Comment 53 for bug 140554

I am sorry to crosspost this message (which I posted in https://bugs.launchpad.net/bugs/165093 but now I look back, I think it is better in this bug ID...)

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I am experiencing this bug more and more lately, twice today. I have seen an xorg update a few weeks ago, maybe that would be the reason? I am using nvidia TI4600, Compiz fusion and ubuntu gutsy gibbon on AMD Athlon XP2100+ w/ 1G ram. The crash of the x server is experienced when clicking in firefox on a link, and the system crashes before the link is actually opened (after logging in again, and starting firefox with 'resume session', the old page is displayed, not the page of which I clicked the link).

Similar bug as https://bugs.launchpad.net/bugs/140554 in which I posted a similar bug report a few weeks ago (found this thread by searching for the actual error of xorg/X FontFileComplete...., but the main error message in my syslog would be "gdm_slave_xioerror_handler: Fatal X error - Restarting :0"

Could it be firefox?
Could it be flash?
Could it be a bug in Xorg?
Someone tried another browser?
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Here's a printout of the latter part of /var/log/gdm/:0.log.1

(==) Using config file: "/etc/X11/xorg.conf"
(II) Module already built-in
SetClientVersion: 0 9
nvClipLock: client timed out, taking the lock

Backtrace:
0: /usr/bin/X(xf86SigHandler+0x81) [0x80c95d1]
1: [0xffffe420]
2: [0xbffdefe8]
3: /usr/bin/X [0x817ed0c]
4: /usr/bin/X(FreePicture+0x78) [0x8161a18]
5: /usr/bin/X(FreeResource+0x11d) [0x80789fd]
6: /usr/bin/X [0x816960a]
7: /usr/bin/X [0x8164425]
8: /usr/bin/X [0x815765e]
9: /usr/bin/X(Dispatch+0x1aa) [0x808f47a]
10: /usr/bin/X(main+0x495) [0x8076f05]
11: /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe0) [0xb7d08050]
12: /usr/bin/X(FontFileCompleteXLFD+0x1e1) [0x8076241]

Fatal server error:
Caught signal 11. Server aborting