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X server segfaults, xmesa_check_and_update_buffer_size



I've just reinstalled F7 on my desktop machine. It was previously running F7 without any particular problems (well, I managed to remove the rpm package, hence the need to reinstall). Now the X server segfaults frequently.

This is the message printed in the Xorg.0.log:

Backtrace:
0: /usr/bin/Xorg(xf86SigHandler+0x6d) [0x48b99d]
1: /lib64/libc.so.6 [0x3649430900]
2: /usr/lib64/xorg/modules/extensions//libGLcore.so(xmesa_check_and_update_buffer_size+0xc) [0x2aaab1e0914c]
3: /usr/lib64/xorg/modules/extensions//libGLcore.so [0x2aaab1e3941d]
4: /usr/lib64/xorg/modules/extensions//libglx.so [0x2aaaab1b073b]
5: /usr/bin/Xorg(compPositionWindow+0x62) [0x4bf7c2]
6: /usr/bin/Xorg(ResizeChildrenWinSize+0x1ce) [0x43a7de]
7: /usr/bin/Xorg(miSlideAndSizeWindow+0x1ab) [0x4f22db]
8: /usr/bin/Xorg(compResizeWindow+0xad) [0x4c063d]
9: /usr/bin/Xorg(ConfigureWindow+0xb8d) [0x43a31d]
10: /usr/bin/Xorg(ProcConfigureWindow+0x96) [0x44b306]
11: /usr/bin/Xorg(Dispatch+0x1db) [0x44ba9b]
12: /usr/bin/Xorg(main+0x45d) [0x43480d]
13: /lib64/libc.so.6(__libc_start_main+0xf4) [0x364941dd34]
14: /usr/bin/Xorg(FontFileCompleteXLFD+0x229) [0x433ad9]

Fatal server error:
Caught signal 11.  Server aborting

It's got an nVidia graphics card but I'm using the free nv driver (as I was before). I don't suspect hardware, because the problem has only started to happen since the reinstall.

Debian seem to have seen & fixed a similar bug: http://lists.debian.org/debian-x/2007/08/msg00287.html

There are a couple of RHBZs on this, but with no particular resolution:
https://bugzilla.redhat.com/show_bug.cgi?id=244627
https://bugzilla.redhat.com/show_bug.cgi?id=235625

Ideas?

Rich.

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