INFO: task hung in usb_remote_wakeup

Status: upstream: reported syz repro on 2026/08/04 09:34
Reported-by: syzbot+43a3052e3b0dfdf5cdf5@syzkaller.appspotmail.com
First crash: 4d11h, last: 4d11h
▶ ▼ Similar bugs (9)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: task hung in usb_remote_wakeup 1 1 2069d 2069d 0/1 auto-closed as invalid on 2021/04/07 18:31
upstream INFO: task hung in usb_remote_wakeup (2) usb 1 syz inconclusive done 9 1814d 2013d 20/29 fixed on 2021/11/10 00:50
upstream INFO: task hung in usb_remote_wakeup (3) usb 1 1 1627d 1627d 0/29 auto-closed as invalid on 2022/05/24 13:32
upstream INFO: task hung in usb_remote_wakeup (5) usb 1 1 1186d 1186d 0/29 auto-obsoleted due to no activity on 2023/08/08 04:40
upstream INFO: task hung in usb_remote_wakeup usb 1 7 2478d 2664d 0/29 auto-closed as invalid on 2020/01/24 14:16
upstream INFO: task hung in usb_remote_wakeup (7) usb 1 2 291d 359d 0/29 auto-obsoleted due to no activity on 2026/01/19 09:40
upstream INFO: task hung in usb_remote_wakeup (4) usb 1 2 1367d 1417d 0/29 auto-obsoleted due to no activity on 2023/02/10 23:06
upstream INFO: task hung in usb_remote_wakeup (6) usb 1 1 674d 674d 0/29 auto-obsoleted due to no activity on 2025/01/01 01:43
linux-4.14 INFO: task hung in usb_remote_wakeup 1 1 2129d 2129d 0/1 auto-closed as invalid on 2021/02/06 13:01

Sample crash report:
INFO: task kworker/0:7:4492 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:7     state:D stack:0     pid:4492  ppid:2      flags:0x00000008
Workqueue: pm hcd_resume_work
Call trace:
 __switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0xdb4/0x1a6c kernel/sched/core.c:6563
 schedule+0xc4/0x170 kernel/sched/core.c:6639
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6698
 __mutex_lock_common+0xb20/0x1f3c kernel/locking/mutex.c:679
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
 device_lock include/linux/device.h:885 [inline]
 usb_remote_wakeup+0x24/0xf8 drivers/usb/core/hub.c:3834
 hcd_resume_work+0x40/0x50 drivers/usb/core/hcd.c:2401
 process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292
 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439
 kthread+0x254/0x2e0 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
INFO: task syz.0.48:4691 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.48        state:D stack:0     pid:4691  ppid:4484   flags:0x00000001
Call trace:
 __switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0xdb4/0x1a6c kernel/sched/core.c:6563
 schedule+0xc4/0x170 kernel/sched/core.c:6639
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6698
 __mutex_lock_common+0xb20/0x1f3c kernel/locking/mutex.c:679
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
 device_lock include/linux/device.h:885 [inline]
 usbdev_release+0x78/0x6d4 drivers/usb/core/devio.c:1097
 __fput+0x1b4/0x7b0 fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x1f4/0x280 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 do_notify_resume+0x20f8/0x2c84 arch/arm64/kernel/signal.c:1151
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
INFO: task syz.4.51:4697 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.51        state:D stack:0     pid:4697  ppid:4495   flags:0x00000001
Call trace:
 __switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0xdb4/0x1a6c kernel/sched/core.c:6563
 schedule+0xc4/0x170 kernel/sched/core.c:6639
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6698
 __mutex_lock_common+0xb20/0x1f3c kernel/locking/mutex.c:679
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
 device_lock include/linux/device.h:885 [inline]
 usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
 chrdev_open+0x3d0/0x51c fs/char_dev.c:414
 do_dentry_open+0x738/0xf8c fs/open.c:882
 vfs_open+0x7c/0x90 fs/open.c:1015
 do_open fs/namei.c:3634 [inline]
 path_openat+0x1fc0/0x27a0 fs/namei.c:3791
 do_filp_open+0x198/0x38c fs/namei.c:3818
 do_sys_openat2+0x134/0x3fc fs/open.c:1320
 do_sys_open fs/open.c:1336 [inline]
 __do_sys_openat fs/open.c:1352 [inline]
 __se_sys_openat fs/open.c:1347 [inline]
 __arm64_sys_openat+0x11c/0x150 fs/open.c:1347
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
INFO: task syz.2.49:4698 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.49        state:D stack:0     pid:4698  ppid:4489   flags:0x00000001
Call trace:
 __switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0xdb4/0x1a6c kernel/sched/core.c:6563
 schedule+0xc4/0x170 kernel/sched/core.c:6639
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6698
 __mutex_lock_common+0xb20/0x1f3c kernel/locking/mutex.c:679
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
 device_lock include/linux/device.h:885 [inline]
 usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
 chrdev_open+0x3d0/0x51c fs/char_dev.c:414
 do_dentry_open+0x738/0xf8c fs/open.c:882
 vfs_open+0x7c/0x90 fs/open.c:1015
 do_open fs/namei.c:3634 [inline]
 path_openat+0x1fc0/0x27a0 fs/namei.c:3791
 do_filp_open+0x198/0x38c fs/namei.c:3818
 do_sys_openat2+0x134/0x3fc fs/open.c:1320
 do_sys_open fs/open.c:1336 [inline]
 __do_sys_openat fs/open.c:1352 [inline]
 __se_sys_openat fs/open.c:1347 [inline]
 __arm64_sys_openat+0x11c/0x150 fs/open.c:1347
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
