test_gdb.py fails when builddir != srcdir: the regex tries to match lines like this: #0 builtin_id (self=<module at remote 0x7ffff20d3240>, v=()) at ../Python/bltinmodule.c:919 but isn't expecting the "../" before the "Python/bltinmodule.c" 2.7 uses a different regexp, and I don't think it's affected by an analogous problem.
Looks like Mark ment Mercurial revision number 77824, corresponding to abcd29c9a791 (the link assumes Subversion). I think it made it into 3.3 but not 3.2 nor 2.7, so I am closing this.