.
Thread 5 (LWP 2656):
#0  0x00007f905efa147d in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f905f4e0694 in g_main_context_poll (priority=2147483647, n_fds=3, fds=0x7f90440010e0, timeout=-1, context=0x7f9063fe2240) at /build/buildd/glib2.0-2.38.0/./glib/gmain.c:4006
        poll_func = 0x7f905f4ef260 <g_poll>
#2  g_main_context_iterate (context=0x7f9063fe2240, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.38.0/./glib/gmain.c:3707
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 3
        allocated_nfds = 3
        fds = 0x7f90440010e0
#3  0x00007f905f4e0afa in g_main_loop_run (loop=0x7f9063fe21d0) at /build/buildd/glib2.0-2.38.0/./glib/gmain.c:3906
        __PRETTY_FUNCTION__ = "g_main_loop_run"
#4  0x00007f905fab59d6 in gdbus_shared_thread_func (user_data=0x7f9063fe2210) at /build/buildd/glib2.0-2.38.0/./gio/gdbusprivate.c:278
        data = 0x7f9063fe2210
#5  0x00007f905f5050e5 in g_thread_proxy (data=0x7f9063fce540) at /build/buildd/glib2.0-2.38.0/./glib/gthread.c:798
        thread = 0x7f9063fce540
#6  0x00007f905f282f6e in start_thread (arg=0x7f9049b6a700) at pthread_create.c:311
        __res = <optimized out>
        pd = 0x7f9049b6a700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140257688725248, -4449440652694979396, 0, 140258096709728, 140735190921136, 4096, 4422809857368718524, 4422771352298126524}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#7  0x00007f905efadecd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113
No locals.
.
Thread 4 (LWP 2659):
#0  0x00007f905efa147d in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f905f4e0694 in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7f90300010e0, timeout=-1, context=0x7f90641a8aa0) at /build/buildd/glib2.0-2.38.0/./glib/gmain.c:4006
        poll_func = 0x7f905f4ef260 <g_poll>
#2  g_main_context_iterate (context=0x7f90641a8aa0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.38.0/./glib/gmain.c:3707
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 1
        allocated_nfds = 1
        fds = 0x7f90300010e0
#3  0x00007f905f4e0afa in g_main_loop_run (loop=0x7f90300010c0) at /build/buildd/glib2.0-2.38.0/./glib/gmain.c:3906
        __PRETTY_FUNCTION__ = "g_main_loop_run"
#4  0x00007f9061550df3 in cal_client_dbus_thread (user_data=0x7f90641a8aa0) at e-cal-client.c:313
        main_context = 0x7f90641a8aa0
        main_loop = 0x7f90300010c0
#5  0x00007f905f5050e5 in g_thread_proxy (data=0x7f90641a4ad0) at /build/buildd/glib2.0-2.38.0/./glib/gthread.c:798
        thread = 0x7f90641a4ad0
#6  0x00007f905f282f6e in start_thread (arg=0x7f904278c700) at pthread_create.c:311
        __res = <optimized out>
        pd = 0x7f904278c700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140257567229696, -4449440652694979396, 0, 140258096709728, 140735190922688, 4096, 4422796232658713788, 4422771352298126524}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#7  0x00007f905efadecd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113
No locals.
.
