port-i386/46716: Panic after starting Xorg with intel i915 driver

[swiftgriggs%gmail.com@localhost]

>Number:         46716
>Category:       port-i386
>Synopsis:       Kernel panic after starting X11R7 using intel i915 + drm
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jul 17 17:05:00 +0000 2012
>Originator:     swiftgriggs%gmail.com@localhost
>Release:        NetBSD 6.0_BETA2
>Organization:

>Environment:
System: NetBSD daemon.corp.trizetto.com 6.0_BETA2 NetBSD 6.0_BETA2 (GENERIC) 
i386
Architecture: i386
Machine: i386
>Description:
After leaving a core2duo box with integrated graphics running and compiling 
pkgsrc packages all night, I attempted to start X11. I had already started it 
once when the machine first 
booted and it worked fine. Then I came back about 12 hours later and restarted 
X11. The framebuffer output was corrupted with blinking boxes colors, followed 
by a reboot about 10 seconds 
later (I assume the delay was for the crash dump to be written). I have core 
dumps and what not to aid in the diagnosis.
  
>How-To-Repeat:
Restart X11 multiple times on a core2 box with i915 graphics. Eventually, the 
kernel will panic and dump core. 

>Fix:
The only workaround I'm aware of is to reboot and start X11 immediately after 
the system boots. Then don't cycle X11 afterwards.