https://bz.apache.org/bugzilla/show_bug.cgi?id=59644
Bug ID: 59644
Summary: It is possible to have uncontrolled httpd instance
Product: Apache httpd-2
Version: 2.4.20
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Core
Assignee: [email protected]
Reporter: [email protected]
At first about the problem. If start Apache twice, it may happen that second
instance will ignore the first one:
> % sudo apachectl restart && sudo apachectl restart
> httpd not running, trying to start
> httpd not running, trying to start
> % ps -ef | grep httpd | grep -v grep
> root 28608 1 0 04:58 ? 00:00:00 /usr/local/apache2/bin/httpd
> -k restart
> daemon 28613 28608 0 04:58 ? 00:00:00 /usr/local/apache2/bin/httpd
> -k restart
> daemon 28614 28608 0 04:58 ? 00:00:00 /usr/local/apache2/bin/httpd
> -k restart
> daemon 28615 28608 0 04:58 ? 00:00:00 /usr/local/apache2/bin/httpd
> -k restart
> daemon 28616 28608 0 04:58 ? 00:00:00 /usr/local/apache2/bin/httpd
> -k restart
> root 28617 1 0 04:58 ? 00:00:00 /usr/local/apache2/bin/httpd
> -k restart
> daemon 28699 28617 0 04:58 ? 00:00:00 /usr/local/apache2/bin/httpd
> -k restart
> daemon 28700 28617 0 04:58 ? 00:00:00 /usr/local/apache2/bin/httpd
> -k restart
> daemon 28701 28617 0 04:58 ? 00:00:00 /usr/local/apache2/bin/httpd
> -k restart
> daemon 28702 28617 0 04:58 ? 00:00:00 /usr/local/apache2/bin/httpd
> -k restart
And here are the problem, one of httpd groups becomes uncontrolled by the usual
way:
> % sudo apachectl stop
> % sudo apachectl stop
> httpd (no pid file) not running
> % ps -ef | grep httpd | grep -v grep
> root 28608 1 0 04:58 ? 00:00:00 /usr/local/apache2/bin/httpd
> -k restart
> daemon 28613 28608 0 04:58 ? 00:00:00 /usr/local/apache2/bin/httpd
> -k restart
> daemon 28614 28608 0 04:58 ? 00:00:00 /usr/local/apache2/bin/httpd
> -k restart
> daemon 28615 28608 0 04:58 ? 00:00:00 /usr/local/apache2/bin/httpd
> -k restart
> daemon 28616 28608 0 04:58 ? 00:00:00 /usr/local/apache2/bin/httpd
> -k restart
Second httpd instance overwrites pid file (from log: "pid file
/usr/local/apache2/logs/httpd.pid overwritten -- Unclean shutdown of previous
Apache run?") so there are no regular way to control first httpd instance.
How to reproduce. It seems httpd should be quite heavy to achieve this (with a
lot of modules). Default way (configure && make && sudo make install) works ok,
but for example using this way it reproduces for me on clean CentOS 7.1:
> % configure --enable-modules=all --enable-mods-static=all
> % make && sudo make install
Issue might sitting there for a lot of time. In 2.2 it is similar with one
conceptual difference:
> % sudo apachectl restart && sudo apachectl restart
> httpd not running, trying to start
> httpd not running, trying to start
> (98)Address already in use: make_sock: could not bind to address [::]:80
> (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80
> no listening sockets available, shutting down
> Unable to open logs
That inability to bind port saves from second httpd instance. But since 2.4.17
there is unconditionally used SO_REUSEPORT on listening socket (even if feature
that it is intended for is not used), so binding of already bound port goes
without errors.
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