007f5e90f9ce59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000101
RBP: 00007f5e91032d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5e91216128 R14: 00007f5e91216090 R15: 00007fff0aac6888
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e95cca0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5441:
 #0: ffff8881116160a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
2 locks held by syz-executor/10464:
1 lock held by syz.7.1561/13613:
 #0: ffff88810b56e0d8 (&type->s_umount_key#73){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.7.1561/13615:
 #0: ffff88810b56e0d8 (&type->s_umount_key#73){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.1804/16541:
 #0: ffff88810b56e0d8 (&type->s_umount_key#73){++++}-{4:4}, at: super_lock+0x289/0x3d0
1 lock held by syz.7.2354/21046:
 #0: ffff88810b56e0d8 (&type->s_umount_key#73){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.7.2354/21049:
 #0: ffff88810b56e0d8 (&type->s_umount_key#73){++++}-{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+0xfd3/0x1030
 kthread+0x389/0x470
 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: 10464 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+0x101/0x350
Code: 4c 89 7c 24 08 41 f7 c7 00 02 00 00 41 0f 94 c1 4c 89 ef 89 de 8b 54 24 04 44 89 e1 45 89 f0 6a 00 6a 00 6a 00 55 ff 74 24 30 <e8> da 02 00 00 48 83 c4 28 48 c7 c7 88 03 22 8e e8 4a ab 07 0a b8
RSP: 0018:ffffc900035bf380 EFLAGS: 00000006
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880207ac138
RBP: ffffffff843af51c R08: 0000000000000001 R09: 0000000000000000
R10: ffffc900035bf574 R11: fffff520006b7eb0 R12: 0000000000000001
R13: ffff8880207ac138 R14: 0000000000000001 R15: 0000000000000246
FS:  000055555a17a500(0000) GS:ffff8882a9289000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f64c75e8158 CR3: 0000000116f04000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 down_read+0x47/0x2e0
 f2fs_get_node_info+0x12c/0x1e20
 read_node_folio+0x221/0x410
 __get_node_folio+0x3ca/0xdd0
 f2fs_update_inode_page+0x83/0x2e0
 f2fs_write_checkpoint+0xbee/0x26a0
 kill_f2fs_super+0x314/0x730
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x437/0x4d0
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xf3/0x4d0
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faa6759e097
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:00007ffc8ffe8378 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007faa676321ca RCX: 00007faa6759e097
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc8ffe8430
RBP: 00007ffc8ffe8430 R08: 00007ffc8ffe9430 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc8ffe94c0
R13: 00007faa676321ca R14: 000000000003d645 R15: 00007ffc8ffe9500
 </TASK>
