INFO: task syz.4.248:7536 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.248       state:D stack:22304 pid:7536  tgid:7535  ppid:7070   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: 0033:0x7fb10fd9cdd9
RSP: 002b:00007fb110bb0028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fb110015fa0 RCX: 00007fb10fd9cdd9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000100
RBP: 00007fb10fe32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb110016038 R14: 00007fb110015fa0 R15: 00007ffc3a5dec28
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
5 locks held by kworker/u10:2/40:
2 locks held by getty/5438:
 #0: ffff88816fbe70a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029a82e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
2 locks held by syz-executor/5615:
2 locks held by syz-executor/7171:
 #0: ffff88810fc7a0d8 (&type->s_umount_key#76){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffffffff8edf8480 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520
1 lock held by syz.4.248/7536:
 #0: ffff8881ba7820d8 (&type->s_umount_key#56){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz-executor/8142:
 #0: ffff88802fc520d8 (&type->s_umount_key#76){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by syz.0.347/8312:
 #0: ffff8881ba7820d8 (&type->s_umount_key#56){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz-executor/9480:
 #0: ffff888176d220d8 (&type->s_umount_key#76){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffffffff8edf8480 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520
1 lock held by syz.5.594/9822:
 #0: ffff88810fc7a0d8 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
3 locks held by syz.4.606/9864:

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

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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd3/0x1030
 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: 5615 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+0xc4c/0x2cf0
Code: 48 ff cb f7 c1 00 60 00 00 74 c3 e9 90 00 00 00 48 c7 c7 90 b1 82 8e 4c 89 fe e8 cf 61 4d 03 48 8b 54 24 18 eb c3 48 8b 48 18 <48> 39 e9 0f 84 b9 00 00 00 48 8b 40 08 48 85 c0 0f 84 ca fe ff ff
RSP: 0018:ffffc9000469f0a0 EFLAGS: 00000046
RAX: ffffffff94596f70 RBX: 00000000000045fa RCX: 4488024cf8ae9b73
RDX: 000000001805bd00 RSI: 00000000adb5305f RDI: ffff88816e2b0000
RBP: 4488024cf8ae9b73 R08: ffffffff81b24743 R09: ffff88823c628298
R10: dffffc0000000000 R11: fffffbfff34de6f0 R12: ffff88816e2b0c30
R13: ffff88816e2b0c30 R14: ffff88816e2b0000 R15: 0000000000000004
FS:  000055558145b500(0000) GS:ffff8882a928d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f41993ff000 CR3: 00000001760bc000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lock_acquire+0x106/0x350
 _raw_spin_lock_irqsave+0x40/0x60
 hrtimer_start_range_ns+0xc3/0xed0
 finish_task_switch+0x3cd/0xbe0
 __schedule+0x1829/0x5740
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x14f/0x760
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_is_held_type+0x106/0x150
Code: 19 00 00 b8 ff ff ff ff 65 0f c1 05 74 ad 90 07 83 f8 01 75 25 9c 58 a9 00 02 00 00 75 39 41 f7 c4 00 02 00 00 74 01 fb 89 d8 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 90 0f 0b 90 48 c7
RSP: 0018:ffffc9000469f710 EFLAGS: 00000206
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8e219b60 RDI: ffffffff8c28af60
RBP: 00000000ffffffff R08: ffff8881753b50f3 R09: 1ffff1102ea76a1e
R10: dffffc0000000000 R11: ffffed102ea76a1f R12: 0000000000000246
R13: ffff88816e2b0000 R14: ffffffff8e95cdc0 R15: 0000000000000003
 __might_resched+0x37/0x4d0
 down_write+0x76/0x200
 f2fs_write_checkpoint+0xa10/0x26a0
 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: 0033:0x7f982659e017
Code: a2 c7 05 dc 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:00007fffc4f3d848 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f9826632120 RCX: 00007f982659e017
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffc4f3d900
RBP: 00007fffc4f3d900 R08: 00007fffc4f3e900 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffc4f3e990
R13: 00007f9826632120 R14: 0000000000012696 R15: 00007fffc4f3e9d0
 </TASK>
