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From Igor Galić <i.ga...@brainsware.org>
Subject Re: [users@httpd] mpm worker proxy: High CPU load, unresponsive
Date Mon, 07 Jul 2008 12:03:34 GMT



>> I can often see in the error log that it segfaults, but it does not
>> core-dump. mod_whatkilledus is mostly inconclusive, and mod_backtrace
>> doesn't seem to hook in:
>
> Confusing!

I wrote this mail over the last two days while collecting data, so maybe 
the wording is a bit off the track ;)

> Couple of thoughts:
>  * Does this persist if you switch back to APR-1.2.latest?

I don't know, haven't tried yet, right now I also don't have a possibility 
to try it out.

>  * You said on IRC that you got the crash with a traceback
>    with prefork.  Does the traceback reveal anything?

I have a couple of core dumps from different domains, and now I even found 
one from yesterday that was caused by the proxy (the log does't say that 
it core dumped):

Core was generated by `/opt/bw/bin/httpd-worker -f /opt/bw/etc/apache/proxy/reverse_proxy-httpd.conf'.
Program terminated with signal 11, Segmentation fault.
#0  0x00002b61978fd86b in ?? ()
(gdb) where
#0  0x00002b61978fd86b in ?? ()
#1  0x00007fff00000000 in ?? ()
#2  0x00000000006b1e78 in ?? ()
#3  0x0000000000000003 in ?? ()
#4  0x0000000000000028 in ?? ()
#5  0x000000001f5cfd7f in ?? ()
#6  0x00002b61978fdcdd in ?? ()
#7  0x0000000000000040 in ?? ()
#8  0x0000000000000010 in ?? ()
#9  0x000000029cb46fa0 in ?? ()
#10 0x0000003f00000028 in ?? ()
#11 0x00000000007d73f5 in ?? ()
#12 0x00007fff131b31e0 in ?? ()
#13 0x00007fff131b3368 in ?? ()
#14 0x0000000000000c70 in ?? ()
#15 0x0000000000000000 in ?? ()
(gdb) thread apply all bt

Thread 1 (process 22492):
#0  0x00002b61978fd86b in ?? ()
#1  0x00007fff00000000 in ?? ()
#2  0x00000000006b1e78 in ?? ()
#3  0x0000000000000003 in ?? ()
#4  0x0000000000000028 in ?? ()
#5  0x000000001f5cfd7f in ?? ()
#6  0x00002b61978fdcdd in ?? ()
#7  0x0000000000000040 in ?? ()
#8  0x0000000000000010 in ?? ()
#9  0x000000029cb46fa0 in ?? ()
#10 0x0000003f00000028 in ?? ()
#11 0x00000000007d73f5 in ?? ()
#12 0x00007fff131b31e0 in ?? ()
#13 0x00007fff131b3368 in ?? ()
#14 0x0000000000000c70 in ?? ()
#15 0x0000000000000000 in ?? ()



> -- 
> Nick Kew

So long,
Igor

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