Hello, syzbot found the following issue on: HEAD commit: f2906aa86338 Linux 5.19-rc1 git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing console output: https://syzkaller.appspot.com/x/log.txt?x=1042a03bf00000 kernel config: https://syzkaller.appspot.com/x/.config?x=3bafeb86189666d4 dashboard link: https://syzkaller.appspot.com/bug?extid=695f4009c37860232f35 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+695f4009c37860232f35@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task swapper/0:1 blocked for more than 143 seconds. Not tainted 5.19.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:swapper/0 state:D stack:23984 pid: 1 ppid: 0 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5116 [inline] __schedule+0x93c/0x25e0 kernel/sched/core.c:6428 schedule+0xd2/0x1f0 kernel/sched/core.c:6500 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6559 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0xa70/0x1350 kernel/locking/mutex.c:747 add_early_randomness+0x1a/0x170 drivers/char/hw_random/core.c:69 hwrng_register+0x399/0x510 drivers/char/hw_random/core.c:599 virtrng_scan+0x37/0x90 drivers/char/hw_random/virtio-rng.c:205 virtio_dev_probe+0x639/0x910 drivers/virtio/virtio.c:313 call_driver_probe drivers/base/dd.c:555 [inline] really_probe+0x23e/0xb90 drivers/base/dd.c:634 __driver_probe_device+0x338/0x4d0 drivers/base/dd.c:764 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:794 __driver_attach+0x22d/0x550 drivers/base/dd.c:1163 bus_for_each_dev+0x147/0x1d0 drivers/base/bus.c:301 bus_add_driver+0x422/0x640 drivers/base/bus.c:618 driver_register+0x220/0x3a0 drivers/base/driver.c:240 do_one_initcall+0x103/0x650 init/main.c:1295 do_initcall_level init/main.c:1368 [inline] do_initcalls init/main.c:1384 [inline] do_basic_setup init/main.c:1403 [inline] kernel_init_freeable+0x6ac/0x735 init/main.c:1610 kernel_init+0x1a/0x1d0 init/main.c:1499 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 </TASK> Showing all locks held in the system: 2 locks held by swapper/0/1: #0: ffff88810cb9e170 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:835 [inline] #0: ffff88810cb9e170 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1054 [inline] #0: ffff88810cb9e170 (&dev->mutex){....}-{3:3}, at: __driver_attach+0x222/0x550 drivers/base/dd.c:1162 #1: ffffffff87edbbe8 (reading_mutex){+.+.}-{3:3}, at: add_early_randomness+0x1a/0x170 drivers/char/hw_random/core.c:69 2 locks held by pr/ttyS0/14: 1 lock held by khungtaskd/27: #0: ffffffff87a94840 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6491 1 lock held by hwrng/150: #0: ffffffff87edbbe8 (reading_mutex){+.+.}-{3:3}, at: hwrng_fillfn+0x141/0x370 drivers/char/hw_random/core.c:503 ============================================= --- This report 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 issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
