Back to bzr-svn, here’s a backtrace: tglase@tglase-nb:~/Evolvis/tarent-5.1 $ gdb --args python /usr/bin/bzr push --remember svn+ssh://mirabilos@evol> GNU gdb (GDB) 7.4.1-debian Copyright (C) 2012 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". For bug reporting instructions, please see: ... Reading symbols from /usr/bin/python...Reading symbols from /usr/lib/debug/usr/bin/python2.7...done. done. (gdb) b PyErr_NewSubversionException Function "PyErr_NewSubversionException" not defined. Make breakpoint pending on future shared library load? (y or [n]) y Breakpoint 1 (PyErr_NewSubversionException) pending. (gdb) r Starting program: /usr/bin/python /usr/bin/bzr push --remember svn+ssh://