INFO: task syz.1.50:4702 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.50        state:D stack:0     pid:4702  ppid:4482   flags:0x00000001
Call trace:
 __switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0xdb4/0x1a6c kernel/sched/core.c:6563
 schedule+0xc4/0x170 kernel/sched/core.c:6639
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6698
 __mutex_lock_common+0xb20/0x1f3c kernel/locking/mutex.c:679
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
 device_lock include/linux/device.h:885 [inline]
 usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
 chrdev_open+0x3d0/0x51c fs/char_dev.c:414
 do_dentry_open+0x738/0xf8c fs/open.c:882
 vfs_open+0x7c/0x90 fs/open.c:1015
 do_open fs/namei.c:3634 [inline]
 path_openat+0x1fc0/0x27a0 fs/namei.c:3791
 do_filp_open+0x198/0x38c fs/namei.c:3818
 do_sys_openat2+0x134/0x3fc fs/open.c:1320
 do_sys_open fs/open.c:1336 [inline]
 __do_sys_openat fs/open.c:1352 [inline]
 __se_sys_openat fs/open.c:1347 [inline]
 __arm64_sys_openat+0x11c/0x150 fs/open.c:1347
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
INFO: task syz.3.52:4709 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.52        state:D stack:0     pid:4709  ppid:4488   flags:0x00000001
Call trace:
 __switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0xdb4/0x1a6c kernel/sched/core.c:6563
 schedule+0xc4/0x170 kernel/sched/core.c:6639
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6698
 __mutex_lock_common+0xb20/0x1f3c kernel/locking/mutex.c:679
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
 device_lock include/linux/device.h:885 [inline]
 usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
 chrdev_open+0x3d0/0x51c fs/char_dev.c:414
 do_dentry_open+0x738/0xf8c fs/open.c:882
 vfs_open+0x7c/0x90 fs/open.c:1015
 do_open fs/namei.c:3634 [inline]
 path_openat+0x1fc0/0x27a0 fs/namei.c:3791
 do_filp_open+0x198/0x38c fs/namei.c:3818
 do_sys_openat2+0x134/0x3fc fs/open.c:1320
 do_sys_open fs/open.c:1336 [inline]
 __do_sys_openat fs/open.c:1352 [inline]
 __se_sys_openat fs/open.c:1347 [inline]
 __arm64_sys_openat+0x11c/0x150 fs/open.c:1347
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Showing all locks held in the system:
3 locks held by kworker/u4:0/9:
1 lock held by rcu_tasks_kthre/12:
 #0: ffff800015557db0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xc48 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
 #0: ffff8000155585d0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xc48 kernel/rcu/tasks.h:517
5 locks held by kworker/0:1/14:
 #0: ffff0000c4a58138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1
 #1: ffff80001cb87c40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267
 #2: ffff0000d265e190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #2: ffff0000d265e190 (&dev->mutex){....}-{3:3}, at: hub_event+0x134/0x3e74 drivers/usb/core/hub.c:5845
 #3: ffff0000d2701518 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3200 [inline]
 #3: ffff0000d2701518 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5413 [inline]
 #3: ffff0000d2701518 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5657 [inline]
 #3: ffff0000d2701518 (&port_dev->status_lock){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5817 [inline]
 #3: ffff0000d2701518 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_event+0x19fc/0x3e74 drivers/usb/core/hub.c:5899
 #4: ffff0000d22ed468 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5414 [inline]
 #4: ffff0000d22ed468 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5657 [inline]
 #4: ffff0000d22ed468 (hcd->address0_mutex){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5817 [inline]
 #4: ffff0000d22ed468 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_event+0x1a2c/0x3e74 drivers/usb/core/hub.c:5899
1 lock held by khungtaskd/28:
 #0: ffff800015557440 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:349
5 locks held by kworker/0:2/1516:
 #0: ffff0000c4a58138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1
 #1: ffff8000251e7c40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267
 #2: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #2: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: hub_event+0x134/0x3e74 drivers/usb/core/hub.c:5845
 #3: ffff0000d25b9518 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3200 [inline]
 #3: ffff0000d25b9518 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5413 [inline]
 #3: ffff0000d25b9518 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5657 [inline]
 #3: ffff0000d25b9518 (&port_dev->status_lock){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5817 [inline]
 #3: ffff0000d25b9518 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_event+0x19fc/0x3e74 drivers/usb/core/hub.c:5899
 #4: ffff0000d22d6c68 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5414 [inline]
 #4: ffff0000d22d6c68 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5657 [inline]
 #4: ffff0000d22d6c68 (hcd->address0_mutex){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5817 [inline]
 #4: ffff0000d22d6c68 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_event+0x1a2c/0x3e74 drivers/usb/core/hub.c:5899
