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Bug #43114 multiple servers outputting error_log onto shared NFS file include garbage byte
Submitted: 2007-10-27 07:20 UTC Modified: 2007-10-28 13:07 UTC
From: tom at razz dot com Assigned:
Status: Not a bug Package: *General Issues
PHP Version: 5.2.4 OS: Fedora 7
Private report: No CVE-ID: None
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From: tom at razz dot com
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 [2007-10-27 07:20 UTC] tom at razz dot com 
Description:
------------
i'm attempting to log php errors from multiple web servers (3) to a 
single nfs-mounted file:

error_reporting  =  E_ALL & ~E_NOTICE & ~E_STRICT
display_errors = Off
log_errors = On
error_log = /mnt/logs/php/webprod-php-error.log

lines are written in production to this file perhaps 1-3 every minute 
via error_log facility.  there aren't logging collisions at the 
moment.

nfs server is a netapp fas3020c.
fstab line is:
nyp-netapp-2:/vol/logs     /mnt/logs               nfs     
rw,bg,soft,rsize=32768,wsize=32768,vers=3 0 0


Thanks for the help!








Reproduce code:
---------------
<?php
// run concurrently from multiple servers to see garbage appear
while(1) {
  sleep(rand(1,5));
  error_log("test error");
}



Expected result:
----------------
an error log without garbage ^@ entries in between lines.

interestingly, writing my own error_log which explicitly does:

$lfp=fopen("/mnt/logs/logfile.txt","a");
fwrite($lfp,$log_message);
fclose($lfp);

does not result in the garbage data being inserted.








Actual result:
--------------
log contents look similar to this:

[26-Oct-2007 23:57:20] /usr/local/www/web/common/php-
include/facebook/class.Movi
eLines.php : Using cached values
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
^@^@^@^@^@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
^@^@^@^@^@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
^@^@^@^@^@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
^@^@^@^@^@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
^@^@^@^@^@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
^@^@^@^@^@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
^@^@^@^@^@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
^@^@^@^@^@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
^@^@^@^@^@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
^@^@^@^@^@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
^@^@^@^@^@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
^@^@^@^@^@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
^@^@^@^@^@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
^@^@^@^@^@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
^@^@^@^@^@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
^@^@^@^@^@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@[26-Oct-2007 
23:57:44] /usr/
local/www/web/common/php-include/facebook/class.Movies.php : Using 
cached values
[26-Oct-2007 23:57:44] /usr/local/www/web/common/php-
include/facebook/class.Movi
eLines.php : Using cached values

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 [2007-10-28 13:07 UTC] iliaa@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

NFS locking is not reliable, so file corruption is not entirely un-
expected.
 
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