Bug #52501 [PATCH]: Misconfigured Sendmail sends PHP-FPM into an infinite loop

From: Date: Fri, 17 Sep 2010 07:49:09 +0000
Subject: Bug #52501 [PATCH]: Misconfigured Sendmail sends PHP-FPM into an infinite loop
References: 1  Groups: php.bugs 
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Edit report at http://bugs.php.net/bug.php?id=52501&edit=1

 ID:                 52501
 Patch added by:     fat@php.net
 Reported by:        marekroman1 at gmail dot com
 Summary:            Misconfigured Sendmail sends PHP-FPM into an
                     infinite loop
 Status:             Feedback
 Type:               Bug
 Package:            FPM related
 Operating System:   DebianLenny2.6.26-2-openvz-amd64
 PHP Version:        5.3.3
 Assigned To:        fat
 Block user comment: N

 New Comment:

The following patch has been added/updated:

Patch Name: fpm-nomorelibevent.v5.patch
Revision:   1284709749
URL:       
http://bugs.php.net/patch-display.php?bug=52501&patch=fpm-nomorelibevent.v5.patch&revision=1284709749


Previous Comments:
------------------------------------------------------------------------
[2010-09-14 17:37:55] fat@php.net

Can you please test the following patch ?

This patch removes libevent from FPM. A simple select base event
mechanism has 
been made instead. It should prevent the forking problem when using
libevent.

------------------------------------------------------------------------
[2010-09-14 17:36:23] fat@php.net

The following patch has been added/updated:

Patch Name: fpm-nomorelibevent.v2.patch
Revision:   1284478582
URL:       
http://bugs.php.net/patch-display.php?bug=52501&patch=fpm-nomorelibevent.v2.patch&revision=1284478582

------------------------------------------------------------------------
[2010-07-31 21:46:46] marekroman1 at gmail dot com

Oh, thanks fat.

------------------------------------------------------------------------
[2010-07-31 17:25:58] fat@php.net

the problem does not exist when using kqueue,poll or select on openbsd
(and 
certainely on freebsd also).

the problem exists on linux when using epoll,poll or select.

It's all the problem of the libevent when forking.

------------------------------------------------------------------------
[2010-07-31 03:23:51] fat@php.net

when calling the mail() function on unix, there is a fork to run the
sendmail command. If the sendmail does not return 
quickly and FPM tries to kill the process because of
request_terminate_timeout the bug happens.

Here is a sample C code to simulate a bug sendmail config:

// sendmail_bug.c
#include <stdio.h>

int main() {
  char buf[11];
  while (1) {
    read(0, buf, 10);
  }
  return 0;
}

gcc -o /tmp/sendmail_bug sendmail_bug.c

then configure your php.ini this way:
sendmail_path = /tmp/sendmail_bug

set request_terminate_timeout to a 5s and load a page with the mail
function.

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


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