INFO: task kworker/0:5:4434 blocked for more than 143 seconds.
      Not tainted 5.5.0-rc7-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:5     D23264  4434      2 0x80004000
Workqueue: usb_hub_wq hub_event
Call Trace:
 schedule+0xcd/0x2b0 kernel/sched/core.c:4155
 schedule_timeout+0x682/0xb20 kernel/time/timer.c:1871
 do_wait_for_common kernel/sched/completion.c:83 [inline]
 __wait_for_common kernel/sched/completion.c:104 [inline]
 wait_for_common kernel/sched/completion.c:115 [inline]
 wait_for_completion+0x26f/0x3c0 kernel/sched/completion.c:136
 kthread_stop+0x17a/0x780 kernel/kthread.c:559
 dvb_ca_en50221_release+0x91/0x1d0 drivers/media/dvb-core/dvb_ca_en50221.c:1934
 tt3650_ci_uninit drivers/media/usb/dvb-usb/pctv452e.c:364 [inline]
 pctv452e_usb_disconnect+0xb0/0xf0 drivers/media/usb/dvb-usb/pctv452e.c:1061
 usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423
 __device_release_driver drivers/base/dd.c:1134 [inline]
 device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165
 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:532
 device_del+0x481/0xd30 drivers/base/core.c:2664
 usb_disable_device+0x23d/0x790 drivers/usb/core/message.c:1237
 usb_disconnect+0x293/0x900 drivers/usb/core/hub.c:2201
 hub_port_connect drivers/usb/core/hub.c:5036 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5325 [inline]
 port_event drivers/usb/core/hub.c:5471 [inline]
 hub_event+0x1a1d/0x4300 drivers/usb/core/hub.c:5553
 process_one_work+0x945/0x15c0 kernel/workqueue.c:2264
 worker_thread+0x96/0xe20 kernel/workqueue.c:2410
 kthread+0x318/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Showing all locks held in the system:
1 lock held by khungtaskd/22:
 #0: ffffffff871055a0 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x264 kernel/locking/lockdep.c:5331
4 locks held by kworker/1:2/94:
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data kernel/workqueue.c:615 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: process_one_work+0x827/0x15c0 kernel/workqueue.c:2235
 #1: ffff8881d5d4fdd0 ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x85b/0x15c0 kernel/workqueue.c:2239
 #2: ffff8881d4d94200 (&dev->mutex){....}, at: device_lock include/linux/device.h:1493 [inline]
 #2: ffff8881d4d94200 (&dev->mutex){....}, at: hub_event+0x1be/0x4300 drivers/usb/core/hub.c:5499
 #3: ffff8881d4d96540 (&port_dev->status_lock){+.+.}, at: usb_lock_port drivers/usb/core/hub.c:2998 [inline]
 #3: ffff8881d4d96540 (&port_dev->status_lock){+.+.}, at: hub_event+0x599/0x4300 drivers/usb/core/hub.c:5552
1 lock held by rsyslogd/1674:
2 locks held by getty/1764:
 #0: ffff8881cf20c090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
 #1: ffffc9000044d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156
2 locks held by getty/1765:
 #0: ffff8881cf3c2090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
 #1: ffffc900004552e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156
2 locks held by getty/1766:
 #0: ffff8881cee44090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
 #1: ffffc900004712e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156
2 locks held by getty/1767:
 #0: ffff8881ced86090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
 #1: ffffc900004752e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156
2 locks held by getty/1768:
 #0: ffff8881cee43090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
 #1: ffffc9000046d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156
2 locks held by getty/1769:
 #0: ffff8881ced80090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
 #1: ffffc9000045d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156
2 locks held by getty/1770:
 #0: ffff8881cf20a090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
