i saw something similar on fc2. upgrade curl to 7.14 fixed the issue.
7.12.3 is ancient.

allan

On Tue, Aug 16, 2005, James Bailey <james.bailey_at_voxpilot.com> said:

> Hi.
>
> We have integrated libcurl 7.12.3 into a multi-threaded application and
> built on Linux (RedHat Enterprise Server 3). A customer has experienced
> some segmentation faults when the application is configured to use a
> HTTP proxy and is attempting a POST request - in each case the stack
> trace looks as follows:
>
> #0 0x080eb58a in strcasecmp ()
> #1 0x001845ce in curl_strequal (first=0x0, second=0xb7198e48
> "svr-prd-web-001") at strequal.c:40
> #2 0x00178d5e in ConnectionExists (data=0xb718f658, needle=0xb719bf20,
> usethis=0xf692e0) at url.c:1605
> #3 0x0017a330 in CreateConnection (data=0xb718f658,
> in_connect=0x5582148, addr=0x55820e8, async=0x558211b "") at url.c:3111
> #4 0x0017b50b in Curl_connect (data=0xb718f658, in_connect=0x5582148,
> asyncp=0x558211b "") at url.c:3483
> #5 0x00184165 in Curl_connect_host (data=0xb718f658, conn=0x5582148) at
> transfer.c:2045
> #6 0x00184272 in Curl_perform (data=0xb718f658) at transfer.c:2104
> #7 0x0018499f in curl_easy_perform (curl=0xb718f658) at easy.c:389
>
> So it seems there is a NULL pointer being passed into strcasecmp,
> causing the crash. It looks like it is the proxy.name that is NULL.
> Also, this only seems to happen after a previous call to
> curl_easy_perform() (using the same CURL* handle) returned
> CURLE_COULDNT_RESOLVE_PROXY (which in turn seems to have been caused by
> the DNS name look-up timing out).
> Unfortunately I have not been able to reproduce this in-house and am
> relying on traces/logs sent by the customer.
> Is this a known issue with this version (I couldn't find any reference
> to in the archives), and if not, can you see how this could happen under
> these circumstances?
> In the meantime, I guess a work-around would be to destroy the existing
> CURL* handle and create a new one in the case of a
> CURLE_COULDNT_RESOLVE_PROXY?
>
> Rgds,
> James Bailey
>

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