Opening http://trac.sagemath.org/ticket/15123 gives
Trac detected an internal error:
CalledProcessError: Command '['git',
u'--git-dir=/srv/git/repositories/sage.git', 'merge-base',
'3472a854df051b57d1cb7e4934913f17f1fef820',
'72c453830846583dbfdf2cae224df776ef38ea26']' returned non-zero exit status 1
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