On Wed, Nov 6, 2019 at 1:32 PM syzbot <syzbot+f41c4f7c6d8b0b778780@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: b1aa9d83 usb: raw: add raw-gadget interface > git tree: https://github.com/google/kasan.git usb-fuzzer > console output: https://syzkaller.appspot.com/x/log.txt?x=16ae2adce00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=79de80330003b5f7 > dashboard link: https://syzkaller.appspot.com/bug?extid=f41c4f7c6d8b0b778780 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10248158e00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16afbf7ce00000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+f41c4f7c6d8b0b778780@xxxxxxxxxxxxxxxxxxxxxxxxx > > INFO: task kworker/0:2:101 blocked for more than 143 seconds. > Not tainted 5.4.0-rc6+ #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > kworker/0:2 D25552 101 2 0x80004000 > Workqueue: usb_hub_wq hub_event > Call Trace: > schedule+0xca/0x250 kernel/sched/core.c:4136 > schedule_timeout+0x682/0xb20 kernel/time/timer.c:1871 > do_wait_for_common kernel/sched/completion.c:83 [inline] > __wait_for_common kernel/sched/completion.c:104 [inline] > wait_for_common kernel/sched/completion.c:115 [inline] > wait_for_completion+0x26f/0x3c0 kernel/sched/completion.c:136 > kthread_stop+0x10c/0x610 kernel/kthread.c:559 > hwrng_unregister+0x190/0x210 drivers/char/hw_random/core.c:538 > chaoskey_disconnect+0x1b2/0x200 drivers/usb/misc/chaoskey.c:232 > usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423 > __device_release_driver drivers/base/dd.c:1134 [inline] > device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165 > bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532 > device_del+0x420/0xb20 drivers/base/core.c:2376 > usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237 > usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2200 > hub_port_connect drivers/usb/core/hub.c:5035 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] > port_event drivers/usb/core/hub.c:5470 [inline] > hub_event+0x16f2/0x3800 drivers/usb/core/hub.c:5552 > process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 > process_scheduled_works kernel/workqueue.c:2331 [inline] > worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417 > kthread+0x318/0x420 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > INFO: task kworker/1:2:102 blocked for more than 143 seconds. > Not tainted 5.4.0-rc6+ #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > kworker/1:2 D25608 102 2 0x80004000 > Workqueue: usb_hub_wq hub_event > Call Trace: > schedule+0xca/0x250 kernel/sched/core.c:4136 > schedule_timeout+0x682/0xb20 kernel/time/timer.c:1871 > do_wait_for_common kernel/sched/completion.c:83 [inline] > __wait_for_common kernel/sched/completion.c:104 [inline] > wait_for_common kernel/sched/completion.c:115 [inline] > wait_for_completion+0x26f/0x3c0 kernel/sched/completion.c:136 > kthread_stop+0x10c/0x610 kernel/kthread.c:559 > hwrng_unregister+0x190/0x210 drivers/char/hw_random/core.c:538 > chaoskey_disconnect+0x1b2/0x200 drivers/usb/misc/chaoskey.c:232 > usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423 > __device_release_driver drivers/base/dd.c:1134 [inline] > device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165 > bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532 > device_del+0x420/0xb20 drivers/base/core.c:2376 > usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237 > usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2200 > hub_port_connect drivers/usb/core/hub.c:5035 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] > port_event drivers/usb/core/hub.c:5470 [inline] > hub_event+0x16f2/0x3800 drivers/usb/core/hub.c:5552 > process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 > process_scheduled_works kernel/workqueue.c:2331 [inline] > worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417 > kthread+0x318/0x420 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > INFO: task kworker/1:0:1732 blocked for more than 143 seconds. > Not tainted 5.4.0-rc6+ #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > kworker/1:0 D26016 1732 2 0x80004000 > Workqueue: usb_hub_wq hub_event > Call Trace: > schedule+0xca/0x250 kernel/sched/core.c:4136 > schedule_timeout+0x682/0xb20 kernel/time/timer.c:1871 > do_wait_for_common kernel/sched/completion.c:83 [inline] > __wait_for_common kernel/sched/completion.c:104 [inline] > wait_for_common kernel/sched/completion.c:115 [inline] > wait_for_completion+0x26f/0x3c0 kernel/sched/completion.c:136 > kthread_stop+0x10c/0x610 kernel/kthread.c:559 > hwrng_unregister+0x190/0x210 drivers/char/hw_random/core.c:538 > chaoskey_disconnect+0x1b2/0x200 drivers/usb/misc/chaoskey.c:232 > usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423 > __device_release_driver drivers/base/dd.c:1134 [inline] > device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165 > bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532 > device_del+0x420/0xb20 drivers/base/core.c:2376 > usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237 > usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2200 > hub_port_connect drivers/usb/core/hub.c:5035 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] > port_event drivers/usb/core/hub.c:5470 [inline] > hub_event+0x16f2/0x3800 drivers/usb/core/hub.c:5552 > process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 > process_scheduled_works kernel/workqueue.c:2331 [inline] > worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417 > kthread+0x318/0x420 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > INFO: task kworker/1:3:1733 blocked for more than 144 seconds. > Not tainted 5.4.0-rc6+ #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > kworker/1:3 D26016 1733 2 0x80004000 > Workqueue: usb_hub_wq hub_event > Call Trace: > schedule+0xca/0x250 kernel/sched/core.c:4136 > schedule_timeout+0x682/0xb20 kernel/time/timer.c:1871 > do_wait_for_common kernel/sched/completion.c:83 [inline] > __wait_for_common kernel/sched/completion.c:104 [inline] > wait_for_common kernel/sched/completion.c:115 [inline] > wait_for_completion+0x26f/0x3c0 kernel/sched/completion.c:136 > kthread_stop+0x10c/0x610 kernel/kthread.c:559 > hwrng_unregister+0x190/0x210 drivers/char/hw_random/core.c:538 > chaoskey_disconnect+0x1b2/0x200 drivers/usb/misc/chaoskey.c:232 > usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423 > __device_release_driver drivers/base/dd.c:1134 [inline] > device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165 > bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532 > device_del+0x420/0xb20 drivers/base/core.c:2376 > usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237 > usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2200 > hub_port_connect drivers/usb/core/hub.c:5035 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] > port_event drivers/usb/core/hub.c:5470 [inline] > hub_event+0x16f2/0x3800 drivers/usb/core/hub.c:5552 > process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 > process_scheduled_works kernel/workqueue.c:2331 [inline] > worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417 > kthread+0x318/0x420 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > INFO: task kworker/1:4:1735 blocked for more than 144 seconds. > Not tainted 5.4.0-rc6+ #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > kworker/1:4 D25760 1735 2 0x80004000 > Workqueue: usb_hub_wq hub_event > Call Trace: > schedule+0xca/0x250 kernel/sched/core.c:4136 > schedule_timeout+0x682/0xb20 kernel/time/timer.c:1871 > do_wait_for_common kernel/sched/completion.c:83 [inline] > __wait_for_common kernel/sched/completion.c:104 [inline] > wait_for_common kernel/sched/completion.c:115 [inline] > wait_for_completion+0x26f/0x3c0 kernel/sched/completion.c:136 > kthread_stop+0x10c/0x610 kernel/kthread.c:559 > hwrng_unregister+0x190/0x210 drivers/char/hw_random/core.c:538 > chaoskey_disconnect+0x1b2/0x200 drivers/usb/misc/chaoskey.c:232 > usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423 > __device_release_driver drivers/base/dd.c:1134 [inline] > device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165 > bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532 > device_del+0x420/0xb20 drivers/base/core.c:2376 > usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237 > usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2200 > hub_port_connect drivers/usb/core/hub.c:5035 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] > port_event drivers/usb/core/hub.c:5470 [inline] > hub_event+0x16f2/0x3800 drivers/usb/core/hub.c:5552 > process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 > process_scheduled_works kernel/workqueue.c:2331 [inline] > worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417 > kthread+0x318/0x420 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > > Showing all locks held in the system: > 5 locks held by kworker/1:1/22: > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > __write_once_size include/linux/compiler.h:226 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set > include/asm-generic/atomic-instrumented.h:855 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > atomic_long_set include/asm-generic/atomic-long.h:40 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data > kernel/workqueue.c:620 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > process_one_work+0x827/0x1530 kernel/workqueue.c:2240 > #1: ffff8881d932fdd0 ((work_completion)(&hub->events)){+.