On Tue, Jul 23, 2019 at 2:48 PM syzbot <syzbot+823cb2bdae0c63b2cb9f@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: 6a3599ce usb-fuzzer: main usb gadget fuzzer driver > git tree: https://github.com/google/kasan.git usb-fuzzer > console output: https://syzkaller.appspot.com/x/log.txt?x=1266ca64600000 > kernel config: https://syzkaller.appspot.com/x/.config?x=700ca426ab83faae > dashboard link: https://syzkaller.appspot.com/bug?extid=823cb2bdae0c63b2cb9f > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=143d46f4600000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1789853fa00000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+823cb2bdae0c63b2cb9f@xxxxxxxxxxxxxxxxxxxxxxxxx > > INFO: task kworker/0:0:5 blocked for more than 143 seconds. > Not tainted 5.2.0-rc6+ #15 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > kworker/0:0 D26088 5 2 0x80004000 > Workqueue: usb_hub_wq hub_event > Call Trace: > schedule+0x96/0x240 /kernel/sched/core.c:3509 > schedule_timeout+0x682/0xb20 /kernel/time/timer.c:1783 > 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+0xe6/0x5a0 /kernel/kthread.c:559 > hwrng_unregister+0x190/0x210 /drivers/char/hw_random/core.c:535 > chaoskey_disconnect+0x1b2/0x200 /drivers/usb/misc/chaoskey.c:231 > usb_unbind_interface+0x1bd/0x8a0 /drivers/usb/core/driver.c:423 > __device_release_driver /drivers/base/dd.c:1081 [inline] > device_release_driver_internal+0x404/0x4c0 /drivers/base/dd.c:1112 > bus_remove_device+0x2dc/0x4a0 /drivers/base/bus.c:556 > device_del+0x460/0xb80 /drivers/base/core.c:2274 > usb_disable_device+0x211/0x690 /drivers/usb/core/message.c:1237 > usb_disconnect+0x284/0x830 /drivers/usb/core/hub.c:2199 > hub_port_connect /drivers/usb/core/hub.c:4949 [inline] > hub_port_connect_change /drivers/usb/core/hub.c:5213 [inline] > port_event /drivers/usb/core/hub.c:5359 [inline] > hub_event+0x13bd/0x3550 /drivers/usb/core/hub.c:5441 > process_one_work+0x905/0x1570 /kernel/workqueue.c:2269 > process_scheduled_works /kernel/workqueue.c:2331 [inline] > worker_thread+0x7ab/0xe20 /kernel/workqueue.c:2417 > kthread+0x30b/0x410 /kernel/kthread.c:255 > ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:352 > INFO: task kworker/1:1:21 blocked for more than 143 seconds. > Not tainted 5.2.0-rc6+ #15 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > kworker/1:1 D25576 21 2 0x80004000 > Workqueue: usb_hub_wq hub_event > Call Trace: > schedule+0x96/0x240 /kernel/sched/core.c:3509 > schedule_timeout+0x682/0xb20 /kernel/time/timer.c:1783 > 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+0xe6/0x5a0 /kernel/kthread.c:559 > hwrng_unregister+0x190/0x210 /drivers/char/hw_random/core.c:535 > chaoskey_disconnect+0x1b2/0x200 /drivers/usb/misc/chaoskey.c:231 > usb_unbind_interface+0x1bd/0x8a0 /drivers/usb/core/driver.c:423 > __device_release_driver /drivers/base/dd.c:1081 [inline] > device_release_driver_internal+0x404/0x4c0 /drivers/base/dd.c:1112 > bus_remove_device+0x2dc/0x4a0 /drivers/base/bus.c:556 > device_del+0x460/0xb80 /drivers/base/core.c:2274 > usb_disable_device+0x211/0x690 /drivers/usb/core/message.c:1237 > usb_disconnect+0x284/0x830 /drivers/usb/core/hub.c:2199 > hub_port_connect /drivers/usb/core/hub.c:4949 [inline] > hub_port_connect_change /drivers/usb/core/hub.c:5213 [inline] > port_event /drivers/usb/core/hub.c:5359 [inline] > hub_event+0x13bd/0x3550 /drivers/usb/core/hub.c:5441 > process_one_work+0x905/0x1570 /kernel/workqueue.c:2269 > process_scheduled_works /kernel/workqueue.c:2331 [inline] > worker_thread+0x7ab/0xe20 /kernel/workqueue.c:2417 > kthread+0x30b/0x410 /kernel/kthread.c:255 > ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:352 > INFO: task kworker/0:2:107 blocked for more than 143 seconds. > Not tainted 5.2.0-rc6+ #15 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > kworker/0:2 D25688 107 2 0x80004000 > Workqueue: usb_hub_wq hub_event > Call Trace: > schedule+0x96/0x240 /kernel/sched/core.c:3509 > schedule_timeout+0x682/0xb20 /kernel/time/timer.c:1783 > 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+0xe6/0x5a0 /kernel/kthread.c:559 > hwrng_unregister+0x190/0x210 /drivers/char/hw_random/core.c:535 > chaoskey_disconnect+0x1b2/0x200 /drivers/usb/misc/chaoskey.c:231 > usb_unbind_interface+0x1bd/0x8a0 /drivers/usb/core/driver.c:423 > __device_release_driver /drivers/base/dd.c:1081 [inline] > device_release_driver_internal+0x404/0x4c0 /drivers/base/dd.c:1112 > bus_remove_device+0x2dc/0x4a0 /drivers/base/bus.c:556 > device_del+0x460/0xb80 /drivers/base/core.c:2274 > usb_disable_device+0x211/0x690 /drivers/usb/core/message.c:1237 > usb_disconnect+0x284/0x830 /drivers/usb/core/hub.c:2199 > hub_port_connect /drivers/usb/core/hub.c:4949 [inline] > hub_port_connect_change /drivers/usb/core/hub.c:5213 [inline] > port_event /drivers/usb/core/hub.c:5359 [inline] > hub_event+0x13bd/0x3550 /drivers/usb/core/hub.c:5441 > process_one_work+0x905/0x1570 /kernel/workqueue.c:2269 > process_scheduled_works /kernel/workqueue.c:2331 [inline] > worker_thread+0x7ab/0xe20 /kernel/workqueue.c:2417 > kthread+0x30b/0x410 /kernel/kthread.c:255 > ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:352 > INFO: task kworker/1:2:108 blocked for more than 144 seconds. > Not tainted 5.2.0-rc6+ #15 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > kworker/1:2 D26088 108 2 0x80004000 > Workqueue: usb_hub_wq hub_event > Call Trace: > schedule+0x96/0x240 /kernel/sched/core.c:3509 > schedule_timeout+0x682/0xb20 /kernel/time/timer.c:1783 > 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+0xe6/0x5a0 /kernel/kthread.c:559 > hwrng_unregister+0x190/0x210 /drivers/char/hw_random/core.c:535 > chaoskey_disconnect+0x1b2/0x200 /drivers/usb/misc/chaoskey.c:231 > usb_unbind_interface+0x1bd/0x8a0 /drivers/usb/core/driver.c:423 > __device_release_driver /drivers/base/dd.c:1081 [inline] > device_release_driver_internal+0x404/0x4c0 /drivers/base/dd.c:1112 > bus_remove_device+0x2dc/0x4a0 /drivers/base/bus.c:556 > device_del+0x460/0xb80 /drivers/base/core.c:2274 > usb_disable_device+0x211/0x690 /drivers/usb/core/message.c:1237 > usb_disconnect+0x284/0x830 /drivers/usb/core/hub.c:2199 > hub_port_connect /drivers/usb/core/hub.c:4949 [inline] > hub_port_connect_change /drivers/usb/core/hub.c:5213 [inline] > port_event /drivers/usb/core/hub.c:5359 [inline] > hub_event+0x13bd/0x3550 /drivers/usb/core/hub.c:5441 > process_one_work+0x905/0x1570 /kernel/workqueue.c:2269 > process_scheduled_works /kernel/workqueue.c:2331 [inline] > worker_thread+0x7ab/0xe20 /kernel/workqueue.c:2417 > kthread+0x30b/0x410 /kernel/kthread.c:255 > ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:352 > INFO: task kworker/1:0:1743 blocked for more than 144 seconds. > Not tainted 5.2.0-rc6+ #15 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > kworker/1:0 D26088 1743 2 0x80004000 > Workqueue: usb_hub_wq hub_event > Call Trace: > schedule+0x96/0x240 /kernel/sched/core.c:3509 > schedule_timeout+0x682/0xb20 /kernel/time/timer.c:1783 > 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+0xe6/0x5a0 /kernel/kthread.c:559 > hwrng_unregister+0x190/0x210 /drivers/char/hw_random/core.c:535 > chaoskey_disconnect+0x1b2/0x200 /drivers/usb/misc/chaoskey.c:231 > usb_unbind_interface+0x1bd/0x8a0 /drivers/usb/core/driver.c:423 > __device_release_driver /drivers/base/dd.c:1081 [inline] > device_release_driver_internal+0x404/0x4c0 /drivers/base/dd.c:1112 > bus_remove_device+0x2dc/0x4a0 /drivers/base/bus.c:556 > device_del+0x460/0xb80 /drivers/base/core.c:2274 > usb_disable_device+0x211/0x690 /drivers/usb/core/message.c:1237 > usb_disconnect+0x284/0x830 /drivers/usb/core/hub.c:2199 > hub_port_connect /drivers/usb/core/hub.c:4949 [inline] > hub_port_connect_change /drivers/usb/core/hub.c:5213 [inline] > port_event /drivers/usb/core/hub.c:5359 [inline] > hub_event+0x13bd/0x3550 /drivers/usb/core/hub.c:5441 > process_one_work+0x905/0x1570 /kernel/workqueue.c:2269 > process_scheduled_works /kernel/workqueue.c:2331 [inline] > worker_thread+0x7ab/0xe20 /kernel/workqueue.c:2417 > kthread+0x30b/0x410 /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/0:0/5: > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > __write_once_size /./include/linux/compiler.h:221 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > arch_atomic64_set /./arch/x86/include/asm/atomic64_64.h:34 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set > /./include/asm-generic/atomic-instrumented.h:855 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > atomic_long_set /./include/asm-generic/atomic-long.h:40 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data > /kernel/workqueue.c:620 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > set_work_pool_and_clear_pending /kernel/workqueue.c:647 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > process_one_work+0x81a/0x1570 /kernel/workqueue.c:2240 > #1: 00000000c0e8b754 ((work_completion)(&hub->events)){+.+.}, at: > process_one_work+0x84e/0x1570 /kernel/workqueue.c:2244 > #2: 00000000b363c0f6 (&dev->mutex){....}, at: device_lock > /./include/linux/device.h:1208 [inline] > #2: 00000000b363c0f6 (&dev->mutex){....}, at: hub_event+0x179/0x3550 > /drivers/usb/core/hub.c:5387 > #3: 0000000085e6ee8d (&dev->mutex){....}, at: device_lock > /./include/linux/device.h:1208 [inline] > #3: 0000000085e6ee8d (&dev->mutex){....}, at: usb_disconnect+0x91/0x830 > /drivers/usb/core/hub.c:2190 > #4: 00000000f0ac3a42 (&dev->mutex){....}, at: > device_release_driver_internal+0x23/0x4c0 /drivers/base/dd.c:1109 > 5 locks held by kworker/1:1/21: > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > __write_once_size /./include/linux/compiler.h:221 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > arch_atomic64_set /./arch/x86/include/asm/atomic64_64.h:34 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set > /./include/asm-generic/atomic-instrumented.h:855 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > atomic_long_set /./include/asm-generic/atomic-long.h:40 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data > /kernel/workqueue.c:620 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > set_work_pool_and_clear_pending /kernel/workqueue.c:647 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > process_one_work+0x81a/0x1570 /kernel/workqueue.c:2240 > #1: 00000000e4cc4967 ((work_completion)(&hub->events)){+.+.}, at: > process_one_work+0x84e/0x1570 /kernel/workqueue.c:2244 > #2: 000000009fad33ce (&dev->mutex){....}, at: device_lock > /./include/linux/device.h:1208 [inline] > #2: 000000009fad33ce (&dev->mutex){....}, at: hub_event+0x179/0x3550 > /drivers/usb/core/hub.c:5387 > #3: 0000000054332177 (&dev->mutex){....}, at: device_lock > /./include/linux/device.h:1208 [inline] > #3: 0000000054332177 (&dev->mutex){....