Reliably reproducible using the intel driver. Setting Option "AccelMethod" "XAA" gets things working again.
Backtrace:
0: X(xf86SigHandler+0x79) [0x80c2139]
1: [0xb7f24420]
2: /usr/lib/xorg/modules//libfb.so(fbFill+0x474) [0xb783d354]
3: /usr/lib/xorg/modules//libfb.so(fbPolyFillRect+0x1c4) [0xb783d564]
4: /usr/lib/xorg/modules//libexa.so(ExaCheckPolyFillRect+0x52) [0xb7827012]
5: /usr/lib/xorg/modules//libexa.so [0xb782234d]
6: X [0x8172a74]
7: X(CreateDefaultStipple+0x10b) [0x809b9fb]
8: X(main+0x30e) [0x807154e]
9: /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe5) [0xb7b2f685]
10: X(FontFileCompleteXLFD+0x239) [0x8070aa1]
ProblemType: Bug
Architecture: i386
Date: Tue Jul 8 14:12:38 2008
DistroRelease: Ubuntu 8.10
Package: xserver-xorg-core 2:1.4.99.905-0ubuntu2
PackageArchitecture: i386
ProcEnviron:
LC_COLLATE=C
PATH=/home/username/bin:/usr/lib/ccache:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/sbin:/usr/sbin:/usr/games:/usr/lib/surfraw
LANG=en_US.UTF-8
SHELL=/bin/zsh
ProcVersion: Linux version 2.6.24-19-generic (buildd@palmer) (gcc version 4.2.3 (Ubuntu 4.2.3-2ubuntu7)) #1 SMP Wed Jun 18 14:43:41 UTC 2008
SourcePackage: xorg-server
Uname: Linux 2.6.24-19-generic i686
<tjaalton> mdz: the intel bug was not on the server after all. it's the "force greedy exa" patch on intel