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Re: potential bug in multi_runsingle() in multi.c ?

From: Daniel Stenberg <daniel_at_haxx.se>
Date: Tue, 17 Jun 2008 22:35:59 +0200 (CEST)

On Tue, 17 Jun 2008, ??? wrote:

> recently, i'm testing curl-7.18.2 + libevent-1.4.4, using multi interface of
> curl and epoll of libevent

Pipelining enabled I presume? Can you provide a full source code to an app
that repeats your problems? It would make it so much easier...

> 1. easyhandle A reach CURLM_STATE_PERFORM state, and do
> Curl_removeHandleFromPipeline
> 2. easyhandle B do Curl_connect(), and in the ConnectionExists() function,
> it call Curl_disconnect(), and free the pipe which easyhandle A is using.

Why does it call disconnect? It's only supposed to do that if it deems the
connection "dead". Are you saying it thinks that wrongly?

> 3. easyhandle A reach CURLM_STATE_DONE state, do
> Curl_removeHandleFromPipeline again (A access the pipe, which is free by
> disconnect()), so it become some times segment fault, some times dead loop

Right, the disconnect seems to be done inproperly. I think perhaps the
check->inuse boolean should be checked before SocketIsDead() is called on it,
since if it actually is in use the SocketIsDead() function will cause a false
positive... Can you figure out any details on why it disconnects and what we
can fix to make it not do it for this case of yours?

-- 
  / daniel.haxx.se
Received on 2008-06-17

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