INFO: task kworker/0:5:3240 blocked for more than 143 seconds. Not tainted 5.3.0+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:5 D25376 3240 2 0x80004000 Workqueue: usb_hub_wq hub_event Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4132 schedule_timeout+0x440/0xb20 kernel/time/timer.c:1893 usb_start_wait_urb.constprop.0+0x29d/0x2e0 drivers/net/usb/kaweth.c:1238 kaweth_internal_control_msg drivers/net/usb/kaweth.c:1274 [inline] kaweth_control.constprop.0+0x360/0x490 drivers/net/usb/kaweth.c:269 kaweth_read_configuration drivers/net/usb/kaweth.c:287 [inline] kaweth_probe.cold+0xeb/0x1205 drivers/net/usb/kaweth.c:1065 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361 really_probe+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x104/0x210 drivers/base/dd.c:721 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 device_add+0xae6/0x16f0 drivers/base/core.c:2201 usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023 generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210 usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266 really_probe+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x104/0x210 drivers/base/dd.c:721 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 device_add+0xae6/0x16f0 drivers/base/core.c:2201 usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536 hub_port_connect drivers/usb/core/hub.c:5098 [inline] hub_port_connect_change drivers/usb/core/hub.c:5213 [inline] port_event drivers/usb/core/hub.c:5359 [inline] hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441 process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 worker_thread+0x96/0xe20 kernel/workqueue.c:2415 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 INFO: task syz-executor.1:4653 blocked for more than 143 seconds. Not tainted 5.3.0+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28520 4653 1749 0x00000004 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4132 schedule_preempt_disabled+0xc/0x20 kernel/sched/core.c:4191 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x881/0x1360 kernel/locking/mutex.c:1103 device_lock include/linux/device.h:1462 [inline] usbdev_open+0x19d/0x840 drivers/usb/core/devio.c:1007 chrdev_open+0x219/0x5c0 fs/char_dev.c:414 do_dentry_open+0x494/0x1120 fs/open.c:797 do_last fs/namei.c:3408 [inline] path_openat+0x1430/0x3f50 fs/namei.c:3525 do_filp_open+0x1a1/0x280 fs/namei.c:3555 do_sys_open+0x3c0/0x580 fs/open.c:1089 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413911 Code: c3 fe ff ff 31 c0 48 89 ee bf 30 31 44 00 e8 36 d7 00 00 b8 14 fc ff ff e9 ac fe ff ff 66 66 66 2e 0f 1f 84 00 00 00 00 00 53 <48> 89 fe 48 89 fb 31 c0 bf 89 3c 44 00 e8 0d d7 00 00 66 83 bb c8 RSP: 002b:00007ff013daa7a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000413911 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007ff013daa850 RBP: 000000000075bf20 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007ff013dab6d4 R13: 00000000004c8fb6 R14: 00000000004e0138 R15: 00000000ffffffff INFO: task syz-executor.0:4661 blocked for more than 144 seconds. Not tainted 5.3.0+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28592 4661 1763 0x00004004 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4132 schedule_preempt_disabled+0xc/0x20 kernel/sched/core.c:4191 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x881/0x1360 kernel/locking/mutex.c:1103 device_lock include/linux/device.h:1462 [inline] usbdev_open+0x19d/0x840 drivers/usb/core/devio.c:1007 chrdev_open+0x219/0x5c0 fs/char_dev.c:414 do_dentry_open+0x494/0x1120 fs/open.c:797 do_last fs/namei.c:3408 [inline] path_openat+0x1430/0x3f50 fs/namei.c:3525 do_filp_open+0x1a1/0x280 fs/namei.c:3555 do_sys_open+0x3c0/0x580 fs/open.c:1089 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413911 Code: c3 