.
Thread 7 (LWP 3804):
#0  0x00007ff8a23c55ad in poll () at ../sysdeps/unix/syscall-template.S:84
No locals.
#1  0x00007ff8a28fb32c in g_main_context_iterate.isra () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#2  0x00007ff8a28fb6b2 in g_main_loop_run () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007ff873a68875 in operator() (this=0x7ff86de20bc0) at /usr/include/c++/5/functional:2267
No locals.
#4  WTF::threadEntryPoint (contextData=0x7ff871df3140) at /build/webkit2gtk-YdtF1g/webkit2gtk-2.10.9/Source/WTF/wtf/Threading.cpp:58
        context = 0x7ff871df3140
        entryPoint = {<std::_Maybe_unary_or_binary_function<void>> = {<No data fields>}, <std::_Function_base> = {static _M_max_size = 16, static _M_max_align = 8, _M_functor = {_M_unused = {_M_object = 0x1767ad0, _M_const_object = 0x1767ad0, _M_function_pointer = 0x1767ad0, _M_member_pointer = (void (std::_Undefined_class::*)(std::_Undefined_class * const)) 0x1767ad0, this adjustment 3078298299393614592}, _M_pod_data = "\320zv\001\000\000\000\000\000\243\vh\376O\270*"}, _M_manager = 0x7ff873a8ee60 <std::_Function_base::_Base_manager<WTF::WorkQueue::platformInitialize(char const*, WTF::WorkQueue::Type, WTF::WorkQueue::QOS)::<lambda()> >::_M_manager(std::_Any_data &, const std::_Any_data &, std::_Manager_operation)>}, _M_invoker = 0x7ff873a8edd0 <std::_Function_handler<void(), WTF::WorkQueue::platformInitialize(char const*, WTF::WorkQueue::Type, WTF::WorkQueue::QOS)::<lambda()> >::_M_invoke(const std::_Any_data &)>}
#5  0x00007ff873a892ca in WTF::wtfThreadEntryPoint (param=0x7ff871dfa030) at /build/webkit2gtk-YdtF1g/webkit2gtk-2.10.9/Source/WTF/wtf/ThreadingPthreads.cpp:167
        invocation = {_M_t = {<std::_Tuple_impl<0ul, WTF::ThreadFunctionInvocation*, std::default_delete<WTF::ThreadFunctionInvocation> >> = {<std::_Tuple_impl<1ul, std::default_delete<WTF::ThreadFunctionInvocation> >> = {<std::_Head_base<1ul, std::default_delete<WTF::ThreadFunctionInvocation>, true>> = {<std::default_delete<WTF::ThreadFunctionInvocation>> = {<No data fields>}, <No data fields>}, <No data fields>}, <std::_Head_base<0ul, WTF::ThreadFunctionInvocation*, false>> = {_M_head_impl = 0x7ff871dfa030}, <No data fields>}, <No data fields>}}
#6  0x00007ff8a269b6fa in start_thread (arg=0x7ff86de21700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7ff86de21700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140704972150528, 1683505151958155207, 0, 140721148176719, 140704972151232, 25465024, -1680448765850189881, -1680889570872557625}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#7  0x00007ff8a23d12dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.
.
Thread 6 (LWP 3806):
#0  0x00007ff8a23c55ad in poll () at ../sysdeps/unix/syscall-template.S:84
No locals.
#1  0x00007ff8a28fb32c in g_main_context_iterate.isra () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#2  0x00007ff8a28fb6b2 in g_main_loop_run () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007ff873a68875 in operator() (this=0x7ff86ce1ebc0) at /usr/include/c++/5/functional:2267
No locals.
