This happens in i386 only. Not in amd64. bugs@sid-reportbug:/cores$ uname -a Linux sid-reportbug 4.7.0-1-686-pae #1 SMP Debian 4.7.2-1 (2016-08-28) i686 GNU/Linux
bugs@sid-reportbug:/cores$ gdb /usr/bin/rhythmbox /cores/core.rhythmbox.2444 GNU gdb (Debian 7.11.1-2) 7.11.1 .. .. Reading symbols from /usr/bin/rhythmbox...Reading symbols from /usr/lib/debug/.build-id/dd/26a5bd23cb7bb34ba548b8f6f6e94b2a124109.debug...done. done. [New LWP 2444] [New LWP 2445] [New LWP 2446] [New LWP 2448] [New LWP 2466] [New LWP 2625] [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1". btCore was generated by `rhythmbox'. Program terminated with signal SIGABRT, Aborted. #0 0xb775dd5d in ?? () [Current thread is 1 (Thread 0xb2f8b500 (LWP 2444))] (gdb) bt Python Exception <class 'SystemError'> <built-in function isinstance> returned a result with an error set: #0 0xffffffff in #1 0x00000000 in () (gdb) q