fe ff ff 31 c0 48 89 ee bf 30 31 44 00 e8 36 d7 00 00 b8 14 fc ff ff e9 ac fe ff ff 66 66 66 2e 0f 1f 84 00 00 00 00 00 53 <48> 89 fe 48 89 fb 31 c0 bf 89 3c 44 00 e8 0d d7 00 00 66 83 bb c8 RSP: 002b:00007f31e5db47a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000413911 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007f31e5db4850 RBP: 000000000075bf20 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f31e5db56d4 R13: 00000000004c8fb6 R14: 00000000004e0138 R15: 00000000ffffffff INFO: task syz-executor.0:4663 blocked for more than 144 seconds. Not tainted 5.3.0+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28664 4663 1763 0x00000004 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4132 schedule_preempt_disabled+0xc/0x20 kernel/sched/core.c:4191 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x881/0x1360 kernel/locking/mutex.c:1103 device_lock include/linux/device.h:1462 [inline] usbdev_open+0x19d/0x840 drivers/usb/core/devio.c:1007 chrdev_open+0x219/0x5c0 fs/char_dev.c:414 do_dentry_open+0x494/0x1120 fs/open.c:797 do_last fs/namei.c:3408 [inline] path_openat+0x1430/0x3f50 fs/namei.c:3525 do_filp_open+0x1a1/0x280 fs/namei.c:3555 do_sys_open+0x3c0/0x580 fs/open.c:1089 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413911 Code: c3 fe ff ff 31 c0 48 89 ee bf 30 31 44 00 e8 36 d7 00 00 b8 14 fc ff ff e9 ac fe ff ff 66 66 66 2e 0f 1f 84 00 00 00 00 00 53 <48> 89 fe 48 89 fb 31 c0 bf 89 3c 44 00 e8 0d d7 00 00 66 83 bb c8 RSP: 002b:00007f31e5d937a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000413911 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007f31e5d93850 RBP: 000000000075bfc8 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f31e5d946d4 R13: 00000000004c8fb6 R14: 00000000004e0138 R15: 00000000ffffffff INFO: task syz-executor.3:4667 blocked for more than 144 seconds. Not tainted 5.3.0+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D27832 4667 1747 0x00000004 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4132 schedule_preempt_disabled+0xc/0x20 kernel/sched/core.c:4191 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x881/0x1360 kernel/locking/mutex.c:1103 device_lock include/linux/device.h:1462 [inline] usbdev_open+0x19d/0x840 drivers/usb/core/devio.c:1007 chrdev_open+0x219/0x5c0 fs/char_dev.c:414 do_dentry_open+0x494/0x1120 fs/open.c:797 do_last fs/namei.c:3408 [inline] path_openat+0x1430/0x3f50 fs/namei.c:3525 do_filp_open+0x1a1/0x280 fs/namei.c:3555 do_sys_open+0x3c0/0x580 fs/open.c:1089 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413911 Code: c3 fe ff ff 31 c0 48 89 ee bf 30 31 44 00 e8 36 d7 00 00 b8 14 fc ff ff e9 ac fe ff ff 66 66 66 2e 0f 1f 84 00 00 00 00 00 53 <48> 89 fe 48 89 fb 31 c0 bf 89 3c 44 00 e8 0d d7 00 00 66 83 bb c8 RSP: 002b:00007efe450917a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000413911 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007efe45091850 RBP: 000000000075bf20 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007efe450926d4 R13: 00000000004c8fb6 R14: 00000000004e0138 R15: 00000000ffffffff INFO: task syz-executor.3:4688 blocked for more than 145 seconds. Not tainted 5.3.0+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29424 4688 1747 0x00000004 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4132 schedule_preempt_disabled+0xc/0x20 kernel/sched/core.c:4191 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x881/0x1360 kernel/locking/mutex.c:1103 device_lock include/linux/device.h:1462 [inline] usbdev_open+0x19d/0x840 drivers/usb/core/devio.c:1007 chrdev_open+0x219/0x5c0 fs/char_dev.c:414 do_dentry_open+0x494/0x1120 fs/open.c:797 do_last fs/namei.c:3408 [inline] path_openat+0x1430/0x3f50 fs/namei.c:3525 do_filp_open+0x1a1/0x280 fs/namei.c:3555 do_sys_open+0x3c0/0x580 fs/open.c:1089 