INFO: task syz-executor:5809 blocked for more than 144 seconds.
      Not tainted syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:20056 pid:5809  tgid:5809  ppid:1      task_flags:0x40014c flags:0x00080001
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 wb_wait_for_completion+0x15f/0x260
 sync_inodes_sb+0x1bb/0xa10
 sync_filesystem+0x17a/0x230
 generic_shutdown_super+0x6f/0x2c0
 kill_block_super+0x44/0x90
 ext4_kill_sb+0x68/0xb0
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 do_exit+0x6b5/0x2300
 do_group_exit+0x21c/0x2d0
 __x64_sys_exit_group+0x3f/0x40
 x64_sys_call+0x21f7/0x2200
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f46fe38f749
RSP: 002b:00007ffec44c0d88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f46fe413def RCX: 00007f46fe38f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000010 R08: 00007ffec44beb26 R09: 00007ffec44c2040
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffec44c2040
R13: 00007f46fe413d7d R14: 00005555647db4a8 R15: 00007ffec44c3110
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/1:0/24:
 #0: ffff88823c63a058 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
 #1: ffff88823c624048 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880
 #2: ffffffff8df3d700 (rcu_read_lock_bh){....}-{1:3}, at: wg_packet_tx_worker+0x24a/0x7c0
 #3: ffffffff997e23c8 (&____s->seqcount#2){----}-{0:0}, at: ktime_get+0x45/0x200
1 lock held by khungtaskd/35:
 #0: ffffffff8df3d6a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
5 locks held by kworker/u10:4/1089:
2 locks held by getty/5638:
 #0: ffff8881146b20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000357b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
2 locks held by syz-executor/5809:
 #0: ffff8881157c20e0 (&type->s_umount_key#31){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffff88816ba04820 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x19f/0xa10
1 lock held by syz.4.1758/10633:
 #0: ffff88810ffd0078 (&hiddev->existancelock){+.+.}-{4:4}, at: hiddev_ioctl+0x148/0x1670

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

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+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: 1089 Comm: kworker/u10:4 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
Workqueue: writeback wb_workfn (flush-7:2)
RIP: 0010:check_preemption_disabled+0x12/0x120
Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 53 48 83 ec 10 65 48 8b 05 de 04 27 07 <48> 89 44 24 08 65 8b 05 e6 04 27 07 65 8b 0d db 04 27 07 f7 c1 ff
RSP: 0018:ffffc90000a086e8 EFLAGS: 00000086
RAX: 66250b4bad1b8400 RBX: 0000000000000000 RCX: 66250b4bad1b8400
RDX: 0000000000000000 RSI: ffffffff8d8f5903 RDI: ffffffff8bbf0fe0
RBP: ffffffff8493c53b R08: 0000000000000000 R09: ffffffff8493c53b
R10: ffffc90000a08870 R11: fffff52000141110 R12: 0000000000000000
R13: ffffffff99a71c58 R14: 0000000000000001 R15: 0000000000000046
FS:  0000000000000000(0000) GS:ffff8882a9f36000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000f000 CR3: 000000010d7a6000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lock_acquire+0x130/0x360
 _raw_spin_lock_irqsave+0xa7/0xf0
 debug_object_activate+0xbb/0x420
 enqueue_hrtimer+0x30/0x3a0
 hrtimer_start_range_ns+0xcea/0x1080
 dummy_timer+0x42e5/0x44c0
 __hrtimer_run_queues+0x52c/0xc60
 hrtimer_run_softirq+0x187/0x2b0
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:deref_stack_reg+0x54/0x230
Code: 49 c1 ec 03 41 80 3c 34 00 4c 89 04 24 74 16 48 89 df e8 ff 5f b2 00 4c 8b 04 24 48 be 00 00 00 00 00 fc ff df 48 89 5c 24 10 <49> 8b 5f 08 4d 8d 77 10 4d 89 f5 49 c1 ed 03 41 80 7c 35 00 00 74
RSP: 0018:ffffc900076fe6e0 EFLAGS: 00000246
RAX: fffffffffffffff0 RBX: ffffc900076fe870 RCX: 0000000000000000
RDX: ffffc900076fe8a8 RSI: dffffc0000000000 RDI: ffffc900076fe868
RBP: dffffc0000000000 R08: ffffc900076fe8f0 R09: 0000000000000000
R10: ffffc900076fe8b8 R11: fffff52000edfd19 R12: 1ffff92000edfd0e
R13: ffffc900076fe8b8 R14: ffffc900076fe868 R15: ffffc900076fe868
 unwind_next_frame+0x17c4/0x2390
 __unwind_start+0x5b9/0x760
 arch_stack_walk+0xe4/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x37d/0x700
 ext4_init_io_end+0x29/0x130
 ext4_do_writepages+0xc7c/0x4610
 ext4_writepages+0x205/0x350
 do_writepages+0x32e/0x550
 __writeback_single_inode+0x145/0xff0
 writeback_sb_inodes+0x6c7/0x1010
 wb_writeback+0x43b/0xaf0
 wb_workfn+0x409/0xef0
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
kye 0003:0458:5016.0010: usb_submit_urb(ctrl) failed: -1
