kern/49728: crash in uhid

[snj%blef.org@localhost]

>Number:         49728
>Category:       kern
>Synopsis:       uhid boom
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Mar 07 08:10:00 +0000 2015
>Originator:     Soren Jacobsen
>Release:        NetBSD 7.0_BETA
>Organization:
>Environment:
NetBSD nimbus.blef.org 7.0_BETA NetBSD 7.0_BETA (NIMBUS) #0: Fri Mar  6 11:56:05 PST 2015  snj%nimbus.blef.org@localhost:/usr/tmpobj/sys/arch/amd64/compile/NIMBUS amd64
Architecture: x86_64
Machine: amd64
>Description:
uvm_fault(0xfffffe811e369e68, 0x0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff808fcef4 cs 8 rflags 10206 cr2 28 ilevel 6 rsp fffffe8120c5abf8
curlwp 0xfffffe823bbdfb60 pid 13305.1 lowest kstack 0xfffffe8120c582c0
panic: trap
cpu4: Begin traceback...
vpanic() at netbsd:vpanic+0x13c
snprintf() at netbsd:snprintf
startlwp() at netbsd:startlwp
alltraps() at netbsd:alltraps+0x96
uhidread() at netbsd:uhidread+0x1dd
spec_read() at netbsd:spec_read+0x5e
VOP_READ() at netbsd:VOP_READ+0x37
vn_read() at netbsd:vn_read+0x94
dofileread() at netbsd:dofileread+0x90
sys_read() at netbsd:sys_read+0x5f
syscall() at netbsd:syscall+0x9a
--- syscall (number 3) ---
7f7ff443c1fa:
cpu4: End traceback...
>How-To-Repeat:
Plug in Sony DualShock 3, spend an hour playing Symphony of the
Night under retroarch, wait for the boom, grumble about losing progress,
wait for dump to finish, go back to slaying the undead.
>Fix:
Yes, please!