On Thu, Jun 23, 2011 at 15:27, Zaccone, Warren <wzacc...@telcordia.com> wrote:
> We recently started experiencing a problem on our server (httpd 2.2.19, PHP 
> 5.3.6) where all of the apache child processes hang in PHP code and no longer 
> process requests.
>  I  am running Apache as prefork on Solaris 10 with 256 children, and found 
> that within a few minutes all 256 httpd child processes are stuck, and it's 
> always in the same place within php_session_start in a php_flock call.   
> Stack trace is shown below.
> The file it is trying to flock is  
> /var/tmp/sess_2e39aabaf226819b67f29da477892e91.

    May want to consider fsck'ing that drive, Warren.  You may have
some bad clusters that are causing disk I/O issues.  Just one of many
possibilities, of course, but the least favorite of all, obviously.

</Daniel P. Brown>
Network Infrastructure Manager

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