 #1: ffffc9000043d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156
5 locks held by kworker/0:5/4434:
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data kernel/workqueue.c:615 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: process_one_work+0x827/0x15c0 kernel/workqueue.c:2235
 #1: ffff8881ab337dd0 ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x85b/0x15c0 kernel/workqueue.c:2239
 #2: ffff8881d4e2a200 (&dev->mutex){....}, at: device_lock include/linux/device.h:1493 [inline]
 #2: ffff8881d4e2a200 (&dev->mutex){....}, at: hub_event+0x1be/0x4300 drivers/usb/core/hub.c:5499
 #3: ffff8881d06cf200 (&dev->mutex){....}, at: device_lock include/linux/device.h:1493 [inline]
 #3: ffff8881d06cf200 (&dev->mutex){....}, at: usb_disconnect+0x91/0x900 drivers/usb/core/hub.c:2192
 #4: ffff8881c9dce190 (&dev->mutex){....}, at: device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162
3 locks held by kworker/1:6/4650:
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data kernel/workqueue.c:615 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: process_one_work+0x827/0x15c0 kernel/workqueue.c:2235
 #1: ffff8881cdaf7dd0 ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x85b/0x15c0 kernel/workqueue.c:2239
 #2: ffff8881d4d16200 (&dev->mutex){....}, at: device_lock include/linux/device.h:1493 [inline]
 #2: ffff8881d4d16200 (&dev->mutex){....}, at: hub_event+0x1be/0x4300 drivers/usb/core/hub.c:5499
6 locks held by kworker/0:4/16981:
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data kernel/workqueue.c:615 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: process_one_work+0x827/0x15c0 kernel/workqueue.c:2235
 #1: ffff8881d2aa7dd0 ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x85b/0x15c0 kernel/workqueue.c:2239
 #2: ffff8881d4d6d200 (&dev->mutex){....}, at: device_lock include/linux/device.h:1493 [inline]
 #2: ffff8881d4d6d200 (&dev->mutex){....}, at: hub_event+0x1be/0x4300 drivers/usb/core/hub.c:5499
 #3: ffff8881ad781200 (&dev->mutex){....}, at: device_lock include/linux/device.h:1493 [inline]
 #3: ffff8881ad781200 (&dev->mutex){....}, at: __device_attach+0x7b/0x390 drivers/base/dd.c:871
 #4: ffff8881b7a8d190 (&dev->mutex){....}, at: device_lock include/linux/device.h:1493 [inline]
 #4: ffff8881b7a8d190 (&dev->mutex){....}, at: __device_attach+0x7b/0x390 drivers/base/dd.c:871
 #5: ffffffff87652408 (minor_rwsem#2){++++}, at: usb_register_dev drivers/usb/core/file.c:187 [inline]
 #5: ffffffff87652408 (minor_rwsem#2){++++}, at: usb_register_dev+0x19d/0x740 drivers/usb/core/file.c:156
6 locks held by kworker/1:5/27215:
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data kernel/workqueue.c:615 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline]
 #0: ffff8881d8924528 ((wq_completion)usb_hub_wq){+.+.}, at: process_one_work+0x827/0x15c0 kernel/workqueue.c:2235
 #1: ffff8881abaafdd0 ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x85b/0x15c0 kernel/workqueue.c:2239
 #2: ffff8881d4dfb200 (&dev->mutex){....}, at: device_lock include/linux/device.h:1493 [inline]
 #2: ffff8881d4dfb200 (&dev->mutex){....}, at: hub_event+0x1be/0x4300 drivers/usb/core/hub.c:5499
 #3: ffff8881c7c24200 (&dev->mutex){....}, at: device_lock include/linux/device.h:1493 [inline]
 #3: ffff8881c7c24200 (&dev->mutex){....}, at: usb_disconnect+0x91/0x900 drivers/usb/core/hub.c:2192
 #4: ffff8881d5f6e190 (&dev->mutex){....}, at: device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162
 #5: ffffffff87791940 (input_mutex){+.+.}, at: __input_unregister_device+0x118/0x430 drivers/input/input.c:2089
4 locks held by kdvb-ca-0:0/28111:
3 locks held by syz-executor.2/29719:
 #0: ffffffff87652408 (minor_rwsem#2){++++}, at: usb_open+0x23/0x270 drivers/usb/core/file.c:39