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413911 Code: c3 fe ff ff 31 c0 48 89 ee bf 30 31 44 00 e8 36 d7 00 00 b8 14 fc ff ff e9 ac fe ff ff 66 66 66 2e 0f 1f 84 00 00 00 00 00 53 <48> 89 fe 48 89 fb 31 c0 bf 89 3c 44 00 e8 0d d7 00 00 66 83 bb c8 RSP: 002b:00007efe450707a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000413911 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007efe45070850 RBP: 000000000075bfc8 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007efe450716d4 R13: 00000000004c8fb6 R14: 00000000004e0138 R15: 00000000ffffffff INFO: task syz-executor.4:4676 blocked for more than 145 seconds. Not tainted 5.3.0+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29424 4676 1756 0x00000004 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4132 schedule_preempt_disabled+0xc/0x20 kernel/sched/core.c:4191 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x881/0x1360 kernel/locking/mutex.c:1103 device_lock include/linux/device.h:1462 [inline] usbdev_open+0x19d/0x840 drivers/usb/core/devio.c:1007 chrdev_open+0x219/0x5c0 fs/char_dev.c:414 do_dentry_open+0x494/0x1120 fs/open.c:797 do_last fs/namei.c:3408 [inline] path_openat+0x1430/0x3f50 fs/namei.c:3525 do_filp_open+0x1a1/0x280 fs/namei.c:3555 do_sys_open+0x3c0/0x580 fs/open.c:1089 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413911 Code: c3 fe ff ff 31 c0 48 89 ee bf 30 31 44 00 e8 36 d7 00 00 b8 14 fc ff ff e9 ac fe ff ff 66 66 66 2e 0f 1f 84 00 00 00 00 00 53 <48> 89 fe 48 89 fb 31 c0 bf 89 3c 44 00 e8 0d d7 00 00 66 83 bb c8 RSP: 002b:00007fe523ee57a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000413911 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007fe523ee5850 RBP: 000000000075bf20 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007fe523ee66d4 R13: 00000000004c8fb6 R14: 00000000004e0138 R15: 00000000ffffffff INFO: task syz-executor.4:4677 blocked for more than 145 seconds. Not tainted 5.3.0+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29424 4677 1756 0x00000004 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4132 schedule_preempt_disabled+0xc/0x20 kernel/sched/core.c:4191 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x881/0x1360 kernel/locking/mutex.c:1103 device_lock include/linux/device.h:1462 [inline] usbdev_open+0x19d/0x840 drivers/usb/core/devio.c:1007 chrdev_open+0x219/0x5c0 fs/char_dev.c:414 do_dentry_open+0x494/0x1120 fs/open.c:797 do_last fs/namei.c:3408 [inline] path_openat+0x1430/0x3f50 fs/namei.c:3525 do_filp_open+0x1a1/0x280 fs/namei.c:3555 do_sys_open+0x3c0/0x580 fs/open.c:1089 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413911 Code: c3 fe ff ff 31 c0 48 89 ee bf 30 31 44 00 e8 36 d7 00 00 b8 14 fc ff ff e9 ac fe ff ff 66 66 66 2e 0f 1f 84 00 00 00 00 00 53 <48> 89 fe 48 89 fb 31 c0 bf 89 3c 44 00 e8 0d d7 00 00 66 83 bb c8 RSP: 002b:00007fe523ec47a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000413911 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007fe523ec4850 RBP: 000000000075bfc8 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007fe523ec56d4 R13: 00000000004c8fb6 R14: 00000000004e0138 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: ffffffff86eff3e0 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:5335 1 lock held by rsyslogd/1605: #0: ffff8881d672e5e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 fs/file.c:801 2 locks held by getty/1695: #0: ffff8881d909ab10 (&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/1696: #0: ffff8881d9136f10 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: ffffc900004452e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1697: #0: ffff8881d755e690 (&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/1698: #0: ffff8881d909d590 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: