Description of problem:
Building versions 1.5.3.3 or 1.5.4 of git with mock from either F8 or F9 causes
mock to consume all free memory and start the system thrashing. This happens
when building git's docs; passing the RPM macro '_without_docs 1' allows you to
bypass the problem. Note that a vanilla rpmbuild does not have this problem.

Presumably older versions of mock were able to build git, however I have not yet
tried to track down a version that works.

Version-Release number of selected component (if applicable):
mock-0.8.19
mock-0.9.7

How reproducible:
Every time on x86_64. Note however that the PPC builds on koji completed:
http://koji.fedoraproject.org/koji/taskinfo?taskID=393542

Steps to Reproduce:
run mock on a git source rpm.
  
Actual results:
mock consumes all memory

Expected results:
The build completes successfully, using a reasonable amount of system resources.

Additional info: