usb-fuzzer-gadget dummy_udc.0: failed to start USB fuzzer: -22
usb-fuzzer-gadget dummy_udc.0: failed to start USB fuzzer: -22
usb-fuzzer-gadget dummy_udc.0: failed to start USB fuzzer: -22
usb-fuzzer-gadget dummy_udc.0: failed to start USB fuzzer: -22
usb-fuzzer-gadget dummy_udc.0: failed to start USB fuzzer: -22
INFO: task kworker/0:1:12 blocked for more than 143 seconds.
      Not tainted 5.1.0-rc4-319354-g9a33b36 #3
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:1     D26944    12      2 0x80000000
Workqueue: usb_hub_wq hub_event
Call Trace:
 schedule+0x8f/0x180 kernel/sched/core.c:3562
 usb_kill_urb drivers/usb/core/urb.c:695 [inline]
 usb_kill_urb+0x22a/0x2c0 drivers/usb/core/urb.c:687
 usb_start_wait_urb+0x257/0x4d0 drivers/usb/core/message.c:63
usb-fuzzer-gadget dummy_udc.0: failed to start USB fuzzer: -22
 usb_internal_control_msg drivers/usb/core/message.c:101 [inline]
 usb_control_msg+0x321/0x4a0 drivers/usb/core/message.c:152
 hub_port_init+0x81d/0x2d30 drivers/usb/core/hub.c:4655
 hub_port_connect drivers/usb/core/hub.c:5021 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5204 [inline]
 port_event drivers/usb/core/hub.c:5350 [inline]
 hub_event+0x11b8/0x3b00 drivers/usb/core/hub.c:5432
 process_one_work+0x90f/0x1580 kernel/workqueue.c:2269
 worker_thread+0x9b/0xe20 kernel/workqueue.c:2415
 kthread+0x313/0x420 kernel/kthread.c:253
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

Showing all locks held in the system:
5 locks held by kworker/0:1/12:
 #0: 00000000a20c304c ((wq_completion)usb_hub_wq){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline]
 #0: 00000000a20c304c ((wq_completion)usb_hub_wq){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: 00000000a20c304c ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
 #0: 00000000a20c304c ((wq_completion)usb_hub_wq){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 #0: 00000000a20c304c ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data kernel/workqueue.c:619 [inline]
 #0: 00000000a20c304c ((wq_completion)usb_hub_wq){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline]
 #0: 00000000a20c304c ((wq_completion)usb_hub_wq){+.+.}, at: process_one_work+0x81f/0x1580 kernel/workqueue.c:2240
 #1: 000000008a010120 ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x853/0x1580 kernel/workqueue.c:2244
 #2: 000000000bde3edd (&dev->mutex){....}, at: device_lock include/linux/device.h:1207 [inline]
 #2: 000000000bde3edd (&dev->mutex){....}, at: hub_event+0x18a/0x3b00 drivers/usb/core/hub.c:5378
 #3: 00000000ba58df5d (&port_dev->status_lock){+.+.}, at: usb_lock_port drivers/usb/core/hub.c:2994 [inline]
 #3: 00000000ba58df5d (&port_dev->status_lock){+.+.}, at: hub_port_connect drivers/usb/core/hub.c:5020 [inline]
 #3: 00000000ba58df5d (&port_dev->status_lock){+.+.}, at: hub_port_connect_change drivers/usb/core/hub.c:5204 [inline]
 #3: 00000000ba58df5d (&port_dev->status_lock){+.+.}, at: port_event drivers/usb/core/hub.c:5350 [inline]
 #3: 00000000ba58df5d (&port_dev->status_lock){+.+.}, at: hub_event+0x11a3/0x3b00 drivers/usb/core/hub.c:5432
 #4: 00000000fcaca00e (hcd->address0_mutex){+.+.}, at: hub_port_init+0x1bb/0x2d30 drivers/usb/core/hub.c:4529
1 lock held by khungtaskd/23:
 #0: 000000001ce95d2d (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:5059
1 lock held by rsyslogd/5520:
2 locks held by getty/5610:
 #0: 00000000dca9af68 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x27/0x80 drivers/tty/tty_ldisc.c:272
 #1: 00000000699caa2f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21c/0x1a60 drivers/tty/n_tty.c:2156
2 locks held by getty/5611:
 #0: 00000000c6944690 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x27/0x80 drivers/tty/tty_ldisc.c:272
 #1: 00000000006fa3ea (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21c/0x1a60 drivers/tty/n_tty.c:2156
2 locks held by getty/5612:
 #0: 000000006e6dc6ea (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x27/0x80 drivers/tty/tty_ldisc.c:272
 #1: 00000000c9b488e9 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21c/0x1a60 drivers/tty/n_tty.c:2156
2 locks held by getty/5613:
 #0: 00000000dc5d18a0 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x27/0x80 drivers/tty/tty_ldisc.c:272
 #1: 000000005c89d17b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21c/0x1a60 drivers/tty/n_tty.c:2156
2 locks held by getty/5614:
 #0: 000000008af33d19 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x27/0x80 drivers/tty/tty_ldisc.c:272
 #1: 000000001ca186f2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21c/0x1a60 drivers/tty/n_tty.c:2156
2 locks held by getty/5615:
 #0: 00000000c2c072ba (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x27/0x80 drivers/tty/tty_ldisc.c:272
 #1: 00000000a5576aff (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21c/0x1a60 drivers/tty/n_tty.c:2156
2 locks held by getty/5616:
usb-fuzzer-gadget dummy_udc.0: failed to start USB fuzzer: -22
 #0: 000000005fc48879 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x27/0x80 drivers/tty/tty_ldisc.c:272
 #1: 00000000160beeff (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21c/0x1a60 drivers/tty/n_tty.c:2156

