Oops…

SubversionException: ("Can't open file '/var/subversion/db/revprops/17172': Too many open files", 24)

There was an internal error in Trac. It is recommended that you notify your local Trac administrator with the information needed to reproduce the issue.

To that end, you coulda ticket.

The action that triggered the error was:

GET: /changeset/17410/branches/7.1

TracGuide — The Trac User and Administration Guide