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Bug #26558 High load of OCI-Calls crash on multiprocessor machine with Apache2
Submitted: 2003-12-09 04:38 UTC Modified: 2003-12-16 10:55 UTC
Votes:1
Avg. Score:4.0 ± 0.0
Reproduced:0 of 0 (0.0%)
From: k_becker at kat dot de Assigned: tony2001 (profile)
Status: Closed Package: OCI8 related
PHP Version: 4.3.4 OS: Windows 2000 Adv. Server
Private report: No CVE-ID: None
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 [2003-12-09 04:38 UTC] k_becker at kat dot de 
Description:
------------
Platform: 4-CPU machine, Apache 2.0.39..48, PHP 4.3.x, Win 2000 Adv. server engl., OCI8, Oracle 8.1.7EE

When issuing multiple Oracle-requests at once, the Apache client thread dies with protection fault (C0000005) without any further message from PHP, Oracle or Apache.

Same code runs okay on one-CPU machine with same platform. Changing Apache to 1.3.28 helped.

Could be a problem within the PHP for Apache2 parallelization on more than one CPU.

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 [2003-12-10 05:56 UTC] k_becker at kat dot de 
I tried the "MaxThreadsPerChild=1" from Bug#19517. No crashes, but Apache "... ran out of threads".

Then set 
MaxRequestsPerChild 100000,
ThreadsPerChild 100
and tried using the explicit Oracle address string from TNSnames.ora. This seems to work.

Then tried php4-win32-STABLE-latest.zip of 2003-dec-10: Same result.

I now have: Apache/1.3.28 (Win32) PHP/4.3.5-dev, OCI8 Revision: 1.183.2.7 on Windows 2000 adv. server build 2195 with MaxRequestsPerChild 100000, ThreadsPerChild 100.

Temporary solution seems to be using the TNS address string in OCILogon("user", "pass", "(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=127.0.0.1)(PORT=1521)))(CONNECT_DATA=(SID=xxx))")

So, problem seems to be in the Oracle/Oci8 name resolving in concurrent OCILogon()'s from multiple Apache/PHP-threads.
 [2003-12-10 09:19 UTC] tony2001@php.net 
it seems to me, this bug appears due to the fact, that current implementation of ext/oci8 doesn't use OCI_THREADED flag with OCIInitialize();

Maxim tells about it here:
http://www.zend.com/lists/php-dev/200301/msg00213.html

OCI docs about OCI's thread safety are here:
http://docs.linux.cz/Oracle8/server/a58234/new_adva.htm#427495

I think, I can add this feature shortly.
 [2003-12-16 10:55 UTC] tony2001@php.net 
This bug has been fixed in CVS.

In case this was a PHP problem, snapshots of the sources are packaged
every three hours; this change will be in the next snapshot. You can
grab the snapshot at http://snaps.php.net/.
 
In case this was a documentation problem, the fix will show up soon at
http://www.php.net/manual/.

In case this was a PHP.net website problem, the change will show
up on the PHP.net site and on the mirror sites in short time.
 
Thank you for the report, and for helping us make PHP better.

should be fixed in CVS.
 
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