Am Dienstag, den 06.10.2020, 01:19 -0700 schrieb syzbot: Hi, > HEAD commit: d3d45f82 Merge tag 'pinctrl-v5.9-2' of git://git.kernel.or.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=14c3b3db900000 > kernel config: https://syzkaller.appspot.com/x/.config?x=89ab6a0c48f30b49 > dashboard link: https://syzkaller.appspot.com/bug?extid=74d6ef051d3d2eacf428 > compiler: gcc (GCC) 10.1.0-syz 20200507 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=153bf5bd900000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=124c92af900000 > > The issue was bisected to: > > commit 6dcf45e514974a1ff10755015b5e06746a033e5f > Author: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx> > Date: Mon Jan 9 15:34:04 2017 +0000 > > sh_eth: use correct name for ECMR_MPDE bit I am afraid this has bisected a race condition into neverland. > 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? It looks like the HCD is not acting on urb_dequeue(), rather than a locking issue. Regards Oliver
