I get Killed by signal 15. when I'm using svn

The message you are seeing is printed by ssh as a result of the fix for svn-issue #2580.

This is expected. You need to add -q to the ssh command invoked by svn, which happens by default as of 1.6.6.

Put this in ~/.subversion/config under the [tunnels] section:

ssh = $SVN_SSH ssh -q

The correct answer is:

Add the -q parameter after  "$SVN_SSH ssh" in ~/.subversion/config

In plain English:

If your ~/.subversion/config already has such a line, then edit the line. Else add it.

So, if you are sure there is no occurrence of ssh = $SVN_SSH ssh then add a new line:

ssh = $SVN_SSH ssh -q 

If the line already exists, typically as ssh = $SVN_SSH ssh -o ControlMaster=no then edit it to read ssh = $SVN_SSH ssh -q -o ControlMaster=no

Warning: The order of the parameters seems to matter. ssh = $SVN_SSH ssh -q -o ControlMaster=no works, but ssh = $SVN_SSH ssh -o -q ControlMaster=no fails with the message command-line: line 0: Bad configuration option: -q.