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Re: [users@httpd] mpm worker proxy: High CPU load, unresponsive

Igor Gali?

2008-07-07

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>> 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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