 #1: ffffffff876c4500 (wdm_mutex){+.+.}, at: wdm_open+0x59/0x4e0 drivers/usb/class/cdc-wdm.c:643
 #2: ffff8881d4d96540 (&port_dev->status_lock){+.+.}, at: usb_lock_port drivers/usb/core/hub.c:2998 [inline]
 #2: ffff8881d4d96540 (&port_dev->status_lock){+.+.}, at: usb_port_resume+0x28f/0x1650 drivers/usb/core/hub.c:3526
1 lock held by syz-executor.1/29700:
 #0: ffffffff87652408 (minor_rwsem#2){++++}, at: usb_open+0x23/0x270 drivers/usb/core/file.c:39

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

NMI backtrace for cpu 0
CPU: 0 PID: 22 Comm: khungtaskd Not tainted 5.5.0-rc7-syzkaller #0
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+0xef/0x16e lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1db/0x207 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline]
 watchdog+0xa99/0xfd0 kernel/hung_task.c:289
 kthread+0x318/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 28111 Comm: kdvb-ca-0:0 Not tainted 5.5.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:2861 [inline]
RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:2880 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:2935 [inline]
RIP: 0010:__lock_acquire+0x14e7/0x3b60 kernel/locking/lockdep.c:3954
Code: fc ff df 4c 8b 6c 24 30 eb 06 48 83 eb 08 74 42 48 8d 7b 18 48 89 f8 48 c1 e8 03 42 80 3c 20 00 0f 85 3b 1a 00 00 48 8b 43 18 <49> 39 c5 0f 84 98 f3 ff ff 48 8d 7b 08 48 89 f8 48 c1 e8 03 42 80
RSP: 0018:ffff8881db309ab0 EFLAGS: 00000046
RAX: 99493c7b9b943235 RBX: ffffffff88ce09c0 RCX: 0000000000001649
RDX: 1ffffffff1261ad9 RSI: 0000000000000008 RDI: ffffffff88ce09d8
RBP: ffff8881cc0c1880 R08: ffffffff8930d6c8 R09: fffffbfff1269ca7
R10: fffffbfff1269ca6 R11: ffffffff8934e537 R12: dffffc0000000000
R13: 99493c7b9b943235 R14: ffffffff87e1e4f0 R15: ffff8881cc0c2148
FS:  0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 00000001af618000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x130/0x340 kernel/locking/lockdep.c:4484
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x32/0x50 kernel/locking/spinlock.c:159
 try_to_wake_up+0x99/0x1690 kernel/sched/core.c:2552
 call_timer_fn+0x195/0x6f0 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0x5f9/0x1500 kernel/time/timer.c:1786
 __do_softirq+0x21e/0x950 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x178/0x1a0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x141/0x540 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:85 [inline]
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1751 [inline]
RIP: 0010:vprintk_emit+0x3c8/0x3d0 kernel/printk/printk.c:1995
Code: 00 83 fb ff 75 d6 e9 e0 fc ff ff e8 82 d6 15 00 e8 ad 1a 1b 00 41 56 9d e9 b6 fd ff ff e8 70 d6 15 00 e8 9b 1a 1b 00 41 56 9d <e9> 2a ff ff ff 0f 1f 00 55 48 89 f5 53 48 89 fb e8 53 d6 15 00 49
RSP: 0018:ffff8881ad127b60 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: 0000000000000200 RCX: 0000000000000006
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8881cc0c20cc
RBP: ffff8881ad127ba8 R08: ffff8881cc0c1880 R09: fffffbfff1269cc7
R10: fffffbfff1269cc6 R11: ffffffff8934e637 R12: 000000000000002d
R13: ffff8881da24e200 R14: 0000000000000293 R15: 0000000000000000
 vprintk_func+0x75/0x113 kernel/printk/printk_safe.c:386
 printk+0xba/0xed kernel/printk/printk.c:2056
 tt3650_ci_msg.cold+0x30/0x3e drivers/media/usb/dvb-usb/pctv452e.c:141
 tt3650_ci_msg_locked+0x83/0xb0 drivers/media/usb/dvb-usb/pctv452e.c:157
 tt3650_ci_poll_slot_status+0x90/0x110 drivers/media/usb/dvb-usb/pctv452e.c:333
 dvb_ca_en50221_check_camstatus+0x102/0x330 drivers/media/dvb-core/dvb_ca_en50221.c:234
 dvb_ca_en50221_thread_state_machine drivers/media/dvb-core/dvb_ca_en50221.c:1128 [inline]
 dvb_ca_en50221_thread+0x26b/0x13e0 drivers/media/dvb-core/dvb_ca_en50221.c:1317
 kthread+0x318/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352