[Bug 1028470] Re: apache2+ssl hangs on high load

[Evgeny Anisiforov]

Unfortunately i do not get any PID with this method. The other end of
the connection is simply "-", not associated with any apache2 process:

root at ubuntu:/home/jeff# netstat -tnp |grep curl
tcp        0    161 127.0.0.1:33399         127.0.0.1:80            ESTABLISHED 347/curl        
root at ubuntu:/home/jeff# netstat -tnp | grep 33399
tcp        0      0 127.0.0.1:80            127.0.0.1:33399         SYN_RECV    -               
tcp        0    161 127.0.0.1:33399         127.0.0.1:80            ESTABLISHED 347/curl      

I have tried capturing the http traffic to get some insight: tcpdump -p -s0 -w dump.cap -i lo port 80
This is the dump of the last curl request. Wireshark shows me multiple tcp retransmits, but no reply from the server. So it may be something on the tcp level, that is going wrong. Could someone with a deeper understanding of tcp take a look on the dump?

If someone is interested, i can provide a downloadable virtual appliance
running ubuntu 12.04 with the reported bug (.OVF) from my virtualbox for
debugging purposes.

** Attachment added: "dump.cap"
   https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1028470/+attachment/3238977/+files/dump.cap

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Title:
  apache2+ssl hangs on high load

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