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

NMI backtrace for cpu 1
CPU: 1 PID: 23 Comm: khungtaskd Not tainted 5.1.0-rc4-319354-g9a33b36 #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xe8/0x16e lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x48/0x87 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1a6/0x1bd lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline]
 watchdog+0x98e/0xe20 kernel/hung_task.c:288
 kthread+0x313/0x420 kernel/kthread.c:253
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.1.0-rc4-319354-g9a33b36 #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rcu_lockdep_current_cpu_online kernel/rcu/tree.c:992 [inline]
RIP: 0010:rcu_lockdep_current_cpu_online+0x34/0xd0 kernel/rcu/tree.c:983
Code: a2 7e 81 e2 00 00 10 00 b8 01 00 00 00 0f 85 93 00 00 00 8b 15 e1 b8 6b 12 85 d2 0f 84 85 00 00 00 55 65 ff 05 cd d6 a2 7e 53 <48> c7 c3 80 e0 02 00 65 48 03 1d 65 6a a2 7e 48 8d 7b 18 48 b8 00
RSP: 0018:ffff8880ad007e08 EFLAGS: 00000082
RAX: 0000000000000001 RBX: ffffffff93cb0558 RCX: ffffffff815f050c
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff8880ad02e138
RBP: ffff8880ad025ac0 R08: ffffffff91688100 R09: ffffed1015a05c28
R10: ffffed1015a05c27 R11: ffff8880ad02e13b R12: ffff8880ad025b40
R13: ffff88809f9e7dd0 R14: dffffc0000000000 R15: 000000869cd3a9f2
FS:  0000000000000000(0000) GS:ffff8880ad000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f28d43b2000 CR3: 00000000960a6000 CR4: 00000000001406f0
Call Trace:
 <IRQ>
 rcu_read_lock_sched_held+0x97/0x130 kernel/rcu/update.c:102
 trace_hrtimer_cancel include/trace/events/timer.h:285 [inline]
 debug_deactivate kernel/time/hrtimer.c:463 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1359 [inline]
 __hrtimer_run_queues+0xa0c/0xbd0 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x2ed/0x740 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
 smp_apic_timer_interrupt+0xdd/0x4a0 arch/x86/kernel/apic/apic.c:1060
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
 </IRQ>
RIP: 0010:native_safe_halt+0x2/0x10 arch/x86/include/asm/irqflags.h:58
Code: 89 04 24 e8 70 b3 a2 f3 48 8b 04 24 e9 d9 fe ff ff 48 89 df e8 5f b3 a2 f3 eb 8a 90 90 90 90 90 90 90 90 90 90 90 90 90 fb f4 <c3> 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 f4 c3 90 90 90 90 90 90
RSP: 0018:ffffffff91607dc0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffffff9168893c
RBP: fffffbfff22d1020 R08: ffffffff91688100 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff91688100
R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff91688100
 arch_safe_halt arch/x86/include/asm/paravirt.h:156 [inline]
 default_idle+0x24/0x2b0 arch/x86/kernel/process.c:576
 cpuidle_idle_call kernel/sched/idle.c:153 [inline]
 do_idle+0x321/0x400 kernel/sched/idle.c:262
 cpu_startup_entry+0x19/0x20 kernel/sched/idle.c:353
 start_kernel+0x805/0x83d init/main.c:747
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243