INFO: task kworker/0:6:24969 blocked for more than 140 seconds.
      Not tainted 4.14.232-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:6     D28872 24969      2 0x80000000
Workqueue: usb_hub_wq hub_event
Call Trace:
 context_switch kernel/sched/core.c:2808 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3384
 schedule+0x8d/0x1b0 kernel/sched/core.c:3428
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893
 hub_port_init+0x15b/0x2970 drivers/usb/core/hub.c:4429
 hub_port_connect drivers/usb/core/hub.c:4905 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5088 [inline]
 port_event drivers/usb/core/hub.c:5194 [inline]
 hub_event+0x18fd/0x3d70 drivers/usb/core/hub.c:5274
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Showing all locks held in the system:
5 locks held by kworker/0:0/3:
 #0:  ("usb_hub_wq"){+.+.}, at: [<ffffffff813639b0>] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087
 #1:  ((&hub->events)){+.+.}, at: [<ffffffff813639e6>] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091
 #2:  (&dev->mutex){....}, at: [<ffffffff8444f578>] device_lock include/linux/device.h:1081 [inline]
 #2:  (&dev->mutex){....}, at: [<ffffffff8444f578>] hub_event+0x108/0x3d70 drivers/usb/core/hub.c:5220
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] usb_lock_port drivers/usb/core/hub.c:2934 [inline]
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] hub_port_connect drivers/usb/core/hub.c:4904 [inline]
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] hub_port_connect_change drivers/usb/core/hub.c:5088 [inline]
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] port_event drivers/usb/core/hub.c:5194 [inline]
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] hub_event+0x18e8/0x3d70 drivers/usb/core/hub.c:5274
 #4:  (hcd->address0_mutex){+.+.}, at: [<ffffffff8444507b>] hub_port_init+0x15b/0x2970 drivers/usb/core/hub.c:4429
1 lock held by khungtaskd/1533:
 #0:  (tasklist_lock){.+.+}, at: [<ffffffff8700b7b7>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548
5 locks held by kworker/0:2/4314:
 #0:  ("usb_hub_wq"){+.+.}, at: [<ffffffff813639b0>] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087
 #1:  ((&hub->events)){+.+.}, at: [<ffffffff813639e6>] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091
 #2:  (&dev->mutex){....}, at: [<ffffffff8444f578>] device_lock include/linux/device.h:1081 [inline]
 #2:  (&dev->mutex){....}, at: [<ffffffff8444f578>] hub_event+0x108/0x3d70 drivers/usb/core/hub.c:5220
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] usb_lock_port drivers/usb/core/hub.c:2934 [inline]
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] hub_port_connect drivers/usb/core/hub.c:4904 [inline]
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] hub_port_connect_change drivers/usb/core/hub.c:5088 [inline]
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] port_event drivers/usb/core/hub.c:5194 [inline]
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] hub_event+0x18e8/0x3d70 drivers/usb/core/hub.c:5274
 #4:  (hcd->address0_mutex){+.+.}, at: [<ffffffff8444507b>] hub_port_init+0x15b/0x2970 drivers/usb/core/hub.c:4429
5 locks held by kworker/0:3/7692:
 #0:  ("usb_hub_wq"){+.+.}, at: [<ffffffff813639b0>] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087
 #1:  ((&hub->events)){+.+.}, at: [<ffffffff813639e6>] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091
 #2:  (&dev->mutex){....}, at: [<ffffffff8444f578>] device_lock include/linux/device.h:1081 [inline]
 #2:  (&dev->mutex){....}, at: [<ffffffff8444f578>] hub_event+0x108/0x3d70 drivers/usb/core/hub.c:5220
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] usb_lock_port drivers/usb/core/hub.c:2934 [inline]
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] hub_port_connect drivers/usb/core/hub.c:4904 [inline]
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] hub_port_connect_change drivers/usb/core/hub.c:5088 [inline]
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] port_event drivers/usb/core/hub.c:5194 [inline]
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] hub_event+0x18e8/0x3d70 drivers/usb/core/hub.c:5274
 #4:  (hcd->address0_mutex){+.+.}, at: [<ffffffff8444507b>] hub_port_init+0x15b/0x2970 drivers/usb/core/hub.c:4429
5 locks held by kworker/0:4/9141:
 #0:  ("usb_hub_wq"){+.+.}, at: [<ffffffff813639b0>] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087
 #1:  ((&hub->events)){+.+.}, at: [<ffffffff813639e6>] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091
 #2:  (&dev->mutex){....}, at: [<ffffffff8444f578>] device_lock include/linux/device.h:1081 [inline]
 #2:  (&dev->mutex){....}, at: [<ffffffff8444f578>] hub_event+0x108/0x3d70 drivers/usb/core/hub.c:5220
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] usb_lock_port drivers/usb/core/hub.c:2934 [inline]
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] hub_port_connect drivers/usb/core/hub.c:4904 [inline]
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] hub_port_connect_change drivers/usb/core/hub.c:5088 [inline]
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] port_event drivers/usb/core/hub.c:5194 [inline]
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] hub_event+0x18e8/0x3d70 drivers/usb/core/hub.c:5274
 #4:  (hcd->address0_mutex){+.+.}, at: [<ffffffff8444507b>] hub_port_init+0x15b/0x2970 drivers/usb/core/hub.c:4429
5 locks held by kworker/0:6/24969:
 #0:  ("usb_hub_wq"){+.+.}, at: [<ffffffff813639b0>] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087
 #1:  ((&hub->events)){+.+.}, at: [<ffffffff813639e6>] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091
 #2:  (&dev->mutex){....}, at: [<ffffffff8444f578>] device_lock include/linux/device.h:1081 [inline]
 #2:  (&dev->mutex){....}, at: [<ffffffff8444f578>] hub_event+0x108/0x3d70 drivers/usb/core/hub.c:5220
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] usb_lock_port drivers/usb/core/hub.c:2934 [inline]
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] hub_port_connect drivers/usb/core/hub.c:4904 [inline]
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] hub_port_connect_change drivers/usb/core/hub.c:5088 [inline]
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] port_event drivers/usb/core/hub.c:5194 [inline]
 #3:  (&port_dev->status_lock){+.+.}, at: [<ffffffff84450d58>] hub_event+0x18e8/0x3d70 drivers/usb/core/hub.c:5274
 #4:  (hcd->address0_mutex){+.+.}, at: [<ffffffff8444507b>] hub_port_init+0x15b/0x2970 drivers/usb/core/hub.c:4429

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

NMI backtrace for cpu 1
CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.232-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline]
 watchdog+0x5b9/0xb40 kernel/hung_task.c:274
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 9485 Comm: syz-executor.5 Not tainted 4.14.232-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888017d961c0 task.stack: ffff88821e7a8000
RIP: 0033:0x41468a
RSP: 002b:00007ffd519f22b0 EFLAGS: 00000283
RAX: 00007faf4557f260 RBX: 00007faf454f3228 RCX: ffffffff8175148a
RDX: ffffffff8175148a RSI: 00007faf454f3230 RDI: ffffffff81751539
RBP: 00007faf454bdbb0 R08: 00007faf455e6320 R09: 0000001b2df2001c
R10: 00007ffd519f2540 R11: 0000000000000246 R12: 00007faf454bdba8
R13: 00007faf454f3228 R14: 00007faf454bdba0 R15: 000000000000001e
FS:  000000000215a400(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd519f1ff8 CR3: 00000002313cd000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400