+.}, at: > process_one_work+0x85b/0x1530 kernel/workqueue.c:2244 > #2: ffff8881d515c200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #2: ffff8881d515c200 (&dev->mutex){....}, at: hub_event+0x1b2/0x3800 > drivers/usb/core/hub.c:5498 > #3: ffff8881cb4fd200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #3: ffff8881cb4fd200 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0 > drivers/usb/core/hub.c:2191 > #4: ffff8881cb4fe190 (&dev->mutex){....}, at: > device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162 > 1 lock held by khungtaskd/23: > #0: ffffffff86cfe8a0 (rcu_read_lock){....}, at: > debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:5335 > 5 locks held by kworker/0:2/101: > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > __write_once_size include/linux/compiler.h:226 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set > include/asm-generic/atomic-instrumented.h:855 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > atomic_long_set include/asm-generic/atomic-long.h:40 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data > kernel/workqueue.c:620 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > process_one_work+0x827/0x1530 kernel/workqueue.c:2240 > #1: ffff8881d536fdd0 ((work_completion)(&hub->events)){+.+.}, at: > process_one_work+0x85b/0x1530 kernel/workqueue.c:2244 > #2: ffff8881d50a1200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #2: ffff8881d50a1200 (&dev->mutex){....}, at: hub_event+0x1b2/0x3800 > drivers/usb/core/hub.c:5498 > #3: ffff8881cffb7200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #3: ffff8881cffb7200 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0 > drivers/usb/core/hub.c:2191 > #4: ffff8881cf220190 (&dev->mutex){....}, at: > device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162 > 5 locks held by kworker/1:2/102: > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > __write_once_size include/linux/compiler.h:226 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set > include/asm-generic/atomic-instrumented.h:855 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > atomic_long_set include/asm-generic/atomic-long.h:40 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data > kernel/workqueue.c:620 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > process_one_work+0x827/0x1530 kernel/workqueue.c:2240 > #1: ffff8881d53d7dd0 ((work_completion)(&hub->events)){+.+.}, at: > process_one_work+0x85b/0x1530 kernel/workqueue.c:2244 > #2: ffff8881d50d0200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #2: ffff8881d50d0200 (&dev->mutex){....}, at: hub_event+0x1b2/0x3800 > drivers/usb/core/hub.c:5498 > #3: ffff8881cea1b200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #3: ffff8881cea1b200 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0 > drivers/usb/core/hub.c:2191 > #4: ffff8881cea1c190 (&dev->mutex){....}, at: > device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162 > 1 lock held by rsyslogd/1599: > #0: ffff8881d3aaad60 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 > fs/file.c:801 > 2 locks held by getty/1690: > #0: ffff8881d1458090 (&tty->ldisc_sem){++++}, at: > tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 > #1: ffffc900004492e0 (&ldata->atomic_read_lock){+.+.}, at: > n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 > 2 locks held by getty/1691: > #0: ffff8881d1569090 (&tty->ldisc_sem){++++}, at: > tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 > #1: ffffc900004692e0 (&ldata->atomic_read_lock){+.+.}, at: > n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 > 2 locks held by getty/1692: > #0: ffff8881d1430090 (&tty->ldisc_sem){++++}, at: > tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 > #1: ffffc9000044d2e0 (&ldata->atomic_read_lock){+.+.}, at: > n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 > 2 locks held by getty/1693: > #0: ffff8881d1436090 (&tty->ldisc_sem){++++}, at: > tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 > #1: ffffc900004552e0 (&ldata->atomic_read_lock){+.+.}, at: > n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 > 2 locks held by getty/1694: > #0: ffff8881d145e090 (&tty->ldisc_sem){++++}, at: > tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 > #1: ffffc9000045d2e0 (&ldata->atomic_read_lock){+.+.}, at: > n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 > 2 locks held by getty/1695: > #0: ffff8881d156a090 (&tty->ldisc_sem){++++}, at: > tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 > #1: ffffc9000046d2e0 (&ldata->atomic_read_lock){+.+.