.
Thread 4 (LWP 5403):
#0  0x00007fd78989083d in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007fd7878a733c in ?? ()
No symbol table info available.
#2  0x0000000000000020 in ?? ()
No symbol table info available.
#3  0x000000017c0017a0 in ?? ()
No symbol table info available.
#4  0xffffffff7fffffff in ?? ()
No symbol table info available.
#5  0x72eeeff34ed43500 in ?? ()
No symbol table info available.
#6  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 3 (LWP 5401):
#0  0x00007fd78989083d in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007fd7878a733c in ?? ()
No symbol table info available.
#2  0x00007fff360b540f in ?? ()
No symbol table info available.
#3  0x0000000187b6c900 in ?? ()
No symbol table info available.
#4  0x000061a77fffffff in ?? ()
No symbol table info available.
#5  0x72eeeff34ed43500 in ?? ()
No symbol table info available.
#6  0x0000000001ca7b70 in ?? ()
No symbol table info available.
#7  0x0000000001ca7b70 in ?? ()
No symbol table info available.
#8  0x0000000000000001 in ?? ()
No symbol table info available.
#9  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 2 (LWP 5402):
#0  0x00007fd78989083d in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007fd7878a733c in ?? ()
No symbol table info available.
#2  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 1 (LWP 5375):
#0  0x00007fd7897ca227 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:55
        resultvar = 0
        pid = 5375
        selftid = 5375
#1  0x00007fd7897cbe8a in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x559b60 <type_call.lto_priv>, sa_sigaction = 0x559b60 <type_call.lto_priv>}, sa_mask = {__val = {140563650148667, 27551040, 5832366, 30117304, 8281820593059542272, 16, 0, 140563650120584, 8281820593059542272, 2, 140734100100768, 8, 5328433, 67, 140563650148664, 18446603339609450849}}, sa_flags = 906712735, sa_restorer = 0x0}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007fd78980dbb3 in __libc_message (do_abort=do_abort@entry=1, fmt=fmt@entry=0x7fd789926128 "*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/posix/libc_fatal.c:175
        ap = {{gp_offset = 40, fp_offset = 0, overflow_arg_area = 0x7fff360b58f0, reg_save_area = 0x7fff360b5880}}
        fd = 2
        on_2 = <optimized out>
        list = <optimized out>
        nlist = <optimized out>
        cp = <optimized out>
        written = <optimized out>
#3  0x00007fd789815bc9 in malloc_printerr (ptr=<optimized out>, str=0x7fd7899261a0 "free(): invalid next size (fast)", action=1) at malloc.c:4965
        buf = "0000000001ca17b0"
        cp = <optimized out>
#4  _int_free (av=<optimized out>, p=<optimized out>, have_lock=0) at malloc.c:3834
        size = <optimized out>
        fb = <optimized out>
        nextchunk = <optimized out>
        nextsize = <optimized out>
        prevsize = <optimized out>
        bck = <optimized out>
        fwd = <optimized out>
        errstr = <optimized out>
        locked = <optimized out>
#5  0x00007fd7898197fc in __GI___libc_free (mem=<optimized out>) at malloc.c:2950
        ar_ptr = <optimized out>
        p = <optimized out>
        hook = <optimized out>
#6  0x00007fd78801d3be in _pygi_closure_handle () from /tmp/apport_sandbox_zFmgT3/usr/lib/python3/dist-packages/gi/_gi.cpython-35m-x86_64-linux-gnu.so
No symbol table info available.
#7  0x00007fd78765ac2f in ffi_closure_unix64_inner () from /tmp/apport_sandbox_zFmgT3/usr/lib/x86_64-linux-gnu/libffi.so.6
No symbol table info available.
#8  0x00007fd78765afa8 in ffi_closure_unix64 () from /tmp/apport_sandbox_zFmgT3/usr/lib/x86_64-linux-gnu/libffi.so.6
No symbol table info available.
#9  0x00007fd786459c69 in unity_scope_loader_load_and_export (self=self@entry=0x1c21d30, module=0x1ca7160 "calculator.unity_calculator_daemon", module_type=0x1ca7ae0 "python3", error=error@entry=0x7fff360b5ce0) at unity-scope-loader.c:329
        _tmp0_ = <optimized out>
        _tmp4_ = <optimized out>
        _tmp5_ = 0x1ca7160 "calculator.unity_calculator_daemon"
        _tmp6_ = <optimized out>
        module_scopes = 0x0
        _tmp7_ = 0x1ca7160 "calculator.unity_calculator_daemon"
        _tmp8_ = 0x1ca7ae0 "python3"
        _tmp9_ = 0x0
        _tmp10_ = 0x0
        _tmp11_ = 0x0
        _tmp12_ = 0x0
        _tmp13_ = 0x0
        _inner_error_ = 0x0
        __func__ = "unity_scope_loader_load_and_export"
#10 0x00007fd786459fd4 in unity_scope_loader_load_scope (self=0x1c21d30, scope_id=<optimized out>, error=0x7fff360b5f10) at unity-scope-loader.c:452
        metadata = 0x1ca9040
        _tmp0_ = <optimized out>
        _tmp1_ = 0x1ca9040
        _tmp2_ = 0x1ca9040
        _tmp3_ = <optimized out>
        _tmp4_ = 0x1ca9040
        _tmp5_ = <optimized out>
        _tmp6_ = 0x1ca9040
        _tmp7_ = <optimized out>
        _inner_error_ = 0x0
        __func__ = "unity_scope_loader_load_scope"
#11 0x00007fd78765ae40 in ffi_call_unix64 () from /tmp/apport_sandbox_zFmgT3/usr/lib/x86_64-linux-gnu/libffi.so.6
No symbol table info available.
#12 0x00007fd78765a8ab in ffi_call () from /tmp/apport_sandbox_zFmgT3/usr/lib/x86_64-linux-gnu/libffi.so.6
No symbol table info available.
#13 0x00007fd78801f364 in pygi_invoke_c_callable () from /tmp/apport_sandbox_zFmgT3/usr/lib/python3/dist-packages/gi/_gi.cpython-35m-x86_64-linux-gnu.so
No symbol table info available.
#14 0x00007fd788021048 in pygi_function_cache_invoke () from /tmp/apport_sandbox_zFmgT3/usr/lib/python3/dist-packages/gi/_gi.cpython-35m-x86_64-linux-gnu.so
No symbol table info available.
#15 0x00007fd788015d15 in _callable_info_call () from /tmp/apport_sandbox_zFmgT3/usr/lib/python3/dist-packages/gi/_gi.cpython-35m-x86_64-linux-gnu.so
No symbol table info available.
#16 0x000000000058feae in PyObject_Call ()
No symbol table info available.
#17 0x0000000000514e31 in PyEval_EvalFrameEx ()
No symbol table info available.
#18 0x000000000051498f in PyEval_EvalFrameEx ()
No symbol table info available.
#19 0x0000000000518ca8 in _PyEval_EvalCodeWithName.lto_priv.1327 ()
No symbol table info available.
#20 0x00000000005f800f in PyEval_EvalCode ()
No symbol table info available.
#21 0x0000000000608e12 in run_mod ()
No symbol table info available.
#22 0x000000000060afda in PyRun_FileExFlags ()
No symbol table info available.
#23 0x000000000060b79c in PyRun_SimpleFileExFlags ()
No symbol table info available.
#24 0x000000000062b8f0 in Py_Main ()
No symbol table info available.
#25 0x00000000004cbc9f in main ()
No symbol table info available.