Thread 3 (LWP 2658):
#0  0x00007f905efa147d in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f905f4e0694 in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7f903809d3c0, timeout=-1, context=0x7f906418d990) at /build/buildd/glib2.0-2.38.0/./glib/gmain.c:4006
        poll_func = 0x7f905f4ef260 <g_poll>
#2  g_main_context_iterate (context=0x7f906418d990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.38.0/./glib/gmain.c:3707
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 1
        allocated_nfds = 1
        fds = 0x7f903809d3c0
#3  0x00007f905f4e0afa in g_main_loop_run (loop=0x7f906418d7d0) at /build/buildd/glib2.0-2.38.0/./glib/gmain.c:3906
        __PRETTY_FUNCTION__ = "g_main_loop_run"
#4  0x00007f9061080677 in source_registry_object_manager_thread (data=0x7f9064106400) at e-source-registry.c:1105
        object_manager = 0x7f9044006d70
        closure = 0x7f9064106400
        idle_source = 0x7f903809d530
        list = <optimized out>
        link = <optimized out>
        object_added_handler_id = 185
        object_removed_handler_id = 186
        notify_name_owner_handler_id = 187
        __FUNCTION__ = "source_registry_object_manager_thread"
#5  0x00007f905f5050e5 in g_thread_proxy (data=0x7f90641084a0) at /build/buildd/glib2.0-2.38.0/./glib/gthread.c:798
        thread = 0x7f90641084a0
#6  0x00007f905f282f6e in start_thread (arg=0x7f9043fff700) at pthread_create.c:311
        __res = <optimized out>
        pd = 0x7f9043fff700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140257592866560, -4449440652694979396, 0, 140258096709728, 140735190923200, 4096, 4422797287610055868, 4422771352298126524}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#7  0x00007f905efadecd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113
No locals.
.
Thread 2 (LWP 2657):
#0  0x00007f905efa147d in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f905f4e0694 in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7f903c0010c0, timeout=-1, context=0x7f90641612e0) at /build/buildd/glib2.0-2.38.0/./glib/gmain.c:4006
        poll_func = 0x7f905f4ef260 <g_poll>
#2  g_main_context_iterate (context=context@entry=0x7f90641612e0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.38.0/./glib/gmain.c:3707
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 1
        allocated_nfds = 1
        fds = 0x7f903c0010c0
#3  0x00007f905f4e079c in g_main_context_iteration (context=0x7f90641612e0, may_block=1) at /build/buildd/glib2.0-2.38.0/./glib/gmain.c:3773
        retval = <optimized out>
#4  0x00007f9048d59a9d in ?? () from /tmp/apport_sandbox_2oI8XE/usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so
No symbol table info available.
#5  0x00007f905f5050e5 in g_thread_proxy (data=0x7f90640ae720) at /build/buildd/glib2.0-2.38.0/./glib/gthread.c:798
        thread = 0x7f90640ae720
#6  0x00007f905f282f6e in start_thread (arg=0x7f9048d52700) at pthread_create.c:311
        __res = <optimized out>
        pd = 0x7f9048d52700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140257673946880, -4449440652694979396, 0, 140258096709728, 140735190921424, 4096, 4422808504454020284, 4422771352298126524}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#7  0x00007f905efadecd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113
No locals.
.
Thread 1 (LWP 2643):
#0  0x00007f905eeeaf77 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
        resultvar = 0
        pid = 2643
        selftid = 2643
#1  0x00007f905eeee5e8 in __GI_abort () at abort.c:90
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x7f905f7d4b68, sa_sigaction = 0x7f905f7d4b68}, sa_mask = {__val = {140257257368720, 140258053817248, 140258094529653, 214748364805, 0, 4294967296, 140258044521704, 140258131917088, 140258053817248, 132, 140258094556933, 209, 51, 140258048427928, 0, 0}}, sa_flags = 0, sa_restorer = 0x20}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007f905f4e6fcd in _g_log_abort () at /build/buildd/glib2.0-2.38.0/./glib/gmessages.c:255
No locals.
