Just watched https://www.youtube.com/watch?v=NbHL0SYlrSQ "How We Created the First SHA 1 Collision"
#svn got a dedicated slide in this talk, thanks :)
The version of events given in this talk is of course a bit simplified. There wasn't what one would normally call a "crash".
The error handling was robust and worked as designed.
For the full SVN #SHA1 story, see http://subversion.apache.org/security/sha1-advisory.txt