xsrc/51656: radeondrmkms X server crash with supertuxkart

[dholland%netbsd.org@localhost]

>Number:         51656
>Category:       xsrc
>Synopsis:       radeondrmkms X server crash with supertuxkart
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    xsrc-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Nov 26 08:25:00 +0000 2016
>Originator:     David A. Holland
>Release:        NetBSD 7.99.42 (20161125)
>Organization:
>Environment:
System: NetBSD valkyrie 7.99.42 NetBSD 7.99.42 (VALKYRIE) #20: Fri Nov 25 18:33:19 EST 2016  dholland@valkyrie:/usr/src/sys/arch/amd64/compile/VALKYRIE amd64
Architecture: x86_64
Machine: amd64
>Description:

With the latest radeondrmkms and native X, and my particular hardware,
the following failures occur:
   - start supertuxkart and exit immediately -> the X server dumps core
   - start supertuxkart and start a race -> the X server wedges solid

more data to follow as time permits.

This does not happen on another machine I have with the exact same
radeon but an older kernel and xsrc (7.99.30 from June) ... and
fewer/slower CPUs. I am going to be updating it next week and can test
supertuxkart there too.

>How-To-Repeat:
>Fix:

dunno.