kern/51151: athn panic on attach

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         51151
>Category:       kern
>Synopsis:       athn panic on attach
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed May 18 15:40:00 +0000 2016
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current, source date 2016.05.16.09.53.59
>Organization:

>Environment:
System: NetBSD
Architecture: x86_64
Machine: amd64
>Description:

When I plug in a Comfast CF-WU871N USB Wireless Adapter, the
athn driver immediately panics:

athn0 at uhub13 port 2
uvm_fault(0xffffffff812f72e0, 0x0, 2) -> e
fatal page fault in supervisor mode
trap type 6 code 2 rip ffffffff80397220 cs 8 rflags 10286 cr2 0 ilevel 4 rsp fffffe8045fa1b00
curlwp 0xfffffe8045e8ca60 pid 0.78 lowest kstack 0xfffffe8045f9e2c0
panic: trap
cpu0: Begin traceback...
vpanic() at netbsd:vpanic+0x140
snprintf() at netbsd:snprintf
trap() at netbsd:trap+0xc4b
--- trap (number 6) ---
athn_usb_htc_msg.part.8() at netbsd:athn_usb_htc_msg.part.8+0x1c
athn_usb_htc_connect_svc() at netbsd:athn_usb_htc_connect_svc+0xbc
athn_usb_attachhook() at netbsd:athn_usb_attachhook+0x298
athn_usb_attach() at netbsd:athn_usb_attach+0x395
config_attach_loc() at netbsd:config_attach_loc+0x17a
config_found_sm_loc() at netbsd:config_found_sm_loc+0x48
usbd_attachwholedevice() at netbsd:usbd_attachwholedevice+0x8e
usbd_probe_and_attach() at netbsd:usbd_probe_and_attach+0x24
usbd_new_device() at netbsd:usbd_new_device+0x395
uhub_explore() at netbsd:uhub_explore+0x2f4
usb_discover.isra.2() at netbsd:usb_discover.isra.2+0x4e
usb_event_thread() at netbsd:usb_event_thread+0x7c
cpu0: End traceback...

>How-To-Repeat:

See above.

>Fix: