On Tue, Oct 6, 2020 at 10:56 AM Oliver Neukum <oneukum@xxxxxxx> wrote: > > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=152bb760500000 > > final oops: https://syzkaller.appspot.com/x/report.txt?x=172bb760500000 > > console output: https://syzkaller.appspot.com/x/log.txt?x=132bb760500000 > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+74d6ef051d3d2eacf428@xxxxxxxxxxxxxxxxxxxxxxxxx > > Fixes: 6dcf45e51497 ("sh_eth: use correct name for ECMR_MPDE bit") > > > > INFO: task kworker/0:0:5 blocked for more than 143 seconds. > > Not tainted 5.9.0-rc7-syzkaller #0 > > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > > task:kworker/0:0 state:D stack:27664 pid: 5 ppid: 2 flags:0x00004000 > > Workqueue: usb_hub_wq hub_event > > Call Trace: > > context_switch kernel/sched/core.c:3778 [inline] > > __schedule+0xec9/0x2280 kernel/sched/core.c:4527 > > schedule+0xd0/0x2a0 kernel/sched/core.c:4602 > > By this time urb_dequeue() has been killed and has returned. > > > usb_kill_urb.part.0+0x197/0x220 drivers/usb/core/urb.c:696 > > usb_kill_urb+0x7c/0x90 drivers/usb/core/urb.c:691 > > usb_start_wait_urb+0x24a/0x2b0 drivers/usb/core/message.c:64 > > usb_internal_control_msg drivers/usb/core/message.c:102 [inline] > > usb_control_msg+0x31c/0x4a0 drivers/usb/core/message.c:153 > > hub_port_init+0x11ae/0x2d80 drivers/usb/core/hub.c:4689 > > hub_port_connect drivers/usb/core/hub.c:5140 [inline] > > hub_port_connect_change drivers/usb/core/hub.c:5348 [inline] > > port_event drivers/usb/core/hub.c:5494 [inline] > > > > This looks like it should. > > Which HC driver are you using for these tests? Hi Oliver, This is the USB/IP one, based on what I see in the reproducer. Thanks! > It looks like > the HCD is not acting on urb_dequeue(), rather than a locking > issue.
