INFO: task syz-executor:737 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:21768 pid:737   tgid:737   ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1350
 lmLogClose+0xb4/0x520
 jfs_umount+0x2ef/0x3c0
 jfs_put_super+0x8c/0x190
 generic_shutdown_super+0x135/0x2c0
 kill_block_super+0x44/0x90
 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: 0033:0x7f9041190a77
RSP: 002b:00007fff3792b6d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f9041213d7d RCX: 00007f9041190a77
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff3792b790
RBP: 00007fff3792b790 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff3792c820
R13: 00007f9041213d7d R14: 0000000000142d70 R15: 00007fff3792c860
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/1:0/24:
 #0: ffff888166b08548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900001e7ba0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff88810bddf198 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4a20
 #3: ffff88816f6e7198 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x400
1 lock held by khungtaskd/36:
 #0: ffffffff8df3d6a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5637:
 #0: ffff8881604e10a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
2 locks held by syz-executor/32679:
 #0: ffff888023ac60e0 (&type->s_umount_key#66){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffffffff8e37d248 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520
2 locks held by syz-executor/573:
 #0: ffff8881186b40e0 (&type->s_umount_key#66){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffffffff8e37d248 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520
2 locks held by syz-executor/737:
 #0: ffff8881b6e3e0e0 (&type->s_umount_key#66){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffffffff8e37d248 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 36 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: 0 Comm: swapper/1 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:pv_native_safe_halt+0x13/0x20
Code: 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 eb 07 0f 00 2d f3 c1 20 00 f3 0f 1e fa fb f4 <e9> 48 e7 02 00 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000197de0 EFLAGS: 00000286
RAX: 446d950699750500 RBX: ffffffff81968e07 RCX: 446d950699750500
RDX: 0000000000000001 RSI: ffffffff8d70edfe RDI: ffffffff8bbf0f60
RBP: ffffc90000197f10 R08: ffff88823c632fdb R09: 1ffff110478c65fb
R10: dffffc0000000000 R11: ffffed10478c65fc R12: ffffffff8f7cf770
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff1102c154000
FS:  0000000000000000(0000) GS:ffff8882a9f36000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005603d4c231a8 CR3: 00000001bc0ee000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 default_idle+0x13/0x20
 default_idle_call+0x73/0xb0
 do_idle+0x1e7/0x510
 cpu_startup_entry+0x44/0x60
 start_secondary+0x101/0x110
 common_startup_64+0x13e/0x147
 </TASK>
vkms_vblank_simulate: vblank timer overrun