#3  0x00007f905f5043a7 in g_assertion_message (domain=domain@entry=0x7f905f7d1f4e "GLib-GObject", file=file@entry=0x7f905f7d4b68 "/build/buildd/glib2.0-2.38.0/./gobject/gobject.c", line=line@entry=4300, func=func@entry=0x7f905f7d5448 <__FUNCTION__.13679> "g_weak_ref_set", message=message@entry=0x7f90642139f0 "assertion failed: (weak_locations != NULL)") at /build/buildd/glib2.0-2.38.0/./glib/gtestutils.c:2278
        lstr = "4300\000\177\000\000\340\370\017w\377\177\000\000NC}_\220\177\000\000\331F}_\220\177\000"
        s = 0x7f9064213920 "\230G'_\220\177"
#4  0x00007f905f50440a in g_assertion_message_expr (domain=domain@entry=0x7f905f7d1f4e "GLib-GObject", file=file@entry=0x7f905f7d4b68 "/build/buildd/glib2.0-2.38.0/./gobject/gobject.c", line=line@entry=4300, func=func@entry=0x7f905f7d5448 <__FUNCTION__.13679> "g_weak_ref_set", expr=expr@entry=0x7f905f7d46d9 "weak_locations != NULL") at /build/buildd/glib2.0-2.38.0/./glib/gtestutils.c:2293
        s = 0x7f90642139f0 "assertion failed: (weak_locations != NULL)"
#5  0x00007f905f7b3b46 in g_weak_ref_set (weak_ref=0x7f9044035d00, object=0x0) at /build/buildd/glib2.0-2.38.0/./gobject/gobject.c:4300
        weak_locations = 0x0
        new_object = 0x0
        old_object = <optimized out>
        __PRETTY_FUNCTION__ = "g_weak_ref_set"
        __FUNCTION__ = "g_weak_ref_set"
#6  0x00007f906155047b in signal_closure_free (signal_closure=0x7f9044035d00) at e-cal-client.c:182
No locals.
#7  0x00007f905f4dd498 in g_source_callback_unref (cb_data=0x7f9030012f30) at /build/buildd/glib2.0-2.38.0/./glib/gmain.c:1549
        cb_data = 0x7f9030012f30
        callback = 0x7f9030012f30
#8  0x00007f905f4dd9e7 in g_source_destroy_internal (source=source@entry=0x7f903000ac90, context=context@entry=0x7f9063fdd060, have_lock=have_lock@entry=1) at /build/buildd/glib2.0-2.38.0/./glib/gmain.c:1208
        tmp_list = <optimized out>
        old_cb_data = 0x7f9030012f30
        old_cb_funcs = 0x7f905f797940 <g_source_callback_funcs>
#9  0x00007f905f4e03f0 in g_main_dispatch (context=0x7f9063fdd060) at /build/buildd/glib2.0-2.38.0/./glib/gmain.c:3089
        dispatch = <optimized out>
        was_in_call = 0
        user_data = 0x7f9044035d00
        callback = 0x7f9061550b50 <cal_client_emit_backend_property_changed_idle_cb>
        cb_funcs = 0x7f905f797940 <g_source_callback_funcs>
        cb_data = 0x7f9030012f30
        need_destroy = 1
        current_source_link = {data = 0x7f903000ac90, next = 0x0}
        source = 0x7f903000ac90
        current = 0x7f90640179b0
        i = 0
#10 g_main_context_dispatch (context=context@entry=0x7f9063fdd060) at /build/buildd/glib2.0-2.38.0/./glib/gmain.c:3641
No locals.
#11 0x00007f905f4e06f8 in g_main_context_iterate (context=context@entry=0x7f9063fdd060, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.38.0/./glib/gmain.c:3712
        max_priority = 200
        timeout = 0
        some_ready = 1
        nfds = <optimized out>
        allocated_nfds = 3
        fds = 0x7f90641952b0
#12 0x00007f905f4e079c in g_main_context_iteration (context=0x7f9063fdd060, context@entry=0x0, may_block=may_block@entry=1) at /build/buildd/glib2.0-2.38.0/./glib/gmain.c:3773
        retval = <optimized out>
#13 0x00007f905fa83a2c in g_application_run (application=0x7f906413d0f0, argc=1, argv=0x7fff770ffc68) at /build/buildd/glib2.0-2.38.0/./gio/gapplication.c:1635
        arguments = 0x7f90641952b0
        status = 0
        i = <optimized out>
        __PRETTY_FUNCTION__ = "g_application_run"
#14 0x00007f9062088a62 in main ()
No symbol table info available.