SVN: PROPFIND request failed - No Such Revision

One of my Subversion repositories got corrupted today and every single operation started failing, returning an error message: PROPFIND request failed on '/path/to/repo/ No Such Revision 296.

After researching for an hour I could not find anything, nada, nothing at all ... I found a few posts on dumping the data, creating a new repo, importing again ... but like I said, every operation on the repo failed... I couldn't even try those options.

So I chose to backup the repository's file system and fix it myself... I noticed that the error claimed that revision 296 did not exist and indeed, when I opened the db/revs folder it only went up to 295. With a completely wild guess, I opened the /current file and noticed that it had the 296 revision number on it, so I assumed this is the pointer to the latest revision, but the data never made it to the server... I modified the number to 295 and everything immediately started working.

Again, it was a wild guess, but it worked ... Hope this saves someone a few hours.

update: I think I found out how it broke. Someone committed a file that Nod32 caught with a virus; SVN increased the repo version, updated the indexes, and then the antivirus deleted the data...