#40286 [Com]: PHP fastcgi with PHP_FCGI_CHILDREN don't kill children when parent is killed

From: Date: Thu, 09 Oct 2008 08:35:41 +0000
Subject: #40286 [Com]: PHP fastcgi with PHP_FCGI_CHILDREN don't kill children when parent is killed
References: 1  Groups: php.bugs 
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 ID:               40286
 Comment by:       natit at ctvnet dot dp dot ua
 Reported By:      gabriel at oxeva dot fr
 Status:           No Feedback
 Bug Type:         CGI related
 Operating System: Linux 2.6
 PHP Version:      5.2.0+
 Assigned To:      dmitry
 New Comment:

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Previous Comments:
------------------------------------------------------------------------

[2008-05-26 01:00:00] php-bugs at lists dot php dot net

No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".

------------------------------------------------------------------------

[2008-05-18 00:39:57] jani@php.net

Please try using this CVS snapshot:

  http://snaps.php.net/php5.2-latest.tar.gz
 
For Windows (zip):
 
  http://snaps.php.net/win32/php5.2-win32-latest.zip

For Windows (installer):

  http://snaps.php.net/win32/php5.2-win32-installer-latest.msi

We do not support 3rd party stuff, so PLEASE try the unpatched, clean
sources provided in above link.

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[2008-05-06 21:35:25] gabriel at oxeva dot fr

Bug reopened as requested by jakobunt at gmail dot com
It is indeed the same bug as the one I described: my logs were the same
as yours when I was using the php forking feature.

As far as I remember, the child php processes were dropped by the
parent php process (acting as a dispatcher) because apache's fastcgi
process manager "Fastcgi PM" sent a SIGKILL signal to it (the only PID
the fastcgi PM is aware of because it spawned it). This signal is
normally only sent if the process do not exit a few seconds after being
sent a SIGTERM signal. The problem is not the parent being killed, but
the children waiting on their own loop infinitely.

I guess this bug is in the fastcgi accept loop, which leaves the php
children stalled waiting on a FD without any process attached to the
other side.

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[2008-05-06 21:08:16] jakobunt at gmail dot com

I still experience this on Ubuntu Hardy, 
PHP 5.2.4-2ubuntu5 with Suhosin-Patch 0.9.6.2 (cgi-fcgi), so this
should be reopened.

A pstree showing the orphaned processes:
http://launchpadlibrarian.net/14265483/phpkiller.log

------------------------------------------------------------------------

[2007-11-11 22:22:59] jakob dot at at gmx dot net

Workaround: Kill those lurking process regularily using a cronjob.
This works for me (Ubuntu Dapper, PHP 5.1.2 (cgi-fcgi) (built: Jul 17
2007 17:21:59) ), you probably need pkill -9 .

#/bin/bash
pkill -f -x /usr/lib/cgi-bin/php -P 1

------------------------------------------------------------------------

The remainder of the comments for this report are too long. To view
the rest of the comments, please view the bug report online at
    http://bugs.php.net/40286

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Edit this bug report at http://bugs.php.net/?id=40286&edit=1

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