[Bug 1279819] [NEW] php5-fpm reload kills master process without its children

[Oliver Mueller]

Public bug reported:

php-fpm uses a master process to control its children. the problem is,
that a service reload is going to kill this master process without
recovering it or killing its children.

here is an example:

# ps aux|grep fpm
root     20590  1.3  0.0 190264 22380 ?        Ss   14:54   0:00 php-fpm: master process (/etc/php5/fpm/php-fpm.conf)
www-data 20592  0.0  0.0 190264 14456 ?        S    14:54   0:00 php-fpm: pool www
www-data 20593  0.0  0.0 190264 14456 ?        S    14:54   0:00 php-fpm: pool www
www-data 20594  0.0  0.0 190264 14456 ?        S    14:54   0:00 php-fpm: pool www
www-data 20595  0.0  0.0 190264 14456 ?        S    14:54   0:00 php-fpm: pool www
root     20597  0.0  0.0 118224   948 pts/2    S+   14:54   0:00 grep --color=auto fpm

FPM is running, but if I do a reload now, the master will disappear

# service php5-fpm reload
# ps aux|grep fpm
www-data 22316  0.0  0.0 190264 14456 ?        S    14:57   0:00 php-fpm: pool www
www-data 22317  0.0  0.0 190264 14456 ?        S    14:57   0:00 php-fpm: pool www
www-data 22318  0.0  0.0 190264 14456 ?        S    14:57   0:00 php-fpm: pool www
www-data 22319  0.0  0.0 190264 14456 ?        S    14:57   0:00 php-fpm: pool www
root     22418  0.0  0.0 118224   948 pts/2    S+   14:59   0:00 grep --color=auto fpm


when this happens, there is basically no easy way of reloading or restarting or stopping this service again, because even a restart cannot find them anymore:

# service php5-fpm restart
stop: Unknown instance:
php5-fpm start/running, process 23494
root at davy ~ # ps aux|grep fpm
www-data 22316  0.0  0.0 190264 14456 ?        S    14:57   0:00 php-fpm: pool www
www-data 22317  0.0  0.0 190264 14456 ?        S    14:57   0:00 php-fpm: pool www
www-data 22318  0.0  0.0 190264 14456 ?        S    14:57   0:00 php-fpm: pool www
www-data 22319  0.0  0.0 190264 14456 ?        S    14:57   0:00 php-fpm: pool www
root     23949  0.0  0.0 118224   948 pts/2    S+   15:00   0:00 grep --color=auto fpm


the master service is still gone.

if i use a restart or stop/start only, everything seems to work find.
The bug seems to be in reload functionality only.


# lsb_release -rd
Description:	Ubuntu 13.10
Release:	13.10

# apt-cache policy php5-fpm
php5-fpm:
  Installed: 5.5.3+dfsg-1ubuntu2.1
  Candidate: 5.5.3+dfsg-1ubuntu2.1
  Version table:
 *** 5.5.3+dfsg-1ubuntu2.1 0
        500 http://mirror.hetzner.de/ubuntu/packages/ saucy-updates/universe amd64 Packages
        500 http://mirror.hetzner.de/ubuntu/security/ saucy-security/universe amd64 Packages
        500 http://de.archive.ubuntu.com/ubuntu/ saucy-updates/universe amd64 Packages
        500 http://security.ubuntu.com/ubuntu/ saucy-security/universe amd64 Packages
        100 /var/lib/dpkg/status
     5.5.3+dfsg-1ubuntu2 0
        500 http://mirror.hetzner.de/ubuntu/packages/ saucy/universe amd64 Packages
        500 http://de.archive.ubuntu.com/ubuntu/ saucy/universe amd64 Packages

** Affects: php5 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: php5 php5-fpm reload service

** Tags added: php5

** Tags added: php5-fpm reload service

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https://bugs.launchpad.net/bugs/1279819

Title:
  php5-fpm reload kills master process without its children

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