This also happens here. I can reliable reproduce it by first executing an authentication event (e.g. by "pkexec echo test") and then logging out. This results in the attached backtrace.
Application: PolicyKit1-KDE (polkit-kde-authentication-agent-1), signal: Bus error [Current thread is 1 (Thread 0x7fba659f5800 (LWP 2096))] Thread 3 (Thread 0x7fba54e4c710 (LWP 2102)): #0 0x00007fba629c2113 in poll () from /lib/libc.so.6 #1 0x00007fba608c6789 in ?? () from /lib/libglib-2.0.so.0 #2 0x00007fba608c6f35 in g_main_loop_run () from /lib/libglib-2.0.so.0 #3 0x00007fba61483024 in ?? () from /usr/lib/libgio-2.0.so.0 #4 0x00007fba608ec124 in ?? () from /lib/libglib-2.0.so.0 #5 0x00007fba5fadf8ba in start_thread () from /lib/libpthread.so.0 #6 0x00007fba629cd02d in clone () from /lib/libc.so.6 #7 0x0000000000000000 in ?? () Thread 2 (Thread 0x7fba4fcc9710 (LWP 2308)): #0 0x00007fba629c0ebd in read () from /lib/libc.so.6 #1 0x00007fba608c39bb in ?? () from /lib/libglib-2.0.so.0 #2 0x00007fba608ec124 in ?? () from /lib/libglib-2.0.so.0 #3 0x00007fba5fadf8ba in start_thread () from /lib/libpthread.so.0 #4 0x00007fba629cd02d in clone () from /lib/libc.so.6 #5 0x0000000000000000 in ?? () Thread 1 (Thread 0x7fba659f5800 (LWP 2096)): [KCrash Handler] #6 0x00007fba608aad6e in g_datalist_id_set_data_full () from /lib/libglib-2.0.so.0 #7 0x00007fba611857da in g_object_unref () from /usr/lib/libgobject-2.0.so.0 #8 0x00007fba64f9fc51 in PolkitQt1::Agent::Listener::~Listener (this=0x17c3640, __in_chrg=<value optimized out>) at /tmp/buildd/polkit-qt-1-0.95.1/agent/polkitqt1-agent-listener.cpp:69 #9 0x0000000000408933 in PolicyKitListener::~PolicyKitListener (this=0x17c3640, __in_chrg=<value optimized out>) at /tmp/buildd/polkit-kde-1-0.95.1/agent/policykitlistener.cpp:42 #10 0x00007fba6451acef in QObjectPrivate::deleteChildren (this=0x167a150) at kernel/qobject.cpp:1949 #11 0x00007fba64522aeb in QObject::~QObject (this=<value optimized out>, __in_chrg=<value optimized out>) at kernel/qobject.cpp:945 #12 0x00007fba636155df in QApplication::~QApplication (this=0x7fffd64bea60, __in_chrg=<value optimized out>) at kernel/qapplication.cpp:1195 #13 0x00000000004082d9 in PolicyKitKDE::~PolicyKitKDE (this=0x7fffd64bea60, __in_chrg=<value optimized out>) at /tmp/buildd/polkit-kde-1-0.95.1/agent/policykitkde.cpp:47 #14 0x0000000000409db9 in main (argc=3, argv=0x7fffd64bec88) at /tmp/buildd/polkit-kde-1-0.95.1/agent/main.cpp:42
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