vhci_hcd: connection closed vhci_hcd: stop threads vhci_hcd: release socket vhci_hcd: disconnect device vhci_hcd vhci_hcd.0: port 1 already used INFO: task kworker/0:1:24 blocked for more than 140 seconds. vhci_hcd vhci_hcd.0: pdev(1) rhport(0) sockfd(3) Not tainted 4.14.218-syzkaller #0 vhci_hcd vhci_hcd.0: devid(0) speed(3) speed_str(high-speed) vhci_hcd vhci_hcd.0: port 1 already used "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. vhci_hcd: connection closed kworker/0:1 D vhci_hcd: stop threads 28520 24 2 0x80000000 vhci_hcd vhci_hcd.0: pdev(0) rhport(0) sockfd(3) Workqueue: usb_hub_wq hub_event vhci_hcd vhci_hcd.0: devid(0) speed(3) speed_str(high-speed) vhci_hcd: release socket vhci_hcd: disconnect device Call Trace: vhci_hcd: connection closed context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 vhci_hcd: stop threads vhci_hcd: release socket vhci_hcd: disconnect device schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 vhci_hcd vhci_hcd.0: port 1 already used usb_kill_urb.part.0+0x125/0x190 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/urb.c:691 vhci_hcd vhci_hcd.0: pdev(3) rhport(0) sockfd(3) vhci_hcd vhci_hcd.0: devid(0) speed(3) speed_str(high-speed) vhci_hcd: connection closed usb_kill_urb+0x7c/0x90 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/urb.c:686 vhci_hcd: stop threads usb_start_wait_urb+0x209/0x440 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/message.c:62 vhci_hcd: release socket vhci_hcd: disconnect device usb_internal_control_msg syzkaller/managers/linux-4-14/kernel/drivers/usb/core/message.c:100 [inline] usb_control_msg+0x302/0x450 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/message.c:151 hub_port_init+0xfdc/0x2970 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4555 hub_port_connect syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4905 [inline] hub_port_connect_change syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5088 [inline] port_event syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5194 [inline] hub_event+0x18fd/0x3d70 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5274 process_one_work+0x793/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2250 kthread+0x30d/0x420 syzkaller/managers/linux-4-14/kernel/kernel/kthread.c:232 ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/entry_64.S:404 INFO: task kworker/1:2:3469 blocked for more than 140 seconds. Not tainted 4.14.218-syzkaller #0 vhci_hcd vhci_hcd.0: port 1 already used "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/1:2 D26232 3469 2 0x80000000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 vhci_hcd vhci_hcd.0: pdev(2) rhport(0) sockfd(3) vhci_hcd vhci_hcd.0: devid(0) speed(3) speed_str(high-speed) vhci_hcd: connection closed vhci_hcd: stop threads schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 vhci_hcd: release socket vhci_hcd: disconnect device usb_kill_urb.part.0+0x125/0x190 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/urb.c:691 usb_kill_urb+0x7c/0x90 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/urb.c:686 usb_start_wait_urb+0x209/0x440 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/message.c:62 vhci_hcd vhci_hcd.0: port 1 already used usb_internal_control_msg syzkaller/managers/linux-4-14/kernel/drivers/usb/core/message.c:100 [inline] usb_control_msg+0x302/0x450 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/message.c:151 hub_port_init+0xfdc/0x2970 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4555 hub_port_connect syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4905 [inline] hub_port_connect_change syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5088 [inline] port_event syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5194 [inline] hub_event+0x18fd/0x3d70 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5274 vhci_hcd vhci_hcd.0: pdev(5) rhport(0) sockfd(3) vhci_hcd vhci_hcd.0: devid(0) speed(3) speed_str(high-speed) vhci_hcd: connection closed vhci_hcd: stop threads vhci_hcd: release socket vhci_hcd: disconnect device vhci_hcd vhci_hcd.0: port 1 already used process_one_work+0x793/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2250 kthread+0x30d/0x420 syzkaller/managers/linux-4-14/kernel/kernel/kthread.c:232 ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/entry_64.S:404 vhci_hcd vhci_hcd.0: pdev(4) rhport(0) sockfd(3) INFO: task kworker/0:2:4312 blocked for more than 140 seconds. vhci_hcd vhci_hcd.0: devid(0) speed(3) speed_str(high-speed) vhci_hcd: connection closed Not tainted 4.14.218-syzkaller #0 vhci_hcd: stop threads "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. vhci_hcd vhci_hcd.0: port 1 already used kworker/0:2 D vhci_hcd: release socket 27208 4312 2 0x80000000 vhci_hcd: disconnect device Workqueue: usb_hub_wq hub_event vhci_hcd vhci_hcd.0: pdev(1) rhport(0) sockfd(3) vhci_hcd vhci_hcd.0: devid(0) speed(3) speed_str(high-speed) vhci_hcd