From: Trond Myklebust <trond.myklebust@fys.uio.no>
Subject: Re: executables crash when moved
Date: Wed, 15 Feb 2006 14:31:55 -0500
Message-ID: <1140031915.7888.35.camel@lade.trondhjem.org>
References: <43F36BD6.7010408@bnl.gov>
Mime-Version: 1.0
Content-Type: text/plain
Cc: nfs@lists.sourceforge.net
To: Sev Binello <sev@bnl.gov>
In-Reply-To: <43F36BD6.7010408@bnl.gov>
Sender: nfs-admin@lists.sourceforge.net
Errors-To: nfs-admin@lists.sourceforge.net

On Wed, 2006-02-15 at 12:58 -0500, Sev Binello wrote:
> We have had a consistent problem of executables shared over NFS crashing
> when new executables are released.
> 
>     Before a new executable replaces an older one with a cp,
>     we mv the executable to a fallback dir and rename it.
>     We have 2 renaming schemes,
>     either .old, .older, .oldest or  append a date to the old executable.
>    
>     This used to work fine when the nfs sever was solaris,
>     however since we migrated it to redhat linux WS,
>     we find that the executables crash with a SIGBUS.
>    
>     The executables don't necessarily crash right away,
>     as a matter of fact we can't intentionally reproduce the crash.
>     Which leads me to believe it is cache related.

It isn't. It is a consequence of using the (admittedly _very_ stupid)
default server setting of "subtree_check", and then renaming into a
different directory (man 5 exports).

You have one of 2 possible solutions:

 1) Edit your /etc/exports, and add no_subtree_check options to the
entries for your exported filesystem.

OR

 2) rename the executables into the same directory.

Cheers,
  Trond


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