While resizing dolphin running with QT4's opengl backend, I got this crash.
I am running 2.6.31rc6 + the latest packages shipped by fedora rawhide (2.8.0 + xorg-1.6.99.901).

Program received signal SIGSEGV, Segmentation fault.
0x008da624 in intelDestroyContext (driContextPriv=0x927c350)
    at intel_context.c:857
857              if (intel_fb->color_rb[0] && intel_fb->color_rb[0]->region == i                                          ntel->front_region) {
(gdb) bt
#0  0x008da624 in intelDestroyContext (driContextPriv=0x927c350)
    at intel_context.c:857
#1  0x008bc3f8 in driDestroyContext (pcp=0x927c350) at ../common/dri_util.c:546
#2  0x005d277a in __glXDRIcontextDestroy (baseContext=0x9308e28)
    at glxdri2.c:201
#3  0x005c6571 in __glXFreeContext (cx=0x9308e28) at glxext.c:211
#4  0x005c65cc in ContextGone (cx=0x0, id=29360207) at glxext.c:110
#5  0x0808c53f in FreeClientResources (client=0x96678d8) at resource.c:812
#6  0x080696e0 in CloseDownClient (client=0x96678d8) at dispatch.c:3617
#7  0x0806e5f8 in Dispatch () at dispatch.c:437
#8  0x08062a35 in main (argc=6, argv=0xbfd0e6d4, envp=0xbfd0e6f0) at main.c:285