ffffc900004512e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1699: #0: ffff8881d7559190 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: ffffc900004752e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1700: #0: ffff8881d9131190 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: ffffc900004612e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 2 locks held by getty/1701: #0: ffff8881d913cd10 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: ffffc9000043d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 5 locks held by kworker/0:5/3240: #0: ffff8881d978dca8 ((wq_completion)usb_hub_wq){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: ffff8881d978dca8 ((wq_completion)usb_hub_wq){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8881d978dca8 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff8881d978dca8 ((wq_completion)usb_hub_wq){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff8881d978dca8 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data kernel/workqueue.c:620 [inline] #0: ffff8881d978dca8 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline] #0: ffff8881d978dca8 ((wq_completion)usb_hub_wq){+.+.}, at: process_one_work+0x827/0x1530 kernel/workqueue.c:2240 #1: ffff8881c1dc7dd0 ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x85b/0x1530 kernel/workqueue.c:2244 #2: ffff8881d5c93500 (&dev->mutex){....}, at: device_lock include/linux/device.h:1462 [inline] #2: ffff8881d5c93500 (&dev->mutex){....}, at: hub_event+0x17c/0x3640 drivers/usb/core/hub.c:5387 #3: ffff8881d755df80 (&dev->mutex){....}, at: device_lock include/linux/device.h:1462 [inline] #3: ffff8881d755df80 (&dev->mutex){....}, at: __device_attach+0x7b/0x360 drivers/base/dd.c:871 #4: ffff8881d15f2c10 (&dev->mutex){....}, at: device_lock include/linux/device.h:1462 [inline] #4: ffff8881d15f2c10 (&dev->mutex){....}, at: __device_attach+0x7b/0x360 drivers/base/dd.c:871 1 lock held by syz-executor.1/4653: #0: ffff8881d5c93500 (&dev->mutex){....}, at: device_lock include/linux/device.h:1462 [inline] #0: ffff8881d5c93500 (&dev->mutex){....}, at: usbdev_open+0x19d/0x840 drivers/usb/core/devio.c:1007 1 lock held by syz-executor.0/4661: #0: ffff8881d5c93500 (&dev->mutex){....}, at: device_lock include/linux/device.h:1462 [inline] #0: ffff8881d5c93500 (&dev->mutex){....}, at: usbdev_open+0x19d/0x840 drivers/usb/core/devio.c:1007 1 lock held by syz-executor.0/4663: #0: ffff8881d5c93500 (&dev->mutex){....}, at: device_lock include/linux/device.h:1462 [inline] #0: ffff8881d5c93500 (&dev->mutex){....}, at: usbdev_open+0x19d/0x840 drivers/usb/core/devio.c:1007 1 lock held by syz-executor.3/4667: #0: ffff8881d5c93500 (&dev->mutex){....}, at: device_lock include/linux/device.h:1462 [inline] #0: ffff8881d5c93500 (&dev->mutex){....}, at: usbdev_open+0x19d/0x840 drivers/usb/core/devio.c:1007 1 lock held by syz-executor.3/4688: #0: ffff8881d5c93500 (&dev->mutex){....}, at: device_lock include/linux/device.h:1462 [inline] #0: ffff8881d5c93500 (&dev->mutex){....}, at: usbdev_open+0x19d/0x840 drivers/usb/core/devio.c:1007 1 lock held by syz-executor.4/4676: #0: ffff8881d5c93500 (&dev->mutex){....}, at: device_lock include/linux/device.h:1462 [inline] #0: ffff8881d5c93500 (&dev->mutex){....}, at: usbdev_open+0x19d/0x840 drivers/usb/core/devio.c:1007 1 lock held by syz-executor.4/4677: #0: ffff8881d5c93500 (&dev->mutex){....}, at: device_lock include/linux/device.h:1462 [inline] #0: ffff8881d5c93500 (&dev->mutex){....}, at: usbdev_open+0x19d/0x840 drivers/usb/core/devio.c:1007 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 5.3.0+ #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 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] NMI backtrace for cpu 0 skipped: idling at default_idle+0x28/0x2e0 arch/x86/kernel/process.c:580