syzbot

INFO: task syz.0.19:6788 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.19        state:D stack:0     pid:6788  tgid:6788  ppid:6701   task_flags:0x400040 flags:0x00000001
Call trace:
 __switch_to+0x418/0x87c arch/arm64/kernel/process.c:742 (T)
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x1250/0x2a7c kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0xb4/0x230 kernel/sched/core.c:6960
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7017
 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:692
 __mutex_lock kernel/locking/mutex.c:776 [inline]
 mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828
 device_lock include/linux/device.h:895 [inline]
 usbdev_release+0x78/0x6a8 drivers/usb/core/devio.c:1099
 __fput+0x340/0x75c fs/file_table.c:468
 ____fput+0x20/0x58 fs/file_table.c:496
 task_work_run+0x1dc/0x260 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
 exit_to_user_mode_loop+0x10c/0x18c kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 exit_to_user_mode_prepare_legacy include/linux/irq-entry-common.h:242 [inline]
 arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:81 [inline]
 el0_svc+0x17c/0x26c arch/arm64/kernel/entry-common.c:725
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

Showing all locks held in the system:
1 lock held by khungtaskd/32:
 #0: ffff80008fa5b6e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330
2 locks held by pr/ttyAMA-1/43:
5 locks held by kworker/1:3/6177:
 #0: ffff0000c31f8d48 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231
 #1: ffff8000a4ea7be0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231
 #2: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline]
 #2: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: hub_event+0x13c/0x3f0c drivers/usb/core/hub.c:5899
 #3: ffff0000cfc65528 (&port_dev->status_lock){+.+.}-{4:4}, at: usb_lock_port drivers/usb/core/hub.c:3252 [inline]
 #3: ffff0000cfc65528 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect drivers/usb/core/hub.c:5464 [inline]
 #3: ffff0000cfc65528 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
 #3: ffff0000cfc65528 (&port_dev->status_lock){+.+.}-{4:4}, at: port_event drivers/usb/core/hub.c:5871 [inline]
 #3: ffff0000cfc65528 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_event+0x1abc/0x3f0c drivers/usb/core/hub.c:5953
 #4: ffff0000cf539d68 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_port_connect drivers/usb/core/hub.c:5465 [inline]
 #4: ffff0000cf539d68 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
 #4: ffff0000cf539d68 (hcd->address0_mutex){+.+.}-{4:4}, at: port_event drivers/usb/core/hub.c:5871 [inline]
 #4: ffff0000cf539d68 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_event+0x1ae4/0x3f0c drivers/usb/core/hub.c:5953
2 locks held by getty/6353:
 #0: ffff0000d49cc0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff800099f1e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x34c/0xfc8 drivers/tty/n_tty.c:2211
1 lock held by syz.0.19/6788:
 #0: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline]
 #0: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: usbdev_release+0x78/0x6a8 drivers/usb/core/devio.c:1099
1 lock held by syz.1.20/6815:
 #0: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline]
 #0: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x128/0x65c drivers/usb/core/devio.c:1054
1 lock held by syz.2.21/6841:
 #0: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline]
 #0: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x128/0x65c drivers/usb/core/devio.c:1054
1 lock held by syz.3.22/6867:
 #0: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline]
 #0: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x128/0x65c drivers/usb/core/devio.c:1054
1 lock held by syz.4.23/6905:
 #0: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline]
 #0: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x128/0x65c drivers/usb/core/devio.c:1054
1 lock held by syz.5.24/6941:
 #0: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline]
 #0: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x128/0x65c drivers/usb/core/devio.c:1054
1 lock held by syz.6.25/6976:
 #0: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline]
 #0: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x128/0x65c drivers/usb/core/devio.c:1054
1 lock held by syz.7.26/7012:
 #0: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline]
 #0: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x128/0x65c drivers/usb/core/devio.c:1054
1 lock held by syz.8.27/7051:
 #0: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline]
 #0: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x128/0x65c drivers/usb/core/devio.c:1054
1 lock held by syz.9.28/7089:
 #0: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline]
 #0: ffff0000cfc61198 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x128/0x65c drivers/usb/core/devio.c:1054

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