}, at: > n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 > 2 locks held by getty/1696: > #0: ffff8881d2225090 (&tty->ldisc_sem){++++}, at: > tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 > #1: ffffc900004352e0 (&ldata->atomic_read_lock){+.+.}, at: > n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 > 5 locks held by kworker/1:0/1732: > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > __write_once_size include/linux/compiler.h:226 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set > include/asm-generic/atomic-instrumented.h:855 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > atomic_long_set include/asm-generic/atomic-long.h:40 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data > kernel/workqueue.c:620 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > process_one_work+0x827/0x1530 kernel/workqueue.c:2240 > #1: ffff8881cfa67dd0 ((work_completion)(&hub->events)){+.+.}, at: > process_one_work+0x85b/0x1530 kernel/workqueue.c:2244 > #2: ffff8881d512d200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #2: ffff8881d512d200 (&dev->mutex){....}, at: hub_event+0x1b2/0x3800 > drivers/usb/core/hub.c:5498 > #3: ffff8881cf153200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #3: ffff8881cf153200 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0 > drivers/usb/core/hub.c:2191 > #4: ffff8881cf156190 (&dev->mutex){....}, at: > device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162 > 5 locks held by kworker/1:3/1733: > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > __write_once_size include/linux/compiler.h:226 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set > include/asm-generic/atomic-instrumented.h:855 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > atomic_long_set include/asm-generic/atomic-long.h:40 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data > kernel/workqueue.c:620 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > process_one_work+0x827/0x1530 kernel/workqueue.c:2240 > #1: ffff8881d024fdd0 ((work_completion)(&hub->events)){+.+.}, at: > process_one_work+0x85b/0x1530 kernel/workqueue.c:2244 > #2: ffff8881d50d7200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #2: ffff8881d50d7200 (&dev->mutex){....}, at: hub_event+0x1b2/0x3800 > drivers/usb/core/hub.c:5498 > #3: ffff8881c5fe9200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #3: ffff8881c5fe9200 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0 > drivers/usb/core/hub.c:2191 > #4: ffff8881c5feb190 (&dev->mutex){....}, at: > device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162 > 5 locks held by kworker/1:4/1735: > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > __write_once_size include/linux/compiler.h:226 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set > include/asm-generic/atomic-instrumented.h:855 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > atomic_long_set include/asm-generic/atomic-long.h:40 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data > kernel/workqueue.c:620 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > process_one_work+0x827/0x1530 kernel/workqueue.c:2240 > #1: ffff8881cfaa7dd0 ((work_completion)(&hub->events)){+.+.}, at: > process_one_work+0x85b/0x1530 kernel/workqueue.c:2244 > #2: ffff8881d510e200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #2: ffff8881d510e200 (&dev->mutex){....}, at: hub_event+0x1b2/0x3800 > drivers/usb/core/hub.c:5498 > #3: ffff8881cf982200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #3: ffff8881cf982200 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0 > drivers/usb/core/hub.c:2191 > #4: ffff8881cf400190 (&dev->mutex){....}, at: > device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162 > > ============================================= > > NMI backtrace for cpu 0 > CPU: 0 PID: 23 Comm: khungtaskd Not tainted 5.4.0-rc6+ #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0xca/0x13e lib/dump_stack.c:113 > nmi_cpu_backtrace.cold+0x55/0x96 lib/nmi_backtrace.c:101 > nmi_trigger_cpumask_backtrace+0x1b0/0x1c7 lib/nmi_backtrace.c:62 > trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] > check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] > watchdog+0x9a4/0xe50 kernel/hung_task.c:289 > kthread+0x318/0x420 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > Sending NMI from CPU 0 to CPUs 1: > NMI backtrace for cpu 1 skipped: idling at native_safe_halt > arch/x86/include/asm/irqflags.h:60 [inline] > NMI backtrace for cpu 1 skipped: idling at arch_safe_halt > arch/x86/include/asm/irqflags.h:103 [inline] > NMI backtrace for cpu 1 skipped: idling at default_idle+0x28/0x2e0 > arch/x86/kernel/process.c:580 > > > --- > This bug is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches Closing old USB bugs that haven't happened for a long time. #syz invalid
