git push fails with the following error.

remote: Traceback (most recent call last):
remote: File "/opt/python/domains/bitbucket.org/current/bitbucket/scripts/git/hooks/pre-receive", line 12, in <module>
remote: sys.exit(prehooks.githooks())
remote: File "/opt/python/domains/bitbucket.org/current/bitbucket/local/env/lib/python2.7/site-packages/orochi/git.py", line 1309, in wrapper
remote: newcsets[refname] = repo._reachable(newsha, oldshas -

{newsha}

)
remote: File "/opt/python/domains/bitbucket.org/current/bitbucket/local/env/lib/python2.7/site-packages/orochi/git.py", line 1110, in _reachable
remote: self._gitcmd(args, retcodes=[0, 128]).splitlines()]
remote: File "/opt/python/domains/bitbucket.org/current/bitbucket/local/env/lib/python2.7/site-packages/orochi/git.py", line 942, in _gitcmd
remote: retcode, out, err = execute(cmd, env=subenv, cwd=cwd)
remote: File "/opt/python/domains/bitbucket.org/current/bitbucket/local/env/lib/python2.7/site-packages/orochi/process.py", line 17, in execute
remote: **kwargs)
remote: File "/opt/python/2.7.3/lib/python2.7/subprocess.py", line 679, in init
remote: errread, errwrite)
remote: File "/opt/python/2.7.3/lib/python2.7/subprocess.py", line 1143, in _execute_child
remote: self.pid = os.fork()
remote: OSError: [Errno 12] Cannot allocate memory

Full log attached