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Posted to bugs@httpd.apache.org by bu...@apache.org on 2014/01/14 22:49:33 UTC
[Bug 56008] New: IfDefine not evaluated correctly after some reloads
https://issues.apache.org/bugzilla/show_bug.cgi?id=56008
Bug ID: 56008
Summary: IfDefine not evaluated correctly after some reloads
Product: Apache httpd-2
Version: 2.4.6
Hardware: PC
OS: Linux
Status: NEW
Severity: major
Priority: P2
Component: Core
Assignee: bugs@httpd.apache.org
Reporter: stgrein@gmail.com
We used the Apache 2.4.2 and since availablity 2.4.6 in our global Apache
Setup.
It occured three times now (at different config sections) that the check with
IfDefine was not evaluated correctly which resulted in big errors.
Here is a simple example to show how drastic the implications can be: Let us
assume we have an apache httpd 2.4.6 in the USA and one in the UK.
The daemons are started with the -D flag as follows:
USA: -DUSA
UK: -DUK
Both have this config:
__________________________
Define ip_of_USA_location 10.30.0.2
Define ip_of_UK_location 10.40.0.2
<VirtualHost ${ip_of_XXX_location}:80>
# some configs
# ...
RewriteEngine On
<IfDefine USA>
RewriteRule ^/(.*)$
http://${ip_of_UK_location}/getSomeStuffOnlyAvailableInUk/$1 [P]
</IfDefine>
<IfDefine UK>
RewriteRule ^/(.*)$
http://${ip_of_USA_location}/getSomeStuffOnlyAvailableInUsa/$1 [P]
</IfDefine>
# some configs
# ...
</VirtualHost>
___________________________
Now after several days/reloads/MaxConnectionsPerChild the UK-httpd "thinks"
that USA is defined.
That will result in a loop because UK-httpd enters the vhost with UK-IP and
proxies to the vhost with UK-IP and so on and endless on.
An other example would be some BalancerMembers only available in that zone. If
both are defined the following would produce serious trouble:
<IfDefine USA>
BalancerMember http://10.30.0.70 ...
BalancerMember http://10.30.0.71 ...
</IfDefine>
<IfDefine UK>
BalancerMember http://10.40.0.70 ...
BalancerMember http://10.40.0.71 ...
</IfDefine>
I perhaps should also mention that we use mpm_event.
When the daemon is startet or restartet there works everything as expected. In
most of the time when the daemon is reloaded/forks new childs there is also no
problem.
We hit that bug now three times in a year and because of my configuration the
only thing possible is that the IfDefine sections are not working properly.
I know it is really hard to reproduce, because it works thousend times but in
one not, but the problem is there. Heisenbug? :P
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[Bug 56008] IfDefine not evaluated correctly after some reloads
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56008
Armin Abfalterer <a....@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Depends on| |57328
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[Bug 56008] IfDefine not evaluated correctly after some reloads
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56008
--- Comment #1 from Armin Abfalterer <a....@gmail.com> ---
Hi Stefan,
I had the same problem and I've found out that there is a bug in the apache
core
See my report at https://issues.apache.org/bugzilla/show_bug.cgi?id=57328
I hope the patch will be incorporated asap...
Regards, Armin
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[Bug 56008] IfDefine not evaluated correctly after some reloads
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56008
Stefan Greiner <st...@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |stgrein@gmail.com
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[Bug 56008] IfDefine not evaluated correctly after some reloads
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56008
Yann Ylavic <yl...@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Depends on|57328 |
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[Bug 56008] IfDefine not evaluated correctly after some reloads
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56008
Yann Ylavic <yl...@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #2 from Yann Ylavic <yl...@gmail.com> ---
A fix was commited in trunk (r1643825) for Bug 57328.
Marking this report as duplicated, please re-open if r1643825 does not fix this
issue.
*** This bug has been marked as a duplicate of bug 57328 ***
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