#4  WTF::threadEntryPoint (contextData=0x7ff871df3190) at /build/webkit2gtk-YdtF1g/webkit2gtk-2.10.9/Source/WTF/wtf/Threading.cpp:58
        context = 0x7ff871df3190
        entryPoint = {<std::_Maybe_unary_or_binary_function<void>> = {<No data fields>}, <std::_Function_base> = {static _M_max_size = 16, static _M_max_align = 8, _M_functor = {_M_unused = {_M_object = 0x1871fe0, _M_const_object = 0x1871fe0, _M_function_pointer = 0x1871fe0, _M_member_pointer = (void (std::_Undefined_class::*)(std::_Undefined_class * const)) 0x1871fe0}, _M_pod_data = "\340\037\207\001", '\000' <repeats 11 times>}, _M_manager = 0x7ff873a8ee60 <std::_Function_base::_Base_manager<WTF::WorkQueue::platformInitialize(char const*, WTF::WorkQueue::Type, WTF::WorkQueue::QOS)::<lambda()> >::_M_manager(std::_Any_data &, const std::_Any_data &, std::_Manager_operation)>}, _M_invoker = 0x7ff873a8edd0 <std::_Function_handler<void(), WTF::WorkQueue::platformInitialize(char const*, WTF::WorkQueue::Type, WTF::WorkQueue::QOS)::<lambda()> >::_M_invoke(const std::_Any_data &)>}
#5  0x00007ff873a892ca in WTF::wtfThreadEntryPoint (param=0x7ff871dfa050) at /build/webkit2gtk-YdtF1g/webkit2gtk-2.10.9/Source/WTF/wtf/ThreadingPthreads.cpp:167
        invocation = {_M_t = {<std::_Tuple_impl<0ul, WTF::ThreadFunctionInvocation*, std::default_delete<WTF::ThreadFunctionInvocation> >> = {<std::_Tuple_impl<1ul, std::default_delete<WTF::ThreadFunctionInvocation> >> = {<std::_Head_base<1ul, std::default_delete<WTF::ThreadFunctionInvocation>, true>> = {<std::default_delete<WTF::ThreadFunctionInvocation>> = {<No data fields>}, <No data fields>}, <No data fields>}, <std::_Head_base<0ul, WTF::ThreadFunctionInvocation*, false>> = {_M_head_impl = 0x7ff871dfa050}, <No data fields>}, <No data fields>}}
#6  0x00007ff8a269b6fa in start_thread (arg=0x7ff86ce1f700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7ff86ce1f700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140704955365120, 1683505151958155207, 0, 140721148175999, 140704955365824, 25465472, -1680446533540937785, -1680889570872557625}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#7  0x00007ff8a23d12dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.
.
Thread 5 (LWP 3796):
#0  0x00007ff8a23c55ad in poll () at ../sysdeps/unix/syscall-template.S:84
No locals.
#1  0x00007ff8a28fb32c in g_main_context_iterate.isra () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#2  0x00007ff8a28fb6b2 in g_main_loop_run () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007ff8a2ef9906 in gdbus_shared_thread_func () from /tmp/apport_sandbox_4UzMDi/usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
No symbol table info available.
#4  0x00007ff8a2921b75 in g_thread_proxy () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#5  0x00007ff8a269b6fa in start_thread (arg=0x7ff898d54700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7ff898d54700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140705692731136, 1683505151958155207, 0, 140705709512831, 140705692731840, 140705611707104, -1680912836529651769, -1680889570872557625}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#6  0x00007ff8a23d12dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.
.
Thread 4 (LWP 3803):
#0  0x00007ff8a23c55ad in poll () at ../sysdeps/unix/syscall-template.S:84
No locals.
#1  0x00007ff8a28fb32c in g_main_context_iterate.isra () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#2  0x00007ff8a28fb6b2 in g_main_loop_run () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007ff873a68875 in operator() (this=0x7ff86e621bc0) at /usr/include/c++/5/functional:2267
No locals.
