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From Ulf Bahrenfuss <ulf.bahrenf...@uni-vechta.de>
Subject mod_proxy/5391: hanging connection causes large traffic
Date Tue, 30 Nov 1999 09:54:30 GMT

>Number:         5391
>Category:       mod_proxy
>Synopsis:       hanging connection causes large traffic
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    apache
>State:          open
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Tue Nov 30 04:10:00 PST 1999
>Last-Modified:
>Originator:     ulf.bahrenfuss@uni-vechta.de
>Organization:
apache
>Release:        1.3.9
>Environment:
Linux 2.2.10 #7
gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)
>Description:
Sometimes, accessing a certain website (www.gratis.de) via our proxy will cause
the httpd making the connection to hang. The status page does not list the traffic
but a tcpdump gets this:

09:57:31.431205 romberg.kiz.uni-vechta.de.3022 > gratis.de.www: . ack 1339 win 32120 (DF)
09:57:31.432184 gratis.de.www > romberg.kiz.uni-vechta.de.3022: P 1339:1340(1) ack 1 win
32736 (DF)
09:57:31.451203 romberg.kiz.uni-vechta.de.3022 > gratis.de.www: . ack 1340 win 32120 (DF)
09:57:31.451803 gratis.de.www > romberg.kiz.uni-vechta.de.3022: P 1340:1341(1) ack 1 win
32736 (DF)
09:57:31.471203 romberg.kiz.uni-vechta.de.3022 > gratis.de.www: . ack 1341 win 32120 (DF)
09:57:31.471955 gratis.de.www > romberg.kiz.uni-vechta.de.3022: P 1341:1342(1) ack 1 win
32736 (DF)
09:57:31.491206 romberg.kiz.uni-vechta.de.3022 > gratis.de.www: . ack 1342 win 32120 (DF)
09:57:31.492437 gratis.de.www > romberg.kiz.uni-vechta.de.3022: P 1342:1343(1) ack 1 win
32736 (DF)
09:57:31.511206 romberg.kiz.uni-vechta.de.3022 > gratis.de.www: . ack 1343 win 32120 (DF)
09:57:31.514062 gratis.de.www > romberg.kiz.uni-vechta.de.3022: P 1343:1344(1) ack 1 win
32736 (DF)
09:57:31.531210 romberg.kiz.uni-vechta.de.3022 > gratis.de.www: . ack 1344 win 32120 (DF)
09:57:31.534053 gratis.de.www > romberg.kiz.uni-vechta.de.3022: P 1344:1345(1) ack 1 win
32736 (DF)
09:57:31.551205 romberg.kiz.uni-vechta.de.3022 > gratis.de.www: . ack 1345 win 32120 (DF)
09:57:31.556170 gratis.de.www > romberg.kiz.uni-vechta.de.3022: P 1345:1346(1) ack 1 win
32736 (DF)

This until I kill the httpd-process in question. We had three occasions with a 
IP-Volume of about 1.5 GB in each direction. There are no correcsponding acces-log
entries. In at least two cases the acces causing the hanging proxy was never logged
at all.

We do not have any related problems with any other site.

Ulf
>How-To-Repeat:
Good question... Until now I have not been able to reproduce the problem on purpose.
It just happens...
>Fix:
Nope
>Audit-Trail:
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