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From Vincent Lefevre <vincent-...@vinc17.net>
Subject Re: svn and svnserve hanging
Date Mon, 08 Apr 2019 12:38:15 GMT
On 2019-04-08 13:57:32 +0200, Stefan Sperling wrote:
> There is insufficient information in your report for anyone to act upon.
> Most importantly, it is unclear which component in the chain is causing
> the problem. Is it SVN? Is it SSH? Is it TCP?
> Please try to find answers to these questions.

I'm using SSH connection sharing and the master (started at 12:39,
i.e. the same master as with the hanging svn) is still working.

> You could use strace to figure out which system call programs are
> sleeping in, e.g.: strace -p 48724

Unfortunately strace is not installed on the server.

Concerning the svn client, that's

strace: Process 19549 attached
read(6,

and for the SSH client:

strace: Process 19565 attached
restart_syscall(<... resuming interrupted restart_syscall ...>

> You could try to get some information out of SSH? Perhaps the sshd
> server logs contain clues?

I've asked the sysadmin, but since the SSH master still works,
I doubt that this would be related.

> On the client side you can do this: export SVN_SSH='ssh -q -vvv --'
> and try to reproduce the problem. Maybe the SSH client will print
> something useful when the problem occurs?

I don't know how to reproduce the problem. The master is already
started with -vvv, but there are no dates. However, I don't see
anything suspicious.

After doing a SSH connection via the master and quitting, I get
concerning the status:

debug3: channel 3: status: The following connections are open:
  #1 mux-control (t16 r2 i0/0 o0/0 e[closed]/0 fd 6/6/-1 sock 6 cc -1)
  #2 client-session (t4 r0 i0/0 o0/0 e[write]/0 fd 7/8/9 sock -1 cc 1)
  #3 mux-control (t16 nr0 i3/0 o3/0 e[closed]/0 fd 10/10/-1 sock 10 cc -1)

#2 can only be the session of the hanging svn.

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

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