git-svn goes into infinite loop rebuilding rev_map

Starting last night, for no particularly obvious reason, git-svn fetch (or git-svn rebase or any command that does naything interesting) on gcc.gnu.org's repo causes git-svn to do the following:

-bash-3.00$ git-svn fetch Rebuilding .git/svn/trunk/.rev_map.138bc75d-0d04-0410-961f-82ee72b054a4 ... Done rebuilding .git/svn/trunk/.rev_map.138bc75d-0d04-0410-961f-82ee72b054a4 Rebuilding .git/svn/trunk/.rev_map.138bc75d-0d04-0410-961f-82ee72b054a4 ... <repeat forever>

I checked the obvious things. There is no permissions problem, strace doesn't show the writes failing, etc. git-fsck shows nothing as being obviously wrong.

This just suddenly started happening with no obvious reason (we fire off git-svn fetch and rebase on the repo when cvs commits happen).

git-log shows the last processed rev was:

commit e66b310fb9a3ddc7ed5143db3c468711c8a36d08
Author: uros <uros@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Thu May 15 14:38:23 2008 +0000

        * config/i386/sse.md (*vec_concatv2sf_sse4_1): Add "m" constraint
        to alternative 4 of operand 2.

    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@135364
138bc75d-0d04-0410-961f-82ee72b054a4

I'm happy to provide anything i can to get the problem fixed, but not being a git expert, i have no idea what is up here.