Comment 2 for bug 1198375

StacktraceTop:
 sem_post () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_post.S:33
 PyThread_release_lock () from /tmp/apport_sandbox_V_hYLJ/usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
 pygi_signal_closure_marshal (closure=0x20772b0, return_value=0x7f0fa37fbe80, n_param_values=3, param_values=0x7f0fa37fbf30, invocation_hint=<optimized out>, marshal_data=<optimized out>) at ../../gi/pygi-signal-closure.c:171
 g_closure_invoke (closure=0x20772b0, return_value=0x7f0fa37fbe80, n_param_values=3, param_values=0x7f0fa37fbf30, invocation_hint=0x7f0fa37fbed0) at /build/buildd/glib2.0-2.37.3/./gobject/gclosure.c:777
 signal_emit_unlocked_R (node=node@entry=0x16f3230, detail=detail@entry=0, instance=instance@entry=0x16ec610, emission_return=emission_return@entry=0x7f0fa37fc020, instance_and_params=instance_and_params@entry=0x7f0fa37fbf30) at /build/buildd/glib2.0-2.37.3/./gobject/gsignal.c:3582