svn and svnserve hanging

I've run a "svn diff" with the -c option, and it is hanging.
The corresponding "svnserve -t" on the server is hanging too.

After one hour, on the client side, the svn command is still running,
together with

vinc17 19550 19549 0 12:40 pts/11 00:00:00 zsh /home/vinc17/scripts/ssh gforge svnserve -t
vinc17 19565 19550 0 12:40 pts/11 00:00:00 ssh -F /home/vinc17/.ssh/config -C gforge svnserve -t

and on the server side:

root 48651 878 0 12:39 ? 00:00:00 sshd: vlefevre [priv]
vlefevre 48655 48651 0 12:39 ? 00:00:00 sshd: vlefevre_at_notty
vlefevre 48724 48655 0 12:40 ? 00:00:00 svnserve -t

Such an issue occurs from time to time.

Version on the client side:

svn, version 1.10.4 (r1850624)
   compiled Jan 23 2019, 03:41:34 on x86_64-pc-linux-gnu

Version on the server side:

svnserve, version 1.8.10 (r1615264)
   compiled May 21 2018, 00:10:07 on x86_64-pc-linux-gnu

A search on the web shows many reports about hanging svn.

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)