syzbot


INFO: task hung in usbdev_open (2)

Status: auto-obsoleted due to no activity on 2024/03/20 05:29
Reported-by: syzbot+f898ddae7ec39f767bf8@syzkaller.appspotmail.com
First crash: 133d, last: 133d
Similar bugs (11)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: task hung in usbdev_open (3) 1 484d 484d 0/1 upstream: reported on 2022/12/25 16:08
upstream INFO: task hung in usbdev_open (2) usb C error 625 8h20m 1210d 0/26 upstream: reported C repro on 2020/12/29 11:48
linux-6.1 INFO: task hung in usbdev_open origin:lts-only C done 3 330d 387d 3/3 fixed on 2023/06/28 17:15
linux-4.19 INFO: task hung in usbdev_open (2) 2 883d 890d 0/1 auto-closed as invalid on 2022/03/21 09:54
linux-5.15 INFO: task hung in usbdev_open origin:lts-only C error 17 12d 387d 0/3 upstream: reported C repro on 2023/04/01 11:58
linux-4.19 INFO: task hung in usbdev_open 6 1183d 1269d 0/1 auto-closed as invalid on 2021/05/25 14:21
linux-4.14 INFO: task hung in usbdev_open 7 1142d 1281d 0/1 auto-closed as invalid on 2021/07/05 05:59
upstream INFO: task hung in usbdev_open usb 2 1671d 1671d 0/26 auto-closed as invalid on 2019/12/23 20:14
linux-6.1 INFO: task hung in usbdev_open (3) 1 22d 22d 0/3 upstream: reported on 2024/03/31 03:03
linux-4.14 INFO: task hung in usbdev_open (2) 1 434d 434d 0/1 upstream: reported on 2023/02/13 07:50
upstream INFO: task can't die in usbdev_open usb 4 1175d 1288d 0/26 auto-closed as invalid on 2021/04/02 18:49

Sample crash report:
INFO: task syz-executor.2:8100 blocked for more than 143 seconds.
      Not tainted 6.1.66-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2  state:D stack:0     pid:8100  ppid:4264   flags:0x00000005
Call trace:
 __switch_to+0x320/0x754 arch/arm64/kernel/process.c:553
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0xee4/0x1c98 kernel/sched/core.c:6558
 schedule+0xc4/0x170 kernel/sched/core.c:6634
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6693
 __mutex_lock_common+0xbd8/0x21a0 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:836 [inline]
 usbdev_open+0x13c/0x6c0 drivers/usb/core/devio.c:1052
 chrdev_open+0x3e8/0x4fc fs/char_dev.c:414
 do_dentry_open+0x734/0xfa0 fs/open.c:882
 vfs_open+0x7c/0x90 fs/open.c:1013
 do_open fs/namei.c:3558 [inline]
 path_openat+0x1e14/0x2548 fs/namei.c:3715
 do_filp_open+0x1bc/0x3cc fs/namei.c:3742
 do_sys_openat2+0x128/0x3d8 fs/open.c:1318
 do_sys_open fs/open.c:1334 [inline]
 __do_sys_openat fs/open.c:1350 [inline]
 __se_sys_openat fs/open.c:1345 [inline]
 __arm64_sys_openat+0x1f0/0x240 fs/open.c:1345
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x168 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:
1 lock held by rcu_tasks_kthre/12:
 #0: ffff8000159f4e70 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:516
1 lock held by rcu_tasks_trace/13:
 #0: ffff8000159f5670 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:516
6 locks held by kworker/1:1/24:
 #0: ffff0000c46a4d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 kernel/workqueue.c:2265
 #1: ffff800019ef7c20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 kernel/workqueue.c:2267
 #2: ffff0000d165b190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:836 [inline]
 #2: ffff0000d165b190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1ac/0x4360 drivers/usb/core/hub.c:5758
 #3: ffff0000dadaf190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:836 [inline]
 #3: ffff0000dadaf190 (&dev->mutex){....}-{3:3}, at: __device_attach+0x90/0x480 drivers/base/dd.c:990
 #4: ffff0000dcdf1118 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:836 [inline]
 #4: ffff0000dcdf1118 (&dev->mutex){....}-{3:3}, at: __device_attach+0x90/0x480 drivers/base/dd.c:990
 #5: ffff8000158a4630 (umhelper_sem){++++}-{3:3}, at: usermodehelper_read_trylock+0x12c/0x2d0 kernel/umh.c:218
1 lock held by khungtaskd/28:
 #0: ffff8000159f4ca0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:305
2 locks held by getty/3981:
 #0: ffff0000d6106098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff80001bc902f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1214 drivers/tty/n_tty.c:2188
2 locks held by kworker/u4:14/6651:
1 lock held by syz-executor.2/8100:
 #0: ffff0000d165b190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:836 [inline]
 #0: ffff0000d165b190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x13c/0x6c0 drivers/usb/core/devio.c:1052
1 lock held by syz-executor.2/8213:
 #0: ffff0000d165b190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:836 [inline]
 #0: ffff0000d165b190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x13c/0x6c0 drivers/usb/core/devio.c:1052
1 lock held by syz-executor.2/8276:
 #0: ffff0000d165b190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:836 [inline]
 #0: ffff0000d165b190 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x13c/0x6c0 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
2023/12/11 05:28 linux-6.1.y 6c6a6c7e211c 28b24332 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 INFO: task hung in usbdev_open
* Struck through repros no longer work on HEAD.