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From Vincent Lefevre <vincent-...@vinc17.net>
Subject Re: svn and svnserve hanging
Date Mon, 08 Apr 2019 14:21:37 GMT
On 2019-04-08 15:26:15 +0200, Stefan Sperling wrote:
> On Mon, Apr 08, 2019 at 02:38:15PM +0200, Vincent Lefevre wrote:
> > 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.
> 
> Interesting. Does the problem also occur if you disable SSH
> connection sharing completely? Perhaps it is related?

This problem occurs not often enough to know (except by doing
background tests in a loop).

> > > 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.
> 
> How can you know that? My and your guesses are only as good as any
> other guesses. Until more information is surfaced which pins things
> down further we simply don't know anything at all about this problem.

If sshd would have detected an issue on its side, I would have
got some information on the client side, unless there is a bug
in the error reporting of openssh. On the client side, svn is
still hanging with no output, and no errors on the master ssh
debug output.

Still no answer for the sysadmin.

I can have lsof information on the server, in case this can provide
useful information:

* for sshd:
COMMAND     PID   TID            USER   FD      TYPE DEVICE SIZE/OFF      NODE NAME
sshd      48655              vlefevre  cwd   unknown                           /proc/48655/cwd
(readlink: Permission denied)
sshd      48655              vlefevre  rtd   unknown                           /proc/48655/root
(readlink: Permission denied)
sshd      48655              vlefevre  txt   unknown                           /proc/48655/exe
(readlink: Permission denied)
sshd      48655              vlefevre NOFD                                     /proc/48655/fd
(opendir: Permission denied)

* for svnserve:
COMMAND     PID   TID            USER   FD      TYPE DEVICE SIZE/OFF      NODE NAME
svnserve  48724              vlefevre  cwd       DIR   0,32     4096 110673531 /home/users/vlefevre
(...:/forge_home)
svnserve  48724              vlefevre  rtd       DIR  254,0     4096         2 /
svnserve  48724              vlefevre  txt       REG  254,0    86256      9413 /usr/bin/svnserve
svnserve  48724              vlefevre    0r     FIFO    0,8      0t0 957950313 pipe
svnserve  48724              vlefevre    1w     FIFO    0,8      0t0 957950314 pipe
svnserve  48724              vlefevre    2w     FIFO    0,8      0t0 957950315 pipe
svnserve  48724              vlefevre    3r      CHR    1,9      0t0      7109 /dev/urandom

(I've excluded the library files).

-- 
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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