xorg crashes during updates

[Michael Cronenworth]

I've had bad things happening during updates when using PackageKit. When 
PackageKit is updating (download stage or update stage) and I press 
ALT-TAB then X crashes with this backtrace:

0: /usr/bin/Xorg(xorg_backtrace+0x3b) [0x812bc5b]
1: /usr/bin/Xorg(xf86SigHandler+0x51) [0x80bcc81]
2: [0x337400]
3: /usr/bin/Xorg(miHandleValidateExposures+0x37) [0x8123837]
4: /usr/bin/Xorg(UnmapWindow+0x1f8) [0x8070818]
5: /usr/bin/Xorg(compFreeClientWindow+0x23a) [0x813e74a]
6: /usr/bin/Xorg [0x813bbf4]
7: /usr/bin/Xorg(FreeResource+0x10c) [0x806e01c]
8: /usr/bin/Xorg(compUnredirectWindow+0x7b) [0x813e2eb]
9: /usr/bin/Xorg [0x813c54e]
10: /usr/bin/Xorg [0x8123e55]
11: /usr/bin/Xorg [0x8123d6c]
12: /usr/bin/Xorg(miChangeSaveUnder+0x6b) [0x8123f0b]
13: /usr/bin/Xorg(MapWindow+0x37b) [0x8070f7b]
14: /usr/bin/Xorg(ProcMapWindow+0x69) [0x8085619]
15: /usr/bin/Xorg(Dispatch+0x34f) [0x8085e9f]
16: /usr/bin/Xorg(main+0x47d) [0x806b71d]
17: /lib/libc.so.6(__libc_start_main+0xe5) [0x99c6e5]
18: /usr/bin/Xorg [0x806ab01]


ALT-TAB is an "always reproducible" case. An "occasionally reproducible" 
case is when I'm using the mouse inside the PackageKit dialogues, or X 
just decides to crash sometime randomly during the update process.

This is with compiz on or off. nVidia binary driver in use.
GeForce 5200 FX. I've only seen this happen on this card.