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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 36636] - blocking writev()/poll()-call causes mod_dav to stop responding
Date Thu, 15 Sep 2005 10:11:31 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=36636





------- Additional Comments From arne@arne.net  2005-09-15 12:11 -------
Thanks for the remark on SIGPIPE (I know, I should have rtfm :)
Anyway, when I block outgoing RST packets from my test machine so I can send my
packet dump replay without interference from the host TCP/IP stack (since it
uses a libndis userspace stack for replaying), the host stack does not reply
with a RST to attempts from the server that is trying to push the data to the
client [of the aborted replayed PROPFIND request]. 
That lead to the ability to reproduce the problem in all cases.
Since your patch to mod_dav (check for aborted) and my analogous patch for
core_output_filter reduce the number of writes to one, while the readonly
DavLockDB patch further reduces the "problem" to serialized write-access, the
remaining poll() call most likely conforms to the protocol.
We are reducing the timeout and looking into the proposed alternative backends
for mod_dav.

Thank you very much for your help in pinning down the problem!

What are the chances these patches (or similar, improved ones) make it into
mainstream Apache?


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