svn freezing at checkout on FreeBSD

Hello, all.

On FreeBSD 14.3, svn 1.14.2 freezes at the checkout operation of an
svn:// repository. The working-directory is created together with the
.svn subdirectory, but nothing else appears. If I kill the fronzen
svn process, and do `svn up', it says the working copy is already locked.
If I do `svn cleanup', then `svn up' hangs forever as well.

I have made sure that both /dev/random and /dev/urandom do not
block, by reading a single byte from them:

  od -vAn -N2 -tu2 < /dev/random
  od -vAn -N2 -tu2 < /dev/urandom

On FreeBSD, /dev/urandom is a symlink to /dev/random, but it
did not stop other and previous installation of FreeBSD.
Please, help me shoot this trouble, preferable in the head
rather than in the foot.