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From Chuck Murcko <ch...@topsail.org>
Subject Re: mod_proxy/429: Logrotate utility causing possible SIGSEGVs when using mod_proxy & caching
Date Sun, 20 Apr 1997 16:57:18 GMT
Logrotate isn't distributed w/Apache AFAIK.

The rotatelogs program distributed with Apache works fine. It can also
be patched so isn't doesn't need to be used in a pipe, consuming extra
system resources. I can send you these patches, if you wish. Logs rotate
without the server shutting down.

Another alternative is to try chronolog, available from


Kill -HUP on Apache configured as a caching proxy doesn't cause any
problems that I can see.

Also, kill -HUP on every Apache child is liable to cause problems no
matter when you do it. Normal restart procedure is to use kill -HUP on
the parent process only. The PID of that process is available in
httpd.pid in the log directory.

Manoj Kasichainula wrote:
> >Number:         429
> >Category:       mod_proxy
> >Synopsis:       Logrotate utility causing possible SIGSEGVs when using mod_proxy
& caching
> >Confidential:   no
> >Severity:       serious
> >Priority:       medium
> >Responsible:    apache (Apache HTTP Project)
> >State:          open
> >Class:          sw-bug
> >Submitter-Id:   apache
> >Arrival-Date:   Sun Apr 20 09:10:01 1997
> >Originator:     manojk@io.com
> >Organization:
> apache
> >Release:        1.2b8
> >Environment:
> Red Hat Linux 4.1
> Kernel 2.0.27
> libc 5.3.12
> gcc
> >Description:
> When Apache is configured to serve as a caching proxy, and the logrotate
> utility is used to rotate the Apache's logs, Apache will always crash, sometimes
> report a segmentation fault, and sometimes will not restart until caching is
> disabled.
> >How-To-Repeat:
> Get the Red Hat RPM package I built for Apache 1.2b8 (it should be at
> ftp://ftp.redhat.com/pub/contrib/SRPMS/apache-1.2b8-1.src.rpm once it is moved
> out of the Incoming directory. Or set up the following logrotate configuration
> by placing it in the /etc/logrotate.d directory (any file name should do).
> Delete /var/lib/logrotate.status (the file that stores info on the last time
> logs were rotated) in order to force a log rotate. Make sure caching is enabled.
> Then run:
> /usr/sbin/logrotate /etc/logrotate.conf
> Apache will die, maybe report a SIGSEGV, and maybe won't restart until caching
> is disabled.
> Here's the config file (taken straight from Red Hat's Apache 1.1.3 package)
> /var/log/httpd/access_log {
>     postrotate
>         /usr/bin/killall -HUP httpd
>     endscript
> }
> /var/log/httpd/agent_log {
>     postrotate
>         /usr/bin/killall -HUP httpd
>     endscript
> }
> /var/log/httpd/error_log {
>     postrotate
>         /usr/bin/killall -HUP httpd
>     endscript
> }
> /var/log/httpd/referer_log {
>     postrotate
>         /usr/bin/killall -HUP httpd
>     endscript
> }
> >Fix:
> My guess is that the repeated SIGHUPs in rapid succession are causing hangups
> to be received in the code when they aren't handled yet. This code is probably
> cache initialization code, and it may be in the middle of an operation on the
> cache when it crashes, so the cache is corrupt and Apache gets very confused
> >Audit-Trail:
> >Unformatted:

Chuck Murcko
The Topsail Group, West Chester PA USA

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