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Re: Bug: apache/mod_svn intermittently creates transaction dirs with incorrect permissions or ownership such that the transaction breaks.

From: Michael Sinz <Michael.Sinz_at_sinz.org>
Date: 2005-09-17 12:57:34 CEST

John Duprey wrote:
> I'm about to file a subversion bug in relation to apache/mod_svn
> intermittently creating transaction dirs with incorrect permissions or
> ownership such that the transaction breaks.
>
> Many times during the day commits are failing with an error message like
> the following:
>
> /[Wed Aug 31 12:55:55 2005] [error] [client 192.189.224.121
> <http://192.189.224.121><http://192.189.224.121
> <http://192.189.224.121/>>] /
> /Could not create activity /
> //svn/ResultsPlus/!svn/act/a24ba835-0155-2042-a734-13818c448007. [500,
> #0] /
> /[Wed Aug 31 12:55:55 2005] [error] [client 192.189.224.121
> <http://192.189.224.121><http://192.189.224.121
> <http://192.189.224.121/>>] /
> /could not begin a transaction [500, #13] /
> /[Wed Aug 31 12:55:55 2005] [error] [client 192.189.224.121
> <http://192.189.224.121><http://192.189.224.121
> <http://192.189.224.121/>>] /
> /Can't open file
> '/svnroot/repos/ResultsPlus/db/transactions/90-1.txn/node.0.0': /
> /Permission denied [500, #13]
> /
> Inspection on the server side reveals one of 2 scenarios:
>
> 1. The transaction directory (e.g.
> /svnroot/repos/reposname/db/transactions/90-1.txn) has the wrong
> permissions and cannot be populated by the apache user (apache) -
> i.e. drw-rwSrw-
> 2. The props file in the transaction directory (e.g.
> /svnroot/repos/reposname/db/transactions/90-1.txn/props) is owned
> by the root user and ONLY user has write permissions
>
> If the commit is retried, it may or may not succeed. To temporarily fix
> the problem, I must restart apache, and delete the broken transaction
> directories.
>
> I am now running the latest stable apache(httpd-2.0.54) and
> subversion(subversion-1.2.3) built from scratch. (This problem was
> first observed with prebuilt RPMS.) I am running Intel RedHat
> Enterprise Server 3 (rhel-3). I have audited the system extensively in
> an effort to identify any external processes that could be causing this
> problem and found now.
>
> I have a little bash script that will repeatedly modify, commit, and
> sleep 1 second that tests subversion. I can reproduce this error within
> 10 - 30 commits. I posted this problem before

Could you please send the script - I wrote my own "bash the server hard"
script and other than finding an annoying behavior of "svn mkdir" it has
yet to show a problem. (I only did 9000 or so revisions with it, many in
parallel, and no problems) All over HTTP/DAV

PS - here is the script I ran - it is *very* crude but it did the job...

PPS - once I get some time, I will investigate the svn mkdir problem - basically,
it fails sometimes but not because of the directory already existing but with
a message that says that "." is out of date - which can not be true since I
have not even checked anything out yet...

-- 
Michael Sinz                     Technology and Engineering Director/Consultant
"Starting Startups"                                mailto:michael.sinz@sinz.org
My place on the web                            http://www.sinz.org/Michael.Sinz


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Received on Sat Sep 17 13:00:26 2005

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