INFO: task syz-executor:21508 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:22520 pid:21508 tgid:21508 ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7f5/0x1550
 lmLogClose+0xb4/0x520
 jfs_umount+0x2fb/0x3d0
 jfs_put_super+0x8c/0x190
 generic_shutdown_super+0x13d/0x2d0
 kill_block_super+0x44/0x90
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x437/0x4d0
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xed/0x480
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f235f99e017
RSP: 002b:00007ffcd966b6a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f235fa32120 RCX: 00007f235f99e017
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffcd966b760
RBP: 00007ffcd966b760 R08: 00007ffcd966c760 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcd966c7f0
R13: 00007f235fa32120 R14: 00000000000bec35 R15: 00007ffcd966c830
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/0:1/10:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc900000f7c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffff8881a9327230 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x202/0x3d0
1 lock held by khungtaskd/35:
 #0: ffffffff8e95cce0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5641:
 #0: ffff88816e73a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000346b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
4 locks held by kworker/u8:5/13446:
 #0: ffff8881012b5940 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc90003c67c40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffffffff8fdd10e8 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf4/0x800
 #3: ffff88810ff25550 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_destruct+0x116/0x310
2 locks held by syz-executor/21483:
 #0: ffff88810d2960d8 (&type->s_umount_key#81){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffffffff8edf7360 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520
2 locks held by syz-executor/21508:
 #0: ffff888176d340d8 (&type->s_umount_key#81){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffffffff8edf7360 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520
2 locks held by syz-executor/21561:
 #0: ffff8881193200d8 (&type->s_umount_key#81){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffffffff8edf7360 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520
1 lock held by syz.6.2365/22756:
 #0: ffff88810d2960d8 (&type->s_umount_key#81){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.2483/23158:
 #0: ffff88810d2960d8 (&type->s_umount_key#81){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.1.2586/23453:
 #0: ffff8881193200d8 (&type->s_umount_key#81){++++}-{4:4}, at: super_lock+0x289/0x3d0
1 lock held by syz.8.2614/23519:
 #0: ffff888176d340d8 (&type->s_umount_key#81){++++}-{4:4}, at: super_lock+0x289/0x3d0
2 locks held by syz-executor/23691:
 #0: ffff8881bb8ea0d8 (&type->s_umount_key#81){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffffffff8edf7360 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520
1 lock held by syz.0.2866/24445:
 #0: ffff88810d2960d8 (&type->s_umount_key#81){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.2866/24449:
 #0: ffff88810d2960d8 (&type->s_umount_key#81){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz-executor/24464:
 #0: ffff8881908140d8 (&type->s_umount_key#81){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffffffff8edf7360 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520
1 lock held by syz-executor/24894:
 #0: ffffffff8e962fe8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by dhcpcd-run-hook/24954:

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

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+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: 24936 Comm: syz.3.2882 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:debug_lockdep_rcu_enabled+0x29/0x40
Code: 90 f3 0f 1e fa 31 c0 83 3d 63 10 7d 04 00 74 1d 83 3d 1a 42 7d 04 00 74 14 65 48 8b 0d 58 85 89 07 31 c0 83 b9 8c 0b 00 00 00 <0f> 94 c0 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc
RSP: 0018:ffffc900027af8e0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88816c6cd880
RDX: 0000000000000000 RSI: 0000000000000d91 RDI: ffffffff8bda7a00
RBP: 0000000000000158 R08: ffff88823c641003 R09: 1ffff110478c8200
R10: dffffc0000000000 R11: ffffed10478c8201 R12: ffff888173a532a0
R13: ffffea0005eb55c0 R14: ffff888173a532ac R15: 0000000000000000
FS:  00007f2e3aa5b6c0(0000) GS:ffff8882a9225000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561658930a18 CR3: 000000000e74a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __might_resched+0x22/0x4d0
 vfree+0x1e4/0x2f0
 kcov_close+0x28/0x50
 __fput+0x44f/0xa60
 task_work_run+0x1d9/0x270
 do_exit+0x70f/0x22c0
 do_group_exit+0x21b/0x2d0
 get_signal+0x1284/0x1330
 arch_do_signal_or_restart+0xbc/0x830
 exit_to_user_mode_loop+0x86/0x480
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2e39b5d60e
Code: Unable to access opcode bytes at 0x7f2e39b5d5e4.
RSP: 002b:00007f2e3aa5ada8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00007f2e3aa5b6c0 RCX: 00007f2e39b5d60e
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007f2e3aa5aee0 R14: 00007f2e3aa5aea0 R15: 00007f2e2f800000
 </TASK>