vhci_hcd.0: port 1 already used Call Trace: vhci_hcd: connection closed context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 vhci_hcd: stop threads vhci_hcd vhci_hcd.0: pdev(0) rhport(0) sockfd(3) vhci_hcd: release socket vhci_hcd vhci_hcd.0: devid(0) speed(3) speed_str(high-speed) vhci_hcd: disconnect device vhci_hcd: connection closed vhci_hcd: stop threads vhci_hcd vhci_hcd.0: port 1 already used vhci_hcd: release socket schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 vhci_hcd: disconnect device usb_kill_urb.part.0+0x125/0x190 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/urb.c:691 vhci_hcd vhci_hcd.0: pdev(3) rhport(0) sockfd(3) vhci_hcd vhci_hcd.0: devid(0) speed(3) speed_str(high-speed) usb_kill_urb+0x7c/0x90 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/urb.c:686 usb_start_wait_urb+0x209/0x440 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/message.c:62 vhci_hcd: connection closed vhci_hcd: stop threads vhci_hcd: release socket usb_internal_control_msg syzkaller/managers/linux-4-14/kernel/drivers/usb/core/message.c:100 [inline] usb_control_msg+0x302/0x450 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/message.c:151 hub_port_init+0xfdc/0x2970 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4555 hub_port_connect syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4905 [inline] hub_port_connect_change syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5088 [inline] port_event syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5194 [inline] hub_event+0x18fd/0x3d70 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5274 vhci_hcd: disconnect device process_one_work+0x793/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2116 process_scheduled_works syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2176 [inline] worker_thread+0x7d3/0xff0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2252 kthread+0x30d/0x420 syzkaller/managers/linux-4-14/kernel/kernel/kthread.c:232 ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/entry_64.S:404 INFO: task kworker/0:4:8013 blocked for more than 140 seconds. Not tainted 4.14.218-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:4 D26720 8013 2 0x80000000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 vhci_hcd vhci_hcd.0: port 1 already used schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 usb_kill_urb.part.0+0x125/0x190 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/urb.c:691 usb_kill_urb+0x7c/0x90 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/urb.c:686 usb_start_wait_urb+0x209/0x440 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/message.c:62 vhci_hcd vhci_hcd.0: pdev(2) rhport(0) sockfd(3) vhci_hcd vhci_hcd.0: devid(0) speed(3) speed_str(high-speed) usb_internal_control_msg syzkaller/managers/linux-4-14/kernel/drivers/usb/core/message.c:100 [inline] usb_control_msg+0x302/0x450 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/message.c:151 vhci_hcd vhci_hcd.0: port 1 already used vhci_hcd: connection closed vhci_hcd: stop threads vhci_hcd: release socket hub_port_init+0xfdc/0x2970 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4555 hub_port_connect syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4905 [inline] hub_port_connect_change syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5088 [inline] port_event syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5194 [inline] hub_event+0x18fd/0x3d70 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5274 vhci_hcd: disconnect device vhci_hcd vhci_hcd.0: pdev(5) rhport(0) sockfd(3) vhci_hcd vhci_hcd.0: devid(0) speed(3) speed_str(high-speed) vhci_hcd vhci_hcd.0: port 1 already used process_one_work+0x793/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2116 vhci_hcd: connection closed vhci_hcd: stop threads vhci_hcd: release socket vhci_hcd: disconnect device vhci_hcd vhci_hcd.0: pdev(4) rhport(0) sockfd(3) vhci_hcd vhci_hcd.0: devid(0) speed(3) speed_str(high-speed) vhci_hcd: connection closed vhci_hcd: stop threads worker_thread+0x5cc/0xff0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2250 vhci_hcd: release socket vhci_hcd: disconnect device kthread+0x30d/0x420 syzkaller/managers/linux-4-14/kernel/kernel/kthread.c:232 ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/entry_64.S:404 INFO: task kworker/1:3:8458 blocked for more than 140 seconds. Not tainted 4.14.218-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. vhci_hcd vhci_hcd.0: port 1 already used kworker/1:3 D27232 8458 2 0x80000000 Workqueue: usb_hub_wq hub_event Call Trace: vhci_hcd vhci_hcd.0: pdev(1) rhport(0) sockfd(3) vhci_hcd vhci_hcd.0: port 1 already used vhci_hcd vhci_hcd.0: devid(0) speed(3) speed_str(high-speed) vhci_hcd: connection closed context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 vhci_hcd: stop threads vhci_hcd: release socket schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 