INFO: task kworker/1:5:4332 blocked for more than 143 seconds. Not tainted 6.1.30-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:5 state:D stack:0 pid:4332 ppid:2 flags:0x00000008 Workqueue: usb_hub_wq hub_event Call trace: __switch_to+0x320/0x754 arch/arm64/kernel/process.c:553 context_switch kernel/sched/core.c:5241 [inline] __schedule+0xee4/0x1c98 kernel/sched/core.c:6554 schedule+0xc4/0x170 kernel/sched/core.c:6630 rwsem_down_write_slowpath+0xc80/0x156c kernel/locking/rwsem.c:1189 __down_write_common kernel/locking/rwsem.c:1314 [inline] __down_write kernel/locking/rwsem.c:1323 [inline] down_write+0x84/0x88 kernel/locking/rwsem.c:1574 usb_deregister_dev+0xb8/0x304 drivers/usb/core/file.c:239 sisusb_disconnect+0x58/0x20c drivers/usb/misc/sisusbvga/sisusb.c:3166 usb_unbind_interface+0x1a4/0x758 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:550 [inline] __device_release_driver drivers/base/dd.c:1258 [inline] device_release_driver_internal+0x474/0x724 drivers/base/dd.c:1284 device_release_driver+0x28/0x38 drivers/base/dd.c:1307 bus_remove_device+0x298/0x38c drivers/base/bus.c:529 device_del+0x57c/0x9b4 drivers/base/core.c:3852 usb_disable_device+0x354/0x760 drivers/usb/core/message.c:1419 usb_disconnect+0x290/0x7b0 drivers/usb/core/hub.c:2238 hub_port_connect drivers/usb/core/hub.c:5199 [inline] hub_port_connect_change drivers/usb/core/hub.c:5499 [inline] port_event drivers/usb/core/hub.c:5655 [inline] hub_event+0x17a0/0x44a0 drivers/usb/core/hub.c:5737 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2289 process_scheduled_works kernel/workqueue.c:2352 [inline] worker_thread+0xb6c/0xfec kernel/workqueue.c:2438 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffff800015784e70 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:510 1 lock held by rcu_tasks_trace/13: #0: ffff800015785670 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:510 1 lock held by khungtaskd/28: #0: ffff800015784ca0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:305 2 locks held by getty/3979: #0: ffff0000d8090098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80001ba302f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1210 drivers/tty/n_tty.c:2177 2 locks held by kworker/u4:1/4290: 6 locks held by kworker/1:5/4332: #0: ffff0000c46a1138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 kernel/workqueue.c:2262 #1: ffff80001f097c20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 kernel/workqueue.c:2264 #2: ffff0000d150f190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:836 [inline] #2: ffff0000d150f190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c0/0x44a0 drivers/usb/core/hub.c:5683 #3: ffff0000c426e190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:836 [inline] #3: ffff0000c426e190 (&dev->mutex){....}-{3:3}, at: usb_disconnect+0xec/0x7b0 drivers/usb/core/hub.c:2229 #4: ffff0000c426a118 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:836 [inline] #4: ffff0000c426a118 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1078 [inline] #4: ffff0000c426a118 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xbc/0x724 drivers/base/dd.c:1281 #5: ffff800016fa4b50 (minor_rwsem#2){++++}-{3:3}, at: usb_deregister_dev+0xb8/0x304 drivers/usb/core/file.c:239 2 locks held by kworker/u4:8/9466: 2 locks held by syz-executor.5/14983: #0: ffff800016fa4b50 (minor_rwsem#2){++++}-{3:3}, at: usb_open+0x3c/0x2c4 drivers/usb/core/file.c:39 #1: ffff0000c97860d0 (&(sisusb->lock)){+.+.}-{3:3}, at: sisusb_open+0x98/0x3e0 drivers/usb/misc/sisusbvga/sisusb.c:2396 4 locks held by udevd/15013: #0: ffff0000c62c58b8 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0xac/0xc44 fs/seq_file.c:182 #1: ffff00012c1dc088 (&of->mutex){+.+.}-{3:3}, at: kernfs_seq_start+0x58/0x384 fs/kernfs/file.c:150 #2: ffff0000c33f4830 (kn->active#9){.+.+}-{0:0}, at: kernfs_seq_start+0x74/0x384 fs/kernfs/file.c:151 #3: ffff0000c426e190 (&dev->mutex){....}-{3:3}, at: device_lock_interruptible include/linux/device.h:841 [inline] #3: ffff0000c426e190 (&dev->mutex){....}-{3:3}, at: manufacturer_show+0x30/0xac drivers/usb/core/sysfs.c:141 =============================================