Backtrace:
0: X(xf86SigHandler+0x65) [0x4761a5]
1: /lib64/libc.so.6 [0x388272f7c0]
2: /opt/X11R7/lib64/xorg/modules/extensions//libglx.so(__glXDeassociateContext+0xb) [0x2ae75e53869b]
3: /opt/X11R7/lib64/xorg/modules/extensions//libglx.so(__glXContextDestroy+0xf) [0x2ae75e5351ef]
4: /opt/X11R7/lib64/xorg/modules/extensions//libglx.so [0x2ae75e565d9a]
5: /opt/X11R7/lib64/xorg/modules/extensions//libglx.so(__glXFreeContext+0x6c) [0x2ae75e5374cc]
6: /opt/X11R7/lib64/xorg/modules/extensions//libglx.so [0x2ae75e5375e3]
7: X(FreeClientResources+0x74) [0x42f484]
8: X(CloseDownClient+0x1a6) [0x4401d6]
9: X(Dispatch+0x374) [0x4459a4]
10: X(main+0x46a) [0x42defa]
11: /lib64/libc.so.6(__libc_start_main+0xf4) [0x388271d084]
12: X(FontFileCompleteXLFD+0xa1) [0x42d1e9]

Fatal server error:
Caught signal 11.  Server aborting

xterm:  fatal IO error 32 (Broken pipe) or KillClient on X server ":0.0"