I think the change to the dump-post.pl script in http://trac.webkit.org/changeset/80428 caused the breakage:
I am not sure what the right thing is to do here, but if this stays unaddressed for too long I will just commit the failing results or roll-out the change.
The patch was rolled out here: http://trac.webkit.org/changeset/80430 Sorry for the mess. Looks like there is some incompatibility here. I'll try to find a method that works on both Snow Leopard and my version of Linux on Monday.
*** This bug has been marked as a duplicate of bug 55833 ***