#4  WTF::threadEntryPoint (contextData=0x7ff871df30f0) at /build/webkit2gtk-YdtF1g/webkit2gtk-2.10.9/Source/WTF/wtf/Threading.cpp:58
        context = 0x7ff871df30f0
        entryPoint = {<std::_Maybe_unary_or_binary_function<void>> = {<No data fields>}, <std::_Function_base> = {static _M_max_size = 16, static _M_max_align = 8, _M_functor = {_M_unused = {_M_object = 0x184b4c0, _M_const_object = 0x184b4c0, _M_function_pointer = 0x184b4c0, _M_member_pointer = (void (std::_Undefined_class::*)(std::_Undefined_class * const)) 0x184b4c0, this adjustment 140705069078861}, _M_pod_data = "\300\264\204\001\000\000\000\000M\031\251s\370\177\000"}, _M_manager = 0x7ff873a8ee60 <std::_Function_base::_Base_manager<WTF::WorkQueue::platformInitialize(char const*, WTF::WorkQueue::Type, WTF::WorkQueue::QOS)::<lambda()> >::_M_manager(std::_Any_data &, const std::_Any_data &, std::_Manager_operation)>}, _M_invoker = 0x7ff873a8edd0 <std::_Function_handler<void(), WTF::WorkQueue::platformInitialize(char const*, WTF::WorkQueue::Type, WTF::WorkQueue::QOS)::<lambda()> >::_M_invoke(const std::_Any_data &)>}
#5  0x00007ff873a892ca in WTF::wtfThreadEntryPoint (param=0x7ff871dfa010) at /build/webkit2gtk-YdtF1g/webkit2gtk-2.10.9/Source/WTF/wtf/ThreadingPthreads.cpp:167
        invocation = {_M_t = {<std::_Tuple_impl<0ul, WTF::ThreadFunctionInvocation*, std::default_delete<WTF::ThreadFunctionInvocation> >> = {<std::_Tuple_impl<1ul, std::default_delete<WTF::ThreadFunctionInvocation> >> = {<std::_Head_base<1ul, std::default_delete<WTF::ThreadFunctionInvocation>, true>> = {<std::default_delete<WTF::ThreadFunctionInvocation>> = {<No data fields>}, <No data fields>}, <No data fields>}, <std::_Head_base<0ul, WTF::ThreadFunctionInvocation*, false>> = {_M_head_impl = 0x7ff871dfa010}, <No data fields>}, <No data fields>}}
#6  0x00007ff8a269b6fa in start_thread (arg=0x7ff86e622700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7ff86e622700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140704980543232, 1683505151958155207, 0, 140721148176623, 140704980543936, 25465024, -1680441069805666361, -1680889570872557625}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#7  0x00007ff8a23d12dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.
.
Thread 3 (LWP 3795):
#0  0x00007ff8a23c55ad in poll () at ../sysdeps/unix/syscall-template.S:84
No locals.
#1  0x00007ff8a28fb32c in g_main_context_iterate.isra () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#2  0x00007ff8a28fb43c in g_main_context_iteration () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007ff8a28fb479 in glib_worker_main () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#4  0x00007ff8a2921b75 in g_thread_proxy () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#5  0x00007ff8a269b6fa in start_thread (arg=0x7ff899555700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7ff899555700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140705701123840, 1683505151958155207, 0, 140705709512479, 140705701124544, 0, -1680913934430666809, -1680889570872557625}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#6  0x00007ff8a23d12dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.
.
Thread 2 (LWP 3794):
#0  0x00007ff8a23c55ad in poll () at ../sysdeps/unix/syscall-template.S:84
No locals.
#1  0x00007ff8a28fb32c in g_main_context_iterate.isra () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#2  0x00007ff8a28fb43c in g_main_context_iteration () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007ff899d5e28d in ?? () from /tmp/apport_sandbox_4UzMDi/usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so
No symbol table info available.
#4  0x00007ff8a2921b75 in g_thread_proxy () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#5  0x00007ff8a269b6fa in start_thread (arg=0x7ff899d56700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7ff899d56700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140705709516544, 1683505151958155207, 0, 140721148178335, 140705709517248, 15648960, -1680915034479165497, -1680889570872557625}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#6  0x00007ff8a23d12dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.
