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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 45483] New: Orphan thread consume 100% cpu
Date Fri, 25 Jul 2008 13:00:44 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=45483

           Summary: Orphan thread consume 100% cpu
           Product: Apache httpd-2
           Version: 2.2.9
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: critical
          Priority: P2
         Component: Core
        AssignedTo: bugs@httpd.apache.org
        ReportedBy: esuran@generali.fr


We run Apache as reverse proxy cache in front of our web servers, with worker
as MPM. After upgrade from 2.2.7 to 2.2.9 we experience the following issue:
After a while, a thread consumes a whole CPU, his parent process is already
dead so it has been attached to the root HTTPD process.
In some cases, Apache do not listen anymore for incoming connections.

I guess the problem appears when the MaxRequestsPerChild connections has been
reached and the parent process is stopped.

The error log file shows errors like:
[Thu Jul 24 23:42:39 2008] [notice] child pid 18239 exit signal Segmentation
fault (11)
but we cannot link the time of occurrences with the moment the cpu is fully
used.

strace does not show anything, we do not manage to make thread generate a core
dump.

Regards.


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