Re: port-amd64/56171: Removing USB keyboard always causes panic

[Andrius V <vezhlys%gmail.com@localhost>]

After I bit more testing, it's actually combination of keyboard and
wireless Logitech M560 receiver connected to it causing the panic.
Thus, it explains why I didn't notice it before, I started using  this
mouse just recently. If receiver is not connected or connected to
different USB port (not keyboard usb hub), NetBSD does not crash.
Otherwise kernel panics in all cases. I tested other few USB devices
connected to the keyboard (trackball, USB network card), but they
don't seem to trigger panic. So, it's only caused by this specific
combination.

On Sat, May 15, 2021 at 1:00 AM <vezhlys%gmail.com@localhost> wrote:
>
> >Number:         56171
> >Category:       port-amd64
> >Synopsis:       Removing USB keyboard always causes panic
> >Confidential:   no
> >Severity:       serious
> >Priority:       high
> >Responsible:    port-amd64-maintainer
> >State:          open
> >Class:          sw-bug
> >Submitter-Id:   net
> >Arrival-Date:   Fri May 14 22:00:00 +0000 2021
> >Originator:     Andrius V
> >Release:        NetBSD 9.2
> >Organization:
> >Environment:
> NetBSD  9.2 NetBSD 9.2 (GENERIC) #0: Wed May 12 22:13:25 EEST 2021  andriusv@:/home/andriusv/netbsd-src/sys/arch/amd64/compile/GENERIC amd64
> >Description:
> After building NetBSD 9.2 code, removing my Fnatic Gear Rush Pro keyboard (it also has USB hub) from USB port always causes NetBSD to crash. I believe it is some kind of regression since I don't remember that happening before, but I may try to test older kernels (and current) later if relevant. The system itself is Ryzen 5 3600 CPU on x370 chipset based computer. Mate desktop environment is used. Error log (typed manually from image, thus may contain typos):
>
> fatal page fault in supervisor mode
> trap type 6 code 0x2 rip 0xffffffff8066074c cd 0x8 rflags 0x10282 cr2 0 ilevel 0 rsp 0xffffdb8259a66e10
> curlwp 0xfffffe99290d4520 pid 0.93 lowest kstack 0xffffdb8259a642c0
> panic: trap
> cpu4: Begin traceback...
> vpanic() at netbsd:vpanic+0x160
> snprintf() at netbsd:snprintf
> startlwp() at netbsd:startlwp
> alltraps() at netbsd:alltraps+0xbb
> xhci_device_ctrl_start() at netbsd:xhci_netbsd_ctrl_start+0x282
> usbd_transfer() at netbsd:usbd_transfer+0x95
> usbd_do_request_len() at netbsd:usbd_do_request_len+0x99
> usbd_do_request() at netbsd:usbd_do_request+0x24
> usbd_clear_endpoint_stall_task() at netbsd:usbd_clear_endpoint_stall_task+0x6f
> usb_task_thread() at netbsd:usb_task_thread+0x94
> cpu4: End traceback...
>
> Regards,
> Andrius V
> >How-To-Repeat:
>
> >Fix:
>