}, at: usb_disconnect+0x91/0x830 > /drivers/usb/core/hub.c:2190 > #4: 0000000024af6192 (&dev->mutex){....}, at: > device_release_driver_internal+0x23/0x4c0 /drivers/base/dd.c:1109 > 1 lock held by khungtaskd/23: > #0: 00000000c34a6907 (rcu_read_lock){....}, at: > debug_show_all_locks+0x53/0x269 /kernel/locking/lockdep.c:5147 > 5 locks held by kworker/0:2/107: > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > __write_once_size /./include/linux/compiler.h:221 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > arch_atomic64_set /./arch/x86/include/asm/atomic64_64.h:34 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set > /./include/asm-generic/atomic-instrumented.h:855 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > atomic_long_set /./include/asm-generic/atomic-long.h:40 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data > /kernel/workqueue.c:620 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > set_work_pool_and_clear_pending /kernel/workqueue.c:647 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > process_one_work+0x81a/0x1570 /kernel/workqueue.c:2240 > #1: 00000000123183b4 ((work_completion)(&hub->events)){+.+.}, at: > process_one_work+0x84e/0x1570 /kernel/workqueue.c:2244 > #2: 0000000052b6f3e1 (&dev->mutex){....}, at: device_lock > /./include/linux/device.h:1208 [inline] > #2: 0000000052b6f3e1 (&dev->mutex){....}, at: hub_event+0x179/0x3550 > /drivers/usb/core/hub.c:5387 > #3: 0000000074cd949e (&dev->mutex){....}, at: device_lock > /./include/linux/device.h:1208 [inline] > #3: 0000000074cd949e (&dev->mutex){....}, at: usb_disconnect+0x91/0x830 > /drivers/usb/core/hub.c:2190 > #4: 000000004b055abd (&dev->mutex){....}, at: > device_release_driver_internal+0x23/0x4c0 /drivers/base/dd.c:1109 > 5 locks held by kworker/1:2/108: > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > __write_once_size /./include/linux/compiler.h:221 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > arch_atomic64_set /./arch/x86/include/asm/atomic64_64.h:34 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set > /./include/asm-generic/atomic-instrumented.h:855 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > atomic_long_set /./include/asm-generic/atomic-long.h:40 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data > /kernel/workqueue.c:620 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > set_work_pool_and_clear_pending /kernel/workqueue.c:647 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > process_one_work+0x81a/0x1570 /kernel/workqueue.c:2240 > #1: 00000000e35f89a1 ((work_completion)(&hub->events)){+.+.}, at: > process_one_work+0x84e/0x1570 /kernel/workqueue.c:2244 > #2: 00000000b09f111f (&dev->mutex){....}, at: device_lock > /./include/linux/device.h:1208 [inline] > #2: 00000000b09f111f (&dev->mutex){....}, at: hub_event+0x179/0x3550 > /drivers/usb/core/hub.c:5387 > #3: 000000006b5fbeae (&dev->mutex){....}, at: device_lock > /./include/linux/device.h:1208 [inline] > #3: 000000006b5fbeae (&dev->mutex){....}, at: usb_disconnect+0x91/0x830 > /drivers/usb/core/hub.c:2190 > #4: 0000000081dcaa24 (&dev->mutex){....}, at: > device_release_driver_internal+0x23/0x4c0 /drivers/base/dd.c:1109 > 1 lock held by rsyslogd/1609: > #0: 00000000d7f3ff94 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 > /fs/file.c:801 > 2 locks held by getty/1699: > #0: 00000000bc736fb1 (&tty->ldisc_sem){++++}, at: > tty_ldisc_ref_wait+0x22/0x80 /drivers/tty/tty_ldisc.c:272 > #1: 0000000014dfa3bf (&ldata->atomic_read_lock){+.+.