Bluetooth: hci0 command 0x0406 tx timeout Bluetooth: hci3 command 0x0406 tx timeout Bluetooth: hci5 command 0x0406 tx timeout Bluetooth: hci2 command 0x0406 tx timeout Bluetooth: hci4 command 0x0406 tx timeout INFO: task kworker/0:2:3624 blocked for more than 140 seconds. Not tainted 4.14.256-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:2 D26296 3624 2 0x80000000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 usb_kill_urb.part.0+0x125/0x190 drivers/usb/core/urb.c:691 usb_kill_urb+0x7c/0x90 drivers/usb/core/urb.c:686 usb_start_wait_urb+0x209/0x440 drivers/usb/core/message.c:62 usb_internal_control_msg drivers/usb/core/message.c:100 [inline] usb_control_msg+0x302/0x450 drivers/usb/core/message.c:151 hub_port_init+0xfdc/0x2970 drivers/usb/core/hub.c:4601 hub_port_connect drivers/usb/core/hub.c:4951 [inline] hub_port_connect_change drivers/usb/core/hub.c:5134 [inline] port_event drivers/usb/core/hub.c:5240 [inline] hub_event+0x18fd/0x3e40 drivers/usb/core/hub.c:5320 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 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: 1 lock held by khungtaskd/1533: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 5 locks held by kworker/0:2/3624: #0: ("usb_hub_wq"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088 #1: ((&hub->events)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092 #2: (&dev->mutex){....}, at: [] device_lock include/linux/device.h:1082 [inline] #2: (&dev->mutex){....}, at: [] hub_event+0x108/0x3e40 drivers/usb/core/hub.c:5266 #3: (&port_dev->status_lock){+.+.}, at: [] usb_lock_port drivers/usb/core/hub.c:2936 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect drivers/usb/core/hub.c:4950 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect_change drivers/usb/core/hub.c:5134 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] port_event drivers/usb/core/hub.c:5240 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_event+0x18e8/0x3e40 drivers/usb/core/hub.c:5320 #4: (hcd->address0_mutex){+.+.}, at: [] hub_port_init+0x15b/0x2970 drivers/usb/core/hub.c:4475 2 locks held by systemd-journal/4615: #0: (&rq->lock){-.-.}, at: [] idle_balance kernel/sched/fair.c:8471 [inline] #0: (&rq->lock){-.-.}, at: [] pick_next_task_fair+0x554/0x1450 kernel/sched/fair.c:6379 #1: (&rq->lock){-.-.}, at: [] rq_lock_irqsave kernel/sched/sched.h:1725 [inline] #1: (&rq->lock){-.-.}, at: [] load_balance+0x70b/0x2120 kernel/sched/fair.c:8150 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.256-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: 8 Comm: rcu_preempt Not tainted 4.14.256-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880b5420200 task.stack: ffff8880b5428000 RIP: 0010:lookup_object lib/debugobjects.c:132 [inline] RIP: 0010:debug_object_assert_init lib/debugobjects.c:640 [inline] RIP: 0010:debug_object_assert_init+0x122/0x2d0 lib/debugobjects.c:627 RSP: 0018:ffff8880b542fb40 EFLAGS: 00000046 RAX: 1ffff110137a51ed RBX: ffff88809bd28f50 RCX: 000000000000141d RDX: 1ffffffff17fc46b RSI: 0000000000000286 RDI: ffff88809bd28f68 RBP: 0000000000000001 R08: ffffffff8bfe2348 R09: 00000000000c0001 R10: ffff8880b5420a88 R11: ffff8880b5420200 R12: dffffc0000000000 R13: ffff8880b542fbd8 R14: ffff8880b542fd18 R15: 1ffff11016a85f6b FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f73a04dd008 CR3: 00000000a1ca9000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: debug_timer_assert_init kernel/time/timer.c:708 [inline] debug_assert_init kernel/time/timer.c:756 [inline] try_to_del_timer_sync+0x5d/0xe0 kernel/time/timer.c:1176 del_timer_sync+0x17c/0x240 kernel/time/timer.c:1246 schedule_timeout+0x4b7/0xe90 kernel/time/timer.c:1748 rcu_gp_kthread+0xc0a/0x1e60 kernel/rcu/tree.c:2255 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: 48 8b 9b c0 fe fa 8b 31 ed 48 85 db 74 47 49 bc 00 00 00 00 00 fc ff df 48 8d 7b 18 83 c5 01 48 89 f8 48 c1 e8 03 42 80 3c 20 00 <0f> 85 2b 01 00 00 4c 3b 73 18 0f 84 f3 00 00 00 48 89 d8 48 c1 ---------------- Code disassembly (best guess): 0: 48 8b 9b c0 fe fa 8b mov -0x74050140(%rbx),%rbx 7: 31 ed xor %ebp,%ebp 9: 48 85 db test %rbx,%rbx c: 74 47 je 0x55 e: 49 bc 00 00 00 00 00 movabs $0xdffffc0000000000,%r12 15: fc ff df 18: 48 8d 7b 18 lea 0x18(%rbx),%rdi 1c: 83 c5 01 add $0x1,%ebp 1f: 48 89 f8 mov %rdi,%rax 22: 48 c1 e8 03 shr $0x3,%rax 26: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) * 2b: 0f 85 2b 01 00 00 jne 0x15c <-- trapping instruction 31: 4c 3b 73 18 cmp 0x18(%rbx),%r14 35: 0f 84 f3 00 00 00 je 0x12e 3b: 48 89 d8 mov %rbx,%rax 3e: 48 rex.W 3f: c1 .byte 0xc1