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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 47645] httpd-2.2.12 often hangs for hours
Date Thu, 06 Aug 2009 13:43:53 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=47645



--- Comment #7 from HWS <strube@physik3.gwdg.de> 2009-08-06 06:43:46 PDT ---
Before recompiling and doing new tests (which I have to delay till after the
next hang), here some remarks:

> I had a similar situation
>with the event MPM once and this same implementation of apr_pollset_poll(),
>but I didn't have time to debug or to narrow it down to one of {Event MPM,
>APR, Solaris kernel}.
>You will likely be able to work around the problem by selecting a different
>poll implementation.

As far as I can see, 2.2.11 used exactly the same implementation, without any
difficulties. The only change now is setting FD_CLOEXEC.

>The TCP layer should answer a SYN packet.  Did that happen?
>What does netstat show at the time of the hang?  If connections are able to
>reach the ESTABLISHED state but not responded to, then TCP is doing the right
>thing and httpd isn't finding the connection.  If none reach the ESTABLISHED
>state, then it is a TCP layer issue.

I have to wait for the next hang, but as far as I remember, snoop did not show
any 'A' packets as reply to 'S' packets. If I remember the netstat output
correctly, old connections were visible, but no new ones.

>BTW, what exactly did you do to clear up the hang?

Often nothing, but then it took hours to recover. Graceful restart always
cleared the hang.

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