usb_kill_urb.part.0+0x125/0x190 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/urb.c:691 vhci_hcd: disconnect device vhci_hcd vhci_hcd.0: pdev(0) rhport(0) sockfd(3) vhci_hcd vhci_hcd.0: devid(0) speed(3) speed_str(high-speed) vhci_hcd: connection closed vhci_hcd: stop threads vhci_hcd vhci_hcd.0: port 1 already used usb_kill_urb+0x7c/0x90 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/urb.c:686 vhci_hcd: release socket usb_start_wait_urb+0x209/0x440 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/message.c:62 vhci_hcd: disconnect device vhci_hcd vhci_hcd.0: pdev(3) rhport(0) sockfd(3) vhci_hcd vhci_hcd.0: devid(0) speed(3) speed_str(high-speed) vhci_hcd: connection closed vhci_hcd: stop threads vhci_hcd: release socket usb_internal_control_msg syzkaller/managers/linux-4-14/kernel/drivers/usb/core/message.c:100 [inline] usb_control_msg+0x302/0x450 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/message.c:151 vhci_hcd: disconnect device hub_port_init+0xfdc/0x2970 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4555 hub_port_connect syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4905 [inline] hub_port_connect_change syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5088 [inline] port_event syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5194 [inline] hub_event+0x18fd/0x3d70 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5274 process_one_work+0x793/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2250 kthread+0x30d/0x420 syzkaller/managers/linux-4-14/kernel/kernel/kthread.c:232 ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/entry_64.S:404 INFO: task kworker/0:6:9514 blocked for more than 140 seconds. Not tainted 4.14.218-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:6 D28456 9514 2 0x80000000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 usb_kill_urb.part.0+0x125/0x190 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/urb.c:691 usb_kill_urb+0x7c/0x90 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/urb.c:686 usb_start_wait_urb+0x209/0x440 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/message.c:62 vhci_hcd vhci_hcd.0: port 1 already used usb_internal_control_msg syzkaller/managers/linux-4-14/kernel/drivers/usb/core/message.c:100 [inline] usb_control_msg+0x302/0x450 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/message.c:151 vhci_hcd vhci_hcd.0: pdev(2) rhport(0) sockfd(3) vhci_hcd vhci_hcd.0: devid(0) speed(3) speed_str(high-speed) hub_port_init+0xfdc/0x2970 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4555 vhci_hcd: connection closed vhci_hcd: stop threads hub_port_connect syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4905 [inline] hub_port_connect_change syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5088 [inline] port_event syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5194 [inline] hub_event+0x18fd/0x3d70 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5274 vhci_hcd: release socket vhci_hcd vhci_hcd.0: port 1 already used vhci_hcd: disconnect device process_one_work+0x793/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2116 vhci_hcd vhci_hcd.0: port 1 already used vhci_hcd vhci_hcd.0: pdev(4) rhport(0) sockfd(3) vhci_hcd vhci_hcd.0: pdev(5) rhport(0) sockfd(3) vhci_hcd vhci_hcd.0: devid(0) speed(3) speed_str(high-speed) vhci_hcd vhci_hcd.0: devid(0) speed(3) speed_str(high-speed) worker_thread+0x5cc/0xff0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2250 vhci_hcd: connection closed vhci_hcd: stop threads vhci_hcd: release socket kthread+0x30d/0x420 syzkaller/managers/linux-4-14/kernel/kernel/kthread.c:232 vhci_hcd: disconnect device ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/entry_64.S:404 Showing all locks held in the system: vhci_hcd: connection closed vhci_hcd vhci_hcd.0: port 1 already used vhci_hcd: stop threads 5 locks held by kworker/0:1/24: #0: ("usb_hub_wq"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2087 #1: ((&hub->events)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2091 #2: (&dev->mutex){....}, at: [] device_lock syzkaller/managers/linux-4-14/kernel/./include/linux/device.h:1081 [inline] #2: (&dev->mutex){....}, at: [] hub_event+0x108/0x3d70 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5220 #3: (&port_dev->status_lock){+.+.}, at: [] usb_lock_port syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:2934 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4904 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect_change syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5088 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] port_event syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5194 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_event+0x18e8/0x3d70 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5274 #4: (hcd->address0_mutex){+.+.