}, at: > n_tty_read+0x217/0x1a50 /drivers/tty/n_tty.c:2156 > 2 locks held by getty/1700: > #0: 00000000be14d894 (&tty->ldisc_sem){++++}, at: > tty_ldisc_ref_wait+0x22/0x80 /drivers/tty/tty_ldisc.c:272 > #1: 00000000ff0e9bac (&ldata->atomic_read_lock){+.+.}, at: > n_tty_read+0x217/0x1a50 /drivers/tty/n_tty.c:2156 > 2 locks held by getty/1701: > #0: 00000000d0e4fddf (&tty->ldisc_sem){++++}, at: > tty_ldisc_ref_wait+0x22/0x80 /drivers/tty/tty_ldisc.c:272 > #1: 000000004b19a9d4 (&ldata->atomic_read_lock){+.+.}, at: > n_tty_read+0x217/0x1a50 /drivers/tty/n_tty.c:2156 > 2 locks held by getty/1702: > #0: 00000000c1b6c003 (&tty->ldisc_sem){++++}, at: > tty_ldisc_ref_wait+0x22/0x80 /drivers/tty/tty_ldisc.c:272 > #1: 0000000099fff3a4 (&ldata->atomic_read_lock){+.+.}, at: > n_tty_read+0x217/0x1a50 /drivers/tty/n_tty.c:2156 > 2 locks held by getty/1703: > #0: 000000008cc2d327 (&tty->ldisc_sem){++++}, at: > tty_ldisc_ref_wait+0x22/0x80 /drivers/tty/tty_ldisc.c:272 > #1: 0000000056f83ac4 (&ldata->atomic_read_lock){+.+.}, at: > n_tty_read+0x217/0x1a50 /drivers/tty/n_tty.c:2156 > 2 locks held by getty/1704: > #0: 000000000eebfa14 (&tty->ldisc_sem){++++}, at: > tty_ldisc_ref_wait+0x22/0x80 /drivers/tty/tty_ldisc.c:272 > #1: 00000000a2f569ec (&ldata->atomic_read_lock){+.+.}, at: > n_tty_read+0x217/0x1a50 /drivers/tty/n_tty.c:2156 > 2 locks held by getty/1705: > #0: 0000000055305a29 (&tty->ldisc_sem){++++}, at: > tty_ldisc_ref_wait+0x22/0x80 /drivers/tty/tty_ldisc.c:272 > #1: 000000001cc6455d (&ldata->atomic_read_lock){+.+.}, at: > n_tty_read+0x217/0x1a50 /drivers/tty/n_tty.c:2156 > 5 locks held by kworker/1:0/1743: > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > __write_once_size /./include/linux/compiler.h:221 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > arch_atomic64_set /./arch/x86/include/asm/atomic64_64.h:34 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set > /./include/asm-generic/atomic-instrumented.h:855 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > atomic_long_set /./include/asm-generic/atomic-long.h:40 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data > /kernel/workqueue.c:620 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > set_work_pool_and_clear_pending /kernel/workqueue.c:647 [inline] > #0: 000000008d4a8324 ((wq_completion)usb_hub_wq){+.+.}, at: > process_one_work+0x81a/0x1570 /kernel/workqueue.c:2240 > #1: 00000000f376c2ba ((work_completion)(&hub->events)){+.+.}, at: > process_one_work+0x84e/0x1570 /kernel/workqueue.c:2244 > #2: 000000007ee3f09e (&dev->mutex){....}, at: device_lock > /./include/linux/device.h:1208 [inline] > #2: 000000007ee3f09e (&dev->mutex){....}, at: hub_event+0x179/0x3550 > /drivers/usb/core/hub.c:5387 > #3: 00000000250c1adb (&dev->mutex){....}, at: device_lock > /./include/linux/device.h:1208 [inline] > #3: 00000000250c1adb (&dev->mutex){....}, at: usb_disconnect+0x91/0x830 > /drivers/usb/core/hub.c:2190 > #4: 00000000538ed281 (&dev->mutex){....}, at: > device_release_driver_internal+0x23/0x4c0 /drivers/base/dd.c:1109 > 5 locks held by kworker/0:1/1745: > > ============================================= > > NMI backtrace for cpu 0 > CPU: 0 PID: 23 Comm: khungtaskd Not tainted 5.2.0-rc6+ #15 > 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+0x48/0x87 /lib/nmi_backtrace.c:101 > nmi_trigger_cpumask_backtrace+0x1a6/0x1bd /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+0x989/0xe20 /kernel/hung_task.c:289 > kthread+0x30b/0x410 /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+0x28/0x2b0 > /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 #syz dup: INFO: task hung in chaoskey_disconnect