2 locks held by getty/4082:
 #0: ffff0000d6b21098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff800020b2b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2e8/0xfa8 drivers/tty/n_tty.c:2198
3 locks held by kworker/0:5/4404:
 #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1
 #1: ffff8000210f7c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267
 #2: ffff0000ef930240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x1d8/0x2708 drivers/net/netdevsim/fib.c:1491
3 locks held by kworker/0:7/4492:
 #0: ffff0000c08f2138 ((wq_completion)pm){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1
 #1: ffff800021107c40 ((work_completion)(&hcd->wakeup_work)){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267
 #2: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #2: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usb_remote_wakeup+0x24/0xf8 drivers/usb/core/hub.c:3834
1 lock held by syz.0.48/4691:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_release+0x78/0x6d4 drivers/usb/core/devio.c:1097
1 lock held by syz.4.51/4697:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.2.49/4698:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.1.50/4702:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.3.52/4709:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.6.54/4831:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.5.53/4835:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.8.56/4841:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.9.57/4845:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.7.55/4849:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.3.61/4904:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.1.59/4913:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.2.60/4935:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.0.58/4940:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.4.62/4941:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.5.63/4987:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.6.64/5033:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.7.65/5067:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.8.66/5071:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.9.67/5074:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.3.68/5092:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.1.69/5108:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.0.70/5161:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.2.71/5165:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.4.72/5169:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.5.73/5200:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.6.74/5226:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.7.75/5281:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.8.76/5301:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.9.77/5305:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.3.78/5324:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.1.79/5340:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.2.81/5377:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.0.80/5395:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.4.82/5399:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.5.83/5425:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.6.84/5451:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.7.85/5503:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.8.86/5517:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.9.87/5534:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.3.88/5547:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
1 lock held by syz.1.89/5563:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052
7 locks held by syz-executor/5587:
 #0: ffff0000d8e9a460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
 #1: ffff00010c8b5c88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1b8/0x4b4 fs/kernfs/file.c:343
 #2: ffff0000cadd4a00 (kn->active#56){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:80 [inline]
 #2: ffff0000cadd4a00 (kn->active#56){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1f8/0x4b4 fs/kernfs/file.c:344
 #3: ffff800016db0568 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xdc/0x330 drivers/net/netdevsim/bus.c:209
 #4: ffff0000f2a1a0e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #4: ffff0000f2a1a0e8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1099 [inline]
 #4: ffff0000f2a1a0e8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0x9c/0x6e4 drivers/base/dd.c:1302
 #5: ffff0000f2a182f8 (&devlink->lock_key#35){+.+.}-{3:3}, at: devl_lock+0x24/0x34 net/devlink/leftover.c:275
 #6: ffff80001555cfc0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x58/0x5b8 kernel/rcu/tree.c:4023
1 lock held by syz.2.90/5590:
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:885 [inline]
 #0: ffff0001ffb1c190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x138/0x69c drivers/usb/core/devio.c:1052

=============================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/04 09:34 linux-6.1.y fb28aa725e05 9451e17e .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 INFO: task hung in usb_remote_wakeup
* Struck through repros no longer work on HEAD.