Binary package hint: xorg
The combination of firefox and flash causes X to crash; in particular the facebook flair app navigation buttons are reliable reproducers for this behavior.
In my case, the radeon 7500 I have is built into the mobo chipset and uses an adjustable amount of system RAM for it's frame buffer RAM. I was not able to initially reproduce with the bios set to allocate 64MB of ram to the video chipset, but dropping it to 32M causes it to reproduce reliably. See the Xorg.0.log.old for the segv backtrace; annoyingly, apport is enabled but did not catch the crash.
ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: xorg 1:7.5+5ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-21-generic x86_64
Architecture: amd64
Date: Wed Apr 28 22:39:12 2010
DkmsStatus:
MachineType: Shuttle Inc SA76
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-21-generic root=UUID=d0bdf9c0-39bd-4341-9b8f-0d827c82dc5c ro splash quiet
ProcEnviron:
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: xorg
dmi.bios.date: 03/19/2010
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: 6.00 PG
dmi.board.name: FA76
dmi.board.vendor: Shuttle Inc
dmi.board.version: V10
dmi.chassis.type: 3
dmi.chassis.vendor: Shuttle Inc
dmi.chassis.version: G2
dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvr6.00PG:bd03/19/2010:svnShuttleInc:pnSA76:pvrV10:rvnShuttleInc:rnFA76:rvrV10:cvnShuttleInc:ct3:cvrG2:
dmi.product.name: SA76
dmi.product.version: V10
dmi.sys.vendor: Shuttle Inc
system:
distro: Ubuntu
codename: lucid
architecture: x86_64
kernel: 2.6.32-21-generic
Confirming as I also see this with my T42 that has a radeon 7500 with (unfortunately unadjustable) 32MB RAM.