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Re: Memory leak with curl_multi_socket_action

From: Patrick Monnerat via curl-library <curl-library_at_cool.haxx.se>
Date: Tue, 26 May 2020 08:21:32 +0200

On 5/26/20 1:15 AM, James Read via curl-library wrote:
>
> git clone https://github.com/JamesRead5737/libcurlmemoryleak.git
>
> No need to make. Just compile with gcc crawler.c -g -lssl -lcurl
> Run valgrind with valgrind -v --tool=memcheck --leak-check=full
> --show-reachable=yes --track-origins=yes --log-file=memcheck.log ./a.out
>
> This should reproduce what I've been talking about.
>
Upon termination, you call curl_multi_cleanup() that still has easy
handles attached to. As a consequence, they are never freed. See 1st
description paragraph of
https://curl.haxx.se/libcurl/c/curl_multi_cleanup.html.

Unfortunately, there is no API that lists attached easy handles, so you
have to keep a list externally and unlink+cleanup them explicitly before
curl_multi_cleanup call. I tried that (with a very primitive
single-linked list in ConnInfo) and it works: all memory leaks disappear.

Patrick

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Received on 2020-05-26