.
Thread 1 (LWP 3793):
#0  0x00007ff8a22ff518 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
        resultvar = 0
        pid = 3793
        selftid = 3793
#1  0x00007ff8a23010ea in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x0, sa_sigaction = 0x0}, sa_mask = {__val = {0, 472446402651, 0, 0, 29583328, 139, 140705858851552, 140721148180256, 140705856255728, 0, 26680384, 0, 0, 140705853401888, 2903056, 1}}, sa_flags = 29583328, sa_restorer = 0x1c367e0}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007ff8a2920d25 in g_assertion_message () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007ff8a2920dba in g_assertion_message_expr () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#4  0x00007ff8a28e9c3e in g_hash_table_lookup () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#5  0x00007ff882a16662 in cc_appearance_xml_load_xml_internal (xml=xml@entry=0x172d3a0, filename=filename@entry=0x17c6080 "/usr/share/gnome-background-properties/xenial-wallpapers.xml", in_thread=in_thread@entry=0) at cc-appearance-xml.c:303
        flags = <optimized out>
        item = 0x19f2770
        uri = 0x17b94d0 "P\365r\001"
        cname = <optimized out>
        id = 0x1790350 "file:///usr/share/gnome-background-properties/xenial-wallpapers.xml#Ubuntu 16.04 Community Wallpapers"
        wplist = 0x1870a20
        root = <optimized out>
        list = <optimized out>
        wpa = <optimized out>
        nodelang = <optimized out>
        syslangs = 0xf22100
        i = <optimized out>
        retval = 0
#6  0x00007ff882a16adb in gnome_wp_file_changed (monitor=<optimized out>, file=<optimized out>, other_file=<optimized out>, event_type=<optimized out>, data=0x172d3a0) at cc-appearance-xml.c:337
        filename = 0x17c6080 "/usr/share/gnome-background-properties/xenial-wallpapers.xml"
        data = 0x172d3a0
        file = <optimized out>
        monitor = <optimized out>
        other_file = <optimized out>
        event_type = <optimized out>
#7  0x00007ff89df2ee40 in ffi_call_unix64 () from /tmp/apport_sandbox_4UzMDi/usr/lib/x86_64-linux-gnu/libffi.so.6
No symbol table info available.
#8  0x00007ff89df2e8ab in ffi_call () from /tmp/apport_sandbox_4UzMDi/usr/lib/x86_64-linux-gnu/libffi.so.6
No symbol table info available.
#9  0x00007ff8a2bd2cf5 in g_cclosure_marshal_generic_va () from /tmp/apport_sandbox_4UzMDi/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#10 0x00007ff8a2bd21d4 in _g_closure_invoke_va () from /tmp/apport_sandbox_4UzMDi/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#11 0x00007ff8a2bec9a6 in g_signal_emit_valist () from /tmp/apport_sandbox_4UzMDi/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#12 0x00007ff8a2bed08f in g_signal_emit () from /tmp/apport_sandbox_4UzMDi/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#13 0x00007ff8a2f13029 in g_file_monitor_source_dispatch () from /tmp/apport_sandbox_4UzMDi/usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
No symbol table info available.
#14 0x00007ff8a28fb137 in g_main_context_dispatch () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#15 0x00007ff8a28fb390 in g_main_context_iterate.isra () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#16 0x00007ff8a28fb43c in g_main_context_iteration () from /tmp/apport_sandbox_4UzMDi/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#17 0x00007ff8a2ec2ccd in g_application_run () from /tmp/apport_sandbox_4UzMDi/usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
No symbol table info available.
#18 0x0000000000407503 in main (argc=2, argv=0x7ffc320cc158) at control-center.c:317
        shell = <optimized out>
        application = 0xee7cd0
        status = <optimized out>