}, at: [] hub_port_init+0x15b/0x2970 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4429 1 lock held by khungtaskd/1528: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a syzkaller/managers/linux-4-14/kernel/kernel/locking/lockdep.c:4548 5 locks held by kworker/1:2/3469: #0: ("usb_hub_wq"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2087 #1: ((&hub->events)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2091 #2: (&dev->mutex){....}, at: [] device_lock syzkaller/managers/linux-4-14/kernel/./include/linux/device.h:1081 [inline] #2: (&dev->mutex){....}, at: [] hub_event+0x108/0x3d70 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5220 #3: (&port_dev->status_lock){+.+.}, at: [] usb_lock_port syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:2934 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4904 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect_change syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5088 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] port_event syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5194 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_event+0x18e8/0x3d70 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5274 #4: (hcd->address0_mutex){+.+.}, at: [] hub_port_init+0x15b/0x2970 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4429 5 locks held by kworker/0:2/4312: #0: ("usb_hub_wq"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2087 #1: ((&hub->events)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2091 #2: (&dev->mutex){....}, at: [] device_lock syzkaller/managers/linux-4-14/kernel/./include/linux/device.h:1081 [inline] #2: (&dev->mutex){....}, at: [] hub_event+0x108/0x3d70 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5220 #3: (&port_dev->status_lock){+.+.}, at: [] usb_lock_port syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:2934 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4904 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect_change syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5088 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] port_event syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5194 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_event+0x18e8/0x3d70 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5274 #4: (hcd->address0_mutex){+.+.}, at: [] hub_port_init+0x15b/0x2970 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4429 1 lock held by syz-executor.1/8009: #0: (tasklist_lock){.+.+}, at: [] release_task+0x14d/0x1380 syzkaller/managers/linux-4-14/kernel/kernel/exit.c:198 5 locks held by kworker/0:4/8013: #0: ("usb_hub_wq"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2087 #1: ((&hub->events)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2091 #2: (&dev->mutex){....}, at: [] device_lock syzkaller/managers/linux-4-14/kernel/./include/linux/device.h:1081 [inline] #2: (&dev->mutex){....}, at: [] hub_event+0x108/0x3d70 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5220 #3: (&port_dev->status_lock){+.+.}, at: [] usb_lock_port syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:2934 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4904 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect_change syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5088 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] port_event syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5194 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_event+0x18e8/0x3d70 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5274 #4: (hcd->address0_mutex){+.+.}, at: [] hub_port_init+0x15b/0x2970 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4429 5 locks held by kworker/1:3/8458: #0: ("usb_hub_wq"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2087 #1: ((&hub->events)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2091 #2: (&dev->mutex){....}, at: [] device_lock syzkaller/managers/linux-4-14/kernel/./include/linux/device.h:1081 [inline] #2: (&dev->mutex){....}, at: [] hub_event+0x108/0x3d70 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5220 #3: (&port_dev->status_lock){+.+.}, at: [] usb_lock_port syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:2934 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4904 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect_change syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5088 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] port_event syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5194 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_event+0x18e8/0x3d70 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5274 #4: (hcd->address0_mutex){+.+.}, at: [] hub_port_init+0x15b/0x2970 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4429 5 locks held by kworker/0:6/9514: #0: ("usb_hub_wq"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2087 #1: ((&hub->events)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2091 #2: (&dev->mutex){....