kern/122615: occasional crash/boot while running Xorg

[bob frazier]

>Number:         122615
>Category:       kern
>Synopsis:       occasional crash/boot while running Xorg
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Apr 10 05:20:00 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator:     bob frazier
>Release:        FreeBSD 7.0-STABLE
>Organization:
SFT inc.
>Environment:
FreeBSD hack.SFT.local 7.0-STABLE FreeBSD 7.0-STABLE #0: Tue Apr  1 01:11:09 PDT 2008     root at hack.SFT.local:/usr/obj/usr/src/sys/GENERIC  i386
>Description:
While Xorg is running and a reasonably large number of resources are in use, the system will occasionally reboot itself.  Sometimes Xorg crashes on its own a signal 11, but often enough the entire system will crash (panic) and reboot.  I have saved the most recent crash dump files and will upload them here if possible (otherwise I'll send by e-mail if you ask me).

pciconf output
hostb0 at pci0:0:0:0:	class=0x060000 card=0x1b291019 chip=0x07411039 rev=0x03 hdr=0x00
pcib1 at pci0:0:1:0:	class=0x060400 card=0x00000000 chip=0x00031039 rev=0x00 hdr=0x01
isab0 at pci0:0:2:0:	class=0x060100 card=0x00000000 chip=0x09641039 rev=0x36 hdr=0x00
atapci0 at pci0:0:2:5:	class=0x01018a card=0x1b291019 chip=0x55131039 rev=0x01 hdr=0x00
pcm0 at pci0:0:2:7:	class=0x040100 card=0x1b291019 chip=0x70121039 rev=0xa0 hdr=0x00
ohci0 at pci0:0:3:0:	class=0x0c0310 card=0x1b291019 chip=0x70011039 rev=0x0f hdr=0x00
ohci1 at pci0:0:3:1:	class=0x0c0310 card=0x1b291019 chip=0x70011039 rev=0x0f hdr=0x00
ohci2 at pci0:0:3:2:	class=0x0c0310 card=0x1b291019 chip=0x70011039 rev=0x0f hdr=0x00
ehci0 at pci0:0:3:3:	class=0x0c0320 card=0x1b291019 chip=0x70021039 rev=0x00 hdr=0x00
re0 at pci0:0:9:0:	class=0x020000 card=0x816910ec chip=0x816910ec rev=0x10 hdr=0x00
ath0 at pci0:0:10:0:	class=0x020000 card=0x3ab91948 chip=0x0013168c rev=0x01 hdr=0x00
atapci1 at pci0:0:11:0:	class=0x018000 card=0x31121095 chip=0x31121095 rev=0x02 hdr=0x00
vgapci0 at pci0:1:0:0:	class=0x030000 card=0x1b291019 chip=0x63301039 rev=0x00 hdr=0x00

kldstat
Id Refs Address    Size     Name
 1    9 0xc0400000 911c50   kernel
 2    1 0xc0d12000 6f88     snd_ich.ko
 3    2 0xc0d19000 4a5ac    sound.ko
 4    1 0xc0d64000 6a2c4    acpi.ko
 5    1 0xc29ce000 22000    linux.ko

X.Org X Server 1.4.0
Release Date: 5 September 2007
X Protocol Version 11, Revision 0
Build Operating System: FreeBSD 7.0-STABLE i386 
Current Operating System: FreeBSD hack.SFT.local 7.0-STABLE FreeBSD 7.0-STABLE #0: Tue Apr  1 01:11:09 PDT 2008     root at hack.SFT.local:/usr/obj/usr/src/sys/GENERIC i386
Build Date: 24 March 2008  12:37:49PM

using 'sis' driver for Xorg in 1280x1024 mode (24bit color) with DRI enabled



>How-To-Repeat:
this problem usually appears when Xorg has been left running for several days.  Actually making it happen is difficult.  However, the following conditions are nearly always present:  a) firefox is open with several tabs, and graphics intensive web pages.  b) several gnome-terminal sessions are running on multiple desktops.  c) thunderbird or some other resource-intensive application is running.  d) dnetc is running in the background.  Occasionally, heavy disk access is also in progress, particularly with respect to the SATA drive on my system.
>Fix:
NOT running the screen savers reduces the frequency of the crashes.

>Release-Note:
>Audit-Trail:
>Unformatted: