#0  0x00002aaaac9b8895 in raise () from /lib64/libc.so.6
#1  0x00002aaaac9ba340 in abort () from /lib64/libc.so.6
#2  0x00002aaaac9b1c9f in __assert_fail () from /lib64/libc.so.6
#3  0x00002aaab40d23dd in _mesa_reference_texobj (ptr=0x7fffcfbbb6d0,
#tex=0x0,
    where=<value optimized out>) at main/texobj.c:278
#4  0x00002aaab417b275 in _mesa_free_attrib_data (ctx=0x7bd4c0)
    at main/attrib.c:1472
#5  0x00002aaab407adba in _mesa_free_context_data (ctx=0x7bd4c0)
    at main/context.c:1208
#6  0x00002aaab407aede in _mesa_destroy_context (ctx=0x7bd4c0)
    at main/context.c:1259
#7  0x00002aaab404cb1c in radeonCleanupContext (radeon=0x76b9d0)
    at radeon_context.c:202
#8  0x00002aaab40529c5 in r300DestroyContext (
    driContextPriv=<value optimized out>) at r300_context.c:523
#9  0x00002aaab4047e9a in driDestroyContext (dpy=0x6c4d30, scrn=0,
    contextPrivate=0x6) at ../common/dri_util.c:755
#10 0x00002aaaab8d4fc5 in DestroyContext (dpy=0x6c4d30, gc=0x763d90)
    at glxcmds.c:472
#11 0x00002aaaabd7ea92 in __gxx_personality_v0 ()
   from /usr/lib64/libSDL-1.2.so.0
#12 0x00002aaaabd8288e in __gxx_personality_v0 ()
   from /usr/lib64/libSDL-1.2.so.0
#13 0x00002aaaabd82a97 in __gxx_personality_v0 ()
#14 0x00002aaaabd72482 in SDL_VideoQuit () from /usr/lib64/libSDL-1.2.so.0
#15 0x00002aaaabd4cde5 in SDL_QuitSubSystem () from
#/usr/lib64/libSDL-1.2.so.0
#16 0x00002aaaabd4ce4e in SDL_Quit () from /usr/lib64/libSDL-1.2.so.0
#17 0x00002aaaac9bb719 in exit () from /lib64/libc.so.6
#18 0x000000000042cc68 in __gxx_personality_v0 ()
#19 0x0000000000405fe9 in __gxx_personality_v0 ()
#20 0x00002aaaaad2c8cf in __gxx_personality_v0 ()
   from /usr/lib64/libguile.so.17
#21 0x00002aaaaad0453a in __gxx_personality_v0 ()
   from /usr/lib64/libguile.so.17
#22 0x00002aaaaad678d5 in scm_c_catch () from /usr/lib64/libguile.so.17