INFO: task kworker/1:5:4473 blocked for more than 430 seconds. Not tainted 5.12.0-rc2-syzkaller-00487-gf296bfd5cd04 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:5 state:D stack: 0 pid: 4473 ppid: 2 flags:0x00000008 Workqueue: usb_hub_wq hub_event Call trace: __switch_to+0x1f8/0x32c arch/arm64/kernel/process.c:564 context_switch kernel/sched/core.c:4324 [inline] __schedule+0x810/0x1ac0 kernel/sched/core.c:5075 schedule+0xac/0x230 kernel/sched/core.c:5154 usb_kill_urb.part.0+0x1b4/0x220 drivers/usb/core/urb.c:711 usb_kill_urb+0x78/0xa0 drivers/usb/core/urb.c:706 usb_start_wait_urb+0x1d4/0x390 drivers/usb/core/message.c:64 usb_internal_control_msg drivers/usb/core/message.c:102 [inline] usb_control_msg+0x2ac/0x3d0 drivers/usb/core/message.c:153 hub_port_init+0x680/0x2350 drivers/usb/core/hub.c:4708 hub_port_connect drivers/usb/core/hub.c:5155 [inline] hub_port_connect_change drivers/usb/core/hub.c:5363 [inline] port_event drivers/usb/core/hub.c:5509 [inline] hub_event+0x15a0/0x358c drivers/usb/core/hub.c:5591 process_one_work+0x798/0x1764 kernel/workqueue.c:2275 worker_thread+0x3d4/0xcd0 kernel/workqueue.c:2421 kthread+0x320/0x3bc kernel/kthread.c:292 ret_from_fork+0x10/0x3c arch/arm64/kernel/entry.S:958 Showing all locks held in the system: 1 lock held by khungtaskd/1296: #0: ffff800017f7e0a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x74/0x25c kernel/locking/lockdep.c:6329 2 locks held by getty/3917: #0: ffff0000144f8098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340 #1: ffff80001ac1d2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x85c/0xc5c drivers/tty/n_tty.c:2178 5 locks held by kworker/1:5/4473: #0: ffff00000e10cd38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x6a4/0x1764 kernel/workqueue.c:2250 #1: ffff000014e67cd0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x6a4/0x1764 kernel/workqueue.c:2250 #2: ffff00000f81e218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline] #2: ffff00000f81e218 (&dev->mutex){....}-{3:3}, at: hub_event+0x110/0x358c drivers/usb/core/hub.c:5537 #3: ffff00000eb0b588 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3030 [inline] #3: ffff00000eb0b588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5154 [inline] #3: ffff00000eb0b588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5363 [inline] #3: ffff00000eb0b588 (&port_dev->status_lock){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5509 [inline] #3: ffff00000eb0b588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_event+0x158c/0x358c drivers/usb/core/hub.c:5591 #4: ffff00000eb79e68 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_init+0x174/0x2350 drivers/usb/core/hub.c:4582 2 locks held by kworker/u4:2/6148: =============================================