Pidgin froze. I attached gdb to it and got the following stacktrace:
(gdb) bt
#0 0x00007fbf081013cd in poll () at ../sysdeps/unix/syscall-template.S:81
#1 0x00007fbf08c7a1dc in g_main_context_poll (n_fds=1, fds=0x7fbf0e2d0100, timeout=-1, context=0x7fbf0d6ba490, priority=<optimized out>) at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3995
#2 g_main_context_iterate (context=0x7fbf0d6ba490, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3696
#3 0x00007fbf08c7a6ba in g_main_loop_run (loop=0x7fbf0e2d5a90) at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3895
#4 0x00007fbf08cbbe41 in g_spawn_sync (working_directory=working_directory@entry=0x0, argv=<optimized out>, envp=envp@entry=0x0, flags=flags@entry=G_SPAWN_SEARCH_PATH,
child_setup=child_setup@entry=0x0, user_data=user_data@entry=0x0, standard_output=standard_output@entry=0x7fff8d6b7498, standard_error=standard_error@entry=0x0,
exit_status=exit_status@entry=0x0, error=error@entry=0x0) at /build/buildd/glib2.0-2.36.0/./glib/gspawn.c:434
#5 0x00007fbf08cbc2b8 in g_spawn_command_line_sync (command_line=<optimized out>, standard_output=0x7fff8d6b7498, standard_error=0x0, exit_status=0x0, error=0x0)
at /build/buildd/glib2.0-2.36.0/./glib/gspawn.c:735
#6 0x00007fbef4edd184 in Oxygen::QtSettings::kdeConfigPathList() const () from /usr/lib/x86_64-linux-gnu/gtk-2.0/2.10.0/engines/liboxygen-gtk.so
#7 0x00007fbef4edfca7 in Oxygen::QtSettings::initialize(unsigned int) () from /usr/lib/x86_64-linux-gnu/gtk-2.0/2.10.0/engines/liboxygen-gtk.so
#8 0x00007fbef4ef1485 in Oxygen::Style::initialize(unsigned int) () from /usr/lib/x86_64-linux-gnu/gtk-2.0/2.10.0/engines/liboxygen-gtk.so
#9 0x00007fbef4ef17f1 in Oxygen::Style::fileChanged(_GFileMonitor*, _GFile*, _GFile*, GFileMonitorEvent, void*) () from /usr/lib/x86_64-linux-gnu/gtk-2.0/2.10.0/engines/liboxygen-gtk.so
#10 0x00007fbf044eec18 in ffi_call_unix64 () from /usr/lib/x86_64-linux-gnu/libffi.so.6
#11 0x00007fbf044ee580 in ffi_call () from /usr/lib/x86_64-linux-gnu/libffi.so.6
#12 0x00007fbf08f3e60b in g_cclosure_marshal_generic_va (closure=0x7fbf0d722990, return_value=0x0, instance=0x7fbf0d5ff200, args_list=<optimized out>,
marshal_data=0x7fbef4ef17e0 <Oxygen::Style::fileChanged(_GFileMonitor*, _GFile*, _GFile*, GFileMonitorEvent, void*)>, n_params=3, param_types=0x7fbf0d6cc900)
at /build/buildd/glib2.0-2.36.0/./gobject/gclosure.c:1550
#13 0x00007fbf08f3d8e7 in _g_closure_invoke_va (closure=0x7fbf0d722990, return_value=0x0, instance=0x7fbf0d5ff200, args=0x7fff8d6b7c18, n_params=3, param_types=0x7fbf0d6cc900)
at /build/buildd/glib2.0-2.36.0/./gobject/gclosure.c:840
#14 0x00007fbf08f562df in g_signal_emit_valist (instance=0x7fbf0d5ff200, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7fff8d6b7c18)
at /build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3234
#15 0x00007fbf08f56f92 in g_signal_emit (instance=instance@entry=0x7fbf0d5ff200, signal_id=<optimized out>, detail=detail@entry=0) at /build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3384
#16 0x00007fbf06747871 in emit_cb (data=0x7fbf0d5ff200) at /build/buildd/glib2.0-2.36.0/./gio/gfilemonitor.c:396
#17 0x00007fbf08c79f05 in g_main_dispatch (context=0x7fbf0d5cc320) at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3054
#18 g_main_context_dispatch (context=context@entry=0x7fbf0d5cc320) at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3630
#19 0x00007fbf08c7a248 in g_main_context_iterate (context=0x7fbf0d5cc320, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>)
at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3701
#20 0x00007fbf08c7a6ba in g_main_loop_run (loop=0x7fbf0e2f92b0) at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3895
#21 0x00007fbf09ef2fe7 in gtk_main () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#22 0x00007fbf0b8ee419 in main (argc=1, argv=0x7fff8d6ba2d8) at /build/buildd/pidgin-2.10.7/./pidgin/gtkmain.c:933
Here's the process that was launched by pidgin:
$ ps 14001
PID TTY STAT TIME COMMAND
14001 ? Z 0:00 [kde4-config] <defunct>
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: pidgin 1:2.10.7-0ubuntu4
ProcVersionSignature: Ubuntu 3.8.0-18.28-generic 3.8.6
Uname: Linux 3.8.0-18-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
Date: Tue Apr 16 13:46:10 2013
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-04-05 (11 days ago)
InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.1)
MarkForUpload: True
SourcePackage: pidgin
UpgradeStatus: Upgraded to raring on 2013-04-12 (3 days ago)
It happens all the time, too.