http://svn.apache.org/viewvc?rev=1148424&view=rev seems related.
It hasn't been backported to 1.6.x. wrt the log message, hard to tell what happened exactly. The right output to share is 'svn pget --revprop --strict svn:log | xxd', but at a guess it's a non-UTF-8 log message. (so it would need to be recoded prior to or during the sync; new versions of svnsync can do that during the sync.) Jozef Izso wrote on Sat, Aug 27, 2011 at 14:10:01 +0200: > Hello, > > I'm trying to synchronize a repository from the svn server running version > 1.4.6 (r28521). > The svnsync sync stops on a revision that has strange Unicode characters in > the commit message and displays the "Unknown command 'failure'" message. > The svn log command shows this commit message for that revision: > > Text: ?\131?\196(EOT)[]?\195?\141v > Hex: 3f 5c 31 33 31 3f 5c 31 39 36 04 5b 5d 3f 5c 31 39 35 3f 5c 31 34 31 76 > > The (EOT) in the message is the End-of-tape character, ASCII 04. > > If I save the log as XML, this characters are saved: > > <msg>Ä?\004[]ĂŤv</msg> > c4 3f 5c 30 30 34 5b 5d c3 8d 76 > > > These are the version of the tools used: > > svnsync, version 1.6.17 (r1128011) > compiled May 30 2011, 14:52:54 > > svnserve, version 1.4.6 (r28521) > compiled Dec 20 2007, 16:33:06 > > > Is there a way to get this revision synced to the mirror repository? > > > Best regards, > Jozef Izso.