Lingering children tying up file handles

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Hello... We're using Apache 2.0.59 on Solaris.  I've noticed over the
last few bug/security releases, file handles being held open on rotated
log files when using graceful restarts.

>From what I understand, graceful restarting is the best way to do log
rotation.  But over the course of a few nightly log rotations, there are
rotated logs that never have their file handles closed, causing df to
incorrectly report a full filesystem.  The only fix is to either a) kill
the offending server process (if identifiable) or b) do a hard restart.

In the ps output below, I was able to identify the offending server (see
Nov 11 process **):

  nobody 23698  7548  0 12:26:15 ? httpd -k start
  nobody 23769  7548  0 12:27:30 ? httpd -k start
  nobody 23508  7548  0 12:24:33 ? httpd -k start
  nobody 26870  7548  0   Nov 11 ? httpd -k start **
  nobody 23704  7548  0 12:26:39 ? httpd -k start
    root  7548     1  0   Nov 08 ? httpd -k start
  nobody 25972  7548  0 18:40:32 ? httpd -k start
  nobody 23766  7548  0 12:27:10 ? httpd -k start
  nobody 23572  7548  0 12:25:00 ? httpd -k start
  nobody 23636  7548  0 12:25:08 ? httpd -k start
  nobody 23430  7548  0 12:23:29 ? httpd -k start
  nobody 23436  7548  0 12:23:34 ? httpd -k start
  nobody 23703  7548  0 12:26:37 ? httpd -k start
  nobody 23767  7548  0 12:27:18 ? httpd -k start

The Nov 11 server was three days old (and was not the parent process),
so it stuck out, and killing it "freed up" the "used" space in df.

We use the worker MPM as follows:

StartServers           40
MaxClients            350
MinSpareThreads        40
MaxSpareThreads        75
ThreadsPerChild        25
MaxRequestsPerChild 10000

I tried setting MaxRequestsPerChild in an effort to force aging children
to die, but that hasn't helped.

Can anyone explain why these rogue children are not going away over
time?  Do I simply need to stop using "graceful" in my log rotations
(though less desirable)?

Thanks for reading.


-- 
Chris Boyce



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