.
Thread 5 (LWP 26266):
#0  0x00007f2d7aa5c39d in ?? () from /tmp/apport_sandbox_B3b_ye/lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 4 (LWP 26237):
#0  0x00007f2d7aa5c39d in ?? () from /tmp/apport_sandbox_B3b_ye/lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 3 (LWP 26227):
#0  0x00007f2d7aa5c39d in ?? () from /tmp/apport_sandbox_B3b_ye/lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 2 (LWP 26226):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
No locals.
#1  0x00007f2d7b2e0ea5 in g_system_thread_new (thread_func=0x1, stack_size=22981904, error=0xc72c7a28f) at /build/buildd/glib2.0-2.35.7/./glib/gthread-posix.c:1116
        thread = 0x15eacc8
        attr = {__size = "\230:\000\000\000\000\000\000\330\254^\001\000\000\000\000\300\254^\001\000\000\000\000\021y'{-\177\000\000\300\254^\001\000\000\000\000\300\341\344\000\000\000\000\000\317\300\342q\f\000\000", __align = 15000}
        ret = <optimized out>
        __PRETTY_FUNCTION__ = "g_system_thread_new"
#2  0x00007f2d7b2c5d62 in g_thread_pool_push (pool=<optimized out>, data=<optimized out>, error=<optimized out>) at /build/buildd/glib2.0-2.35.7/./glib/gthreadpool.c:571
        real = <optimized out>
        result = <optimized out>
        __PRETTY_FUNCTION__ = "g_thread_pool_push"
#3  0x00007f2d7b2c5565 in g_thread_self () at /build/buildd/glib2.0-2.35.7/./glib/gthread.c:1001
        thread = 0xfffffffffffffdfc
#4  0x00007f2d74c7a700 in ?? ()
No symbol table info available.
#5  0x00007f2d74c7a700 in ?? ()
No symbol table info available.
#6  0xf5ed9799b2bfd221 in ?? ()
No symbol table info available.
#7  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 1 (LWP 26225):
#0  wl_proxy_get_user_data (proxy=proxy@entry=0x0) at ../../src/wayland-client.c:1114
No locals.
#1  0x00007f2d7ce86949 in wl_surface_get_user_data (wl_surface=0x0) at /usr/include/wayland-client-protocol.h:1217
No locals.
#2  pointer_handle_enter (data=0x15d2830, pointer=<optimized out>, serial=<optimized out>, surface=0x0, sx=19968, sy=0) at /build/buildd/gtk+3.0-3.6.4/./gdk/wayland/gdkdevice-wayland.c:963
        device = 0x15d2830
        event = <optimized out>
        wayland_display = <optimized out>
#3  0x00007f2d764b6bc8 in ffi_closure_unix64_inner (closure=0x4e00, rvalue=0x15ea770, reg_args=0x16b, argp=0x7fffe8ddaeb4 "\001") at ../src/x86/ffi64.c:671
        cif = 0x0
        avalue = 0x0
        arg_types = <optimized out>
        i = <optimized out>
        avn = <optimized out>
        gprcount = 0
        ssecount = <optimized out>
        ngpr = 0
        nsse = 0
        ret = 0
#4  0x00007fffe8ddaf2c in ?? ()
No symbol table info available.
#5  0x00007fffe8ddaf00 in ?? ()
No symbol table info available.
#6  0x00007f2d764b65d0 in ffi_call (cif=<error reading variable: Cannot access memory at address 0xffffffffffffff80>, fn=<error reading variable: Cannot access memory at address 0xffffffffffffff70>, rvalue=<error reading variable: Cannot access memory at address 0xffffffffffffff78>, avalue=0x7fffe8ddae10) at ../src/x86/ffi64.c:471
        align = <optimized out>
        size = 140737100230324
        n = 0
        classes = <error reading variable classes (Cannot access memory at address 0xffffffffffffffb0)>
        stack = <error reading variable stack (Cannot access memory at address 0xffffffffffffff88)>
        argp = 0x7fffe8ddae11 ""
        arg_types = 0x1bc4010
        gprcount = <error reading variable gprcount (Cannot access memory at address 0xffffffffffffff94)>
        ssecount = <optimized out>
        ngpr = <error reading variable ngpr (Cannot access memory at address 0xffffffffffffffa8)>
        nsse = <error reading variable nsse (Cannot access memory at address 0xffffffffffffffac)>
        i = <optimized out>
        avn = <optimized out>
        ret_in_memory = <optimized out>
        reg_args = <error reading variable reg_args (Cannot access memory at address 0xffffffffffffff88)>
Backtrace stopped: previous frame inner to this frame (corrupt stack?)