xorg crashes: where do I file in bugzilla?

[sean]

X crashes on me at seemingly random intervals when I click a 
button in a dialog box.

 From Xorg.0.log:

Backtrace:
0: X(xf86SigHandler+0x71) [0x486391]
1: /lib64/libc.so.6 [0x351c430140]
2: 
/usr/lib64/xorg/modules/extensions/libGLcore.so(xmesa_check_and_update_buffer_size+0xc) 
[0x2aaaaecfdbcc]
3: /usr/lib64/xorg/modules/extensions/libGLcore.so 
[0x2aaaaed004cd]
4: /usr/lib64/xorg/modules/extensions/libglx.so [0x2aaaab5e935b]
5: X(compPositionWindow+0x62) [0x54df92]
6: X(ResizeChildrenWinSize+0x1ce) [0x4384ee]
7: X(miMoveWindow+0x11a) [0x4dd7fa]
8: X(compMoveWindow+0xab) [0x54eefb]
9: X(ConfigureWindow+0x776) [0x437ba6]
10: X(ProcConfigureWindow+0x96) [0x4494c6]
11: X(Dispatch+0x1ca) [0x449c4a]
12: X(main+0x455) [0x432585]
13: /lib64/libc.so.6(__libc_start_main+0xf4) [0x351c41d924]
14: X(FontFileCompleteXLFD+0x229) [0x431879]

Fatal server error:
Caught signal 11.  Server aborting


Where do I file this?

xorg, Mesa ? If so, which package?

sean