From: chris at mysociety dot org Operating system: n/a PHP version: 4.4.2 PHP Bug Type: *Web Server problem Bug description: SIGTERM is not handled correctly when running as a FastCGI server
Description: ------------ When php is running as a FastCGI server, it should handle SIGTERM and execute a graceful shutdown, because the mod_fastcgi process manager uses this signal to shut down excess dynamic servers. "Graceful" in this context means that the server must finish handling any outstanding request and then terminate its connection to the web server. Presently, PHP does not handle SIGTERM at all in the FastCGI request loop, so that on receipt of SIGTERM, php aborts, even if half-way through a request. This typically results in the web server logging "Incomplete headers (0 bytes) received", and returning "500 Internal Server Error" to the client. I have prepared a patch for this issue, here: http://bitter.ukcod.org.uk/~chris/tmp/20060125/php-4.3.10-fastcgi-sigterm-fix.patch -- this is against 4.3.10, but it applies to 4.4.2 fine. Reproduce code: --------------- Put the following in a .php file: <? sleep(1); print "fish"; ?> and set it up to run under FastCGI. Set up a script to request the page in a loop ("while : ; do wget -O/dev/null -q http://path/to/script ; done") Then kill the PHP process (pkill php will do this under Linux). If you catch the script in the sleep, this will result in the client getting a 500 and the web server logging a message about php failing, as describe above. Expected result: ---------------- No errors. Actual result: -------------- 500 error. -- Edit bug report at http://bugs.php.net/?id=36158&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=36158&r=trysnapshot44 Try a CVS snapshot (PHP 5.1): http://bugs.php.net/fix.php?id=36158&r=trysnapshot51 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=36158&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=36158&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=36158&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=36158&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=36158&r=needscript Try newer version: http://bugs.php.net/fix.php?id=36158&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=36158&r=support Expected behavior: http://bugs.php.net/fix.php?id=36158&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=36158&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=36158&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=36158&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=36158&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=36158&r=dst IIS Stability: http://bugs.php.net/fix.php?id=36158&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=36158&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=36158&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=36158&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=36158&r=mysqlcfg