}, at: [] device_lock syzkaller/managers/linux-4-14/kernel/./include/linux/device.h:1081 [inline] #2: (&dev->mutex){....}, at: [] hub_event+0x108/0x3d70 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5220 #3: (&port_dev->status_lock){+.+.}, at: [] usb_lock_port syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:2934 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4904 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect_change syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5088 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] port_event syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5194 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_event+0x18e8/0x3d70 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5274 #4: (hcd->address0_mutex){+.+.}, at: [] hub_port_init+0x15b/0x2970 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4429 ============================================= vhci_hcd vhci_hcd.0: port 1 already used vhci_hcd vhci_hcd.0: port 1 already used vhci_hcd: release socket vhci_hcd vhci_hcd.0: pdev(0) rhport(0) sockfd(3) vhci_hcd vhci_hcd.0: devid(0) speed(3) speed_str(high-speed) NMI backtrace for cpu 1 vhci_hcd: disconnect device CPU: 1 PID: 1528 Comm: khungtaskd Not tainted 4.14.218-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: vhci_hcd vhci_hcd.0: pdev(3) rhport(0) sockfd(3) __dump_stack syzkaller/managers/linux-4-14/kernel/lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 syzkaller/managers/linux-4-14/kernel/lib/dump_stack.c:58 vhci_hcd vhci_hcd.0: devid(0) speed(3) speed_str(high-speed) nmi_cpu_backtrace.cold+0x57/0x93 syzkaller/managers/linux-4-14/kernel/lib/nmi_backtrace.c:101 vhci_hcd: connection closed nmi_trigger_cpumask_backtrace+0x13a/0x180 syzkaller/managers/linux-4-14/kernel/lib/nmi_backtrace.c:62 vhci_hcd: connection closed trigger_all_cpu_backtrace syzkaller/managers/linux-4-14/kernel/./include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks syzkaller/managers/linux-4-14/kernel/kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 syzkaller/managers/linux-4-14/kernel/kernel/hung_task.c:274 kthread+0x30d/0x420 syzkaller/managers/linux-4-14/kernel/kernel/kthread.c:232 vhci_hcd: stop threads ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/entry_64.S:404 Sending NMI from CPU 1 to CPUs 0: vhci_hcd: release socket NMI backtrace for cpu 0 CPU: 0 PID: 34 Comm: kworker/u4:2 Not tainted 4.14.218-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usbip_event event_handler task: ffff8880b56b61c0 task.stack: ffff8880b56b8000 RIP: 0010:io_serial_in+0x60/0x80 syzkaller/managers/linux-4-14/kernel/drivers/tty/serial/8250/8250_port.c:451 RSP: 0018:ffff8880b56bf950 EFLAGS: 00000002 RAX: dffffc0000000060 RBX: 00000000000003fd RCX: 0000000000000000 RDX: 00000000000003fd RSI: 0000000000000005 RDI: ffffffff8c8bb3b8 RBP: ffffffff8c8bb380 R08: ffffffff8b999e38 R09: 00000000000c0043 R10: ffff8880b56b6ae8 R11: ffff8880b56b61c0 R12: 0000000000000020 R13: fffffbfff19176b7 R14: fffffbfff1917679 R15: ffffffff8c8bb5ba FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000568000 CR3: 00000000b2ffd000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: serial_in syzkaller/managers/linux-4-14/kernel/drivers/tty/serial/8250/8250.h:115 [inline] wait_for_xmitr+0x8a/0x1e0 syzkaller/managers/linux-4-14/kernel/drivers/tty/serial/8250/8250_port.c:2046 serial8250_console_putchar+0x1b/0x50 syzkaller/managers/linux-4-14/kernel/drivers/tty/serial/8250/8250_port.c:3205 uart_console_write+0x44/0xd0 syzkaller/managers/linux-4-14/kernel/drivers/tty/serial/serial_core.c:1903 serial8250_console_write+0x582/0x9d0 syzkaller/managers/linux-4-14/kernel/drivers/tty/serial/8250/8250_port.c:3271 call_console_drivers syzkaller/managers/linux-4-14/kernel/kernel/printk/printk.c:1725 [inline] console_unlock+0x99d/0xf20 syzkaller/managers/linux-4-14/kernel/kernel/printk/printk.c:2400 vprintk_emit+0x224/0x620 syzkaller/managers/linux-4-14/kernel/kernel/printk/printk.c:1923 vprintk_func+0x58/0x160 syzkaller/managers/linux-4-14/kernel/kernel/printk/printk_safe.c:401 printk+0x9e/0xbc syzkaller/managers/linux-4-14/kernel/kernel/printk/printk.c:1996 vhci_shutdown_connection.cold+0xfb/0x840 syzkaller/managers/linux-4-14/kernel/drivers/usb/usbip/vhci_hcd.c:1048 event_handler+0x1c3/0x4a0 syzkaller/managers/linux-4-14/kernel/drivers/usb/usbip/usbip_event.c:92 process_one_work+0x793/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2250 kthread+0x30d/0x420 syzkaller/managers/linux-4-14/kernel/kernel/kthread.c:232 ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/entry_64.S:404 Code: 30 0f b6 8d d1 00 00 00 48 8d 7d 38 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 d3 e3 80 3c 02 00 75 13 03 5d 38 89 da ec <5b> 0f b6 c0 5d c3 e8 c5 53 25 fe eb c9 e8 8e 55 25 fe eb e6 66