Bug: git bus error (stack blowout)

Hi,

When using git 1.7.6.3 from NetBSD's pkgsrc, on this git tree: http://gitweb.dragonflybsd.org/pkgsrcv2.git, I got a bus error when switching from the pkgsrc-2011q3 branch to the master branch. I have a core file and the git binary if it'd be helpful; it looks like mark_parents_uninteresting() was called recursively entirely too many times (>60,000), originally from prepare_revision_walk(), from stat_tracking_info(), from format_tracking_info(), update_revs_for_switch(), from cmd_checkout().

Thanks, -- vs;