. Thread 3 (LWP 29451): #0 0x00007f03f00823cd in poll () at ../sysdeps/unix/syscall-template.S:81 No locals. #1 0x00007f03f08fd394 in g_main_context_poll (priority=2147483647, n_fds=3, fds=0x7f03dc0010c0, timeout=-1, context=0x7f03e4011d10) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:3999 poll_func = 0x7f03f090c030 #2 g_main_context_iterate (context=0x7f03e4011d10, block=block@entry=1, dispatch=dispatch@entry=1, self=) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:3700 max_priority = 2147483647 timeout = -1 some_ready = nfds = 3 allocated_nfds = 3 fds = 0x7f03dc0010c0 #3 0x00007f03f08fd7fa in g_main_loop_run (loop=0x7f03e4011ca0) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:3899 __PRETTY_FUNCTION__ = "g_main_loop_run" #4 0x00007f03f0ed85f6 in gdbus_shared_thread_func (user_data=0x7f03e4011ce0) at /build/buildd/glib2.0-2.37.3/./gio/gdbusprivate.c:278 data = 0x7f03e4011ce0 #5 0x00007f03f0921c25 in g_thread_proxy (data=0x7f03f3053590) at /build/buildd/glib2.0-2.37.3/./glib/gthread.c:798 thread = 0x7f03f3053590 #6 0x00007f03f0364f8e in start_thread (arg=0x7f03e8ba1700) at pthread_create.c:311 __res = pd = 0x7f03e8ba1700 now = unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139654766139136, 2160147870715827719, 0, 139654929653856, 139654774528224, 4096, -2018260798510115321, -2018312576383101433}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}} not_first_call = 0 pagesize_m1 = sp = freesize = __PRETTY_FUNCTION__ = "start_thread" #7 0x00007f03f008ee1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113 No locals. . Thread 2 (LWP 29450): #0 0x00007f03f00823cd in poll () at ../sysdeps/unix/syscall-template.S:81 No locals. #1 0x00007f03f08fd394 in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7f03e40010e0, timeout=-1, context=0x7f03f304acc0) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:3999 poll_func = 0x7f03f090c030 #2 g_main_context_iterate (context=context@entry=0x7f03f304acc0, block=block@entry=1, dispatch=dispatch@entry=1, self=) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:3700 max_priority = 2147483647 timeout = -1 some_ready = nfds = 1 allocated_nfds = 1 fds = 0x7f03e40010e0 #3 0x00007f03f08fd49c in g_main_context_iteration (context=0x7f03f304acc0, may_block=1) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:3766 retval = #4 0x00007f03e93a9a1d in ?? () from /tmp/apport_sandbox_6Xozqc/usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so No symbol table info available. #5 0x00007f03f0921c25 in g_thread_proxy (data=0x7f03f3002c00) at /build/buildd/glib2.0-2.37.3/./glib/gthread.c:798 thread = 0x7f03f3002c00 #6 0x00007f03f0364f8e in start_thread (arg=0x7f03e93a2700) at pthread_create.c:311 __res = pd = 0x7f03e93a2700 now = unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139654774531840, 2160147870715827719, 0, 139654929653856, 140735435722352, 4096, -2018261898558614009, -2018312576383101433}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}} not_first_call = 0 pagesize_m1 = sp = freesize = __PRETTY_FUNCTION__ = "start_thread" #7 0x00007f03f008ee1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113 No locals. . Thread 1 (LWP 29448): #0 0x00007f03e00d89a4 in update_input_peak (dialog=0x7f03f35f2440, v=) at gvc-mixer-dialog.c:220 adj = #1 0x00007f03e00d8aae in update_input_meter (source_index=, sink_input_idx=, v=0.0058290353044867516, dialog=0x7f03f35f2440) at gvc-mixer-dialog.c:242 No locals. #2 on_monitor_read_callback (s=0x7f03f36931f0, length=4, userdata=0x7f03f35f2440) at gvc-mixer-dialog.c:292 dialog = 0x7f03f35f2440 data = 0x7f03a1630040 v = 0.0058290353044867516 __PRETTY_FUNCTION__ = "on_monitor_read_callback" #3 0x00007f03d90c0c8b in pstream_memblock_callback (p=, channel=, offset=0, seek=PA_SEEK_RELATIVE, chunk=0x7fff85a756a0, userdata=0x7f03f35af950) at pulse/context.c:365 l = c = s = 0x7f03f36931f0 __func__ = "pstream_memblock_callback" __PRETTY_FUNCTION__ = "pstream_memblock_callback" #4 0x00007f03d8e84eab in do_read (p=0x7f03f35af3a0) at pulsecore/pstream.c:847 offset = chunk = {memblock = 0x7f03f313af70, index = 0, length = 4} b = 0x7f03f313af70 release_memblock = 0x0 d = l = r = #5 do_something (p=0x7f03f35af3a0) at pulsecore/pstream.c:180 __func__ = "do_something" __PRETTY_FUNCTION__ = "do_something" #6 0x00007f03d92fdb47 in dispatch_func (source=source@entry=0x7f03f35aa9b0, callback=, userdata=) at pulse/glib-mainloop.c:584 g = 0x7f03f35aa9b0 e = 0x7f03f3429e90 __PRETTY_FUNCTION__ = "dispatch_func" #7 0x00007f03f08fd0a6 in g_main_dispatch (context=0x7f03f3014780) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:3058 dispatch = 0x7f03d92fd9e0 was_in_call = 0 user_data = 0x0 callback = 0x0 cb_funcs = 0x0 cb_data = 0x0 need_destroy = current_source_link = {data = 0x7f03f35aa9b0, next = 0x0} source = 0x7f03f35aa9b0 current = 0x7f03f3060120 i = 1 #8 g_main_context_dispatch (context=context@entry=0x7f03f3014780) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:3634 No locals. #9 0x00007f03f08fd3f8 in g_main_context_iterate (context=context@entry=0x7f03f3014780, block=block@entry=1, dispatch=dispatch@entry=1, self=) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:3705 max_priority = 0 timeout = 0 some_ready = 1 nfds = allocated_nfds = 5 fds = 0x7f03f34dc9c0 #10 0x00007f03f08fd49c in g_main_context_iteration (context=0x7f03f3014780, context@entry=0x0, may_block=may_block@entry=1) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:3766 retval = #11 0x00007f03f0ea5a1c in g_application_run (application=0x7f03f320d430, argc=argc@entry=2, argv=argv@entry=0x7fff85a759a8) at /build/buildd/glib2.0-2.37.3/./gio/gapplication.c:1635 arguments = 0x7f03f31df640 status = 0 i = __PRETTY_FUNCTION__ = "g_application_run" #12 0x00007f03f279b25a in main (argc=2, argv=0x7fff85a759a8) at control-center.c:263 shell = application = 0x7f03f320d430 status =