$ gdb =weston /tmp/weston.core.11686
Reading symbols from /usr/bin/weston...(no debugging symbols found)...done.
[New LWP 11686]

warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
backtrace 
warning: no loadable sections found in added symbol-file system-supplied DSO at 0x7fff06426000
Core was generated by `weston'.
Program terminated with signal 11, Segmentation fault.
f#0  _mesa_DeleteTextures (n=n@entry=1, textures=textures@entry=0x1c02c48) at ../../../../src/mesa/main/texobj.c:1200
1200	../../../../src/mesa/main/texobj.c: No such file or directory.
gdb $ backtrace full
#0  _mesa_DeleteTextures (n=n@entry=1, textures=textures@entry=0x1c02c48) at ../../../../src/mesa/main/texobj.c:1200
        ctx = 0x0
        i = <optimized out>
#1  0x00007ff66912b4ac in _mesa_meta_glsl_blit_cleanup (blit=0x1c02b00) at ../../../../src/mesa/drivers/common/meta_blit.c:759
No locals.
#2  0x00007ff66912c6c4 in _mesa_meta_free (ctx=ctx@entry=0x7ff67280e038) at ../../../../src/mesa/drivers/common/meta.c:424
        old_context = 0x0
#3  0x00007ff66923e3f0 in intelDestroyContext (driContextPriv=0x1b576d0) at ../../../../../../../src/mesa/drivers/dri/i965/brw_context.c:804
        brw = 0x7ff67280e038
        ctx = 0x7ff67280e038
#4  0x00007ff6691de673 in driDestroyContext (pcp=0x1b576d0) at ../../../../../../../src/mesa/drivers/dri/common/dri_util.c:487
No locals.
#5  0x00007ff66f04a099 in dri2_destroy_context (drv=<optimized out>, disp=<optimized out>, ctx=0x1b26ed0) at ../../../../../../src/egl/drivers/dri2/egl_dri2.c:945
No locals.
#6  0x00007ff66f045bca in _eglReleaseDisplayResources (drv=0x1b3fdc0, display=display@entry=0x1b33800) at ../../../../../src/egl/main/egldisplay.c:302
        ctx = 0x1b26ed0
        list = 0x0
        __PRETTY_FUNCTION__ = "_eglReleaseDisplayResources"
#7  0x00007ff66f04a492 in dri2_terminate (drv=<optimized out>, disp=0x1b33800) at ../../../../../../src/egl/drivers/dri2/egl_dri2.c:666
No locals.
#8  0x00007ff66f0419e2 in eglTerminate (dpy=0x1b33800) at ../../../../../src/egl/main/eglapi.c:383
        drv = <optimized out>
        __func__ = "eglTerminate"
#9  0x00007ff66ca67e2a in ?? () from /usr/lib/x86_64-linux-gnu/weston/gl-renderer.so
No symbol table info available.
#10 0x00007ff670e49021 in backend_init () from /usr/lib/x86_64-linux-gnu/weston/x11-backend.so
No symbol table info available.
#11 0x00000000004074b0 in ?? ()
No symbol table info available.
#12 0x00007ff67169eb45 in __libc_start_main (main=0x407050, argc=1, argv=0x7fff0641d3d8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff0641d3c8) at libc-start.c:287
        result = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {0, 5241985423766744711, 4225538, 140733298365392, 0, 0, -5241827696045691257, -5236658134673625465}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x419a10 <__libc_csu_init>, 0x7fff0641d3d8}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 4299280
            }
          }
        }
        not_first_call = <optimized out>
#13 0x0000000000407a2b in _start ()
No symbol table info available.