Hi, This issue was reported in http://curl.haxx.se/mail/lib-2014-02/0184.html. Unfortunately the reporter didn't suggest his patch.
This issue is caused by locking CURL_LOCK_DATA_COOKIE with specified cookie files. In this case, CURL_LOCK_DATA_COOKIE is locked before executing "FLUSH", and then Curl_cookie_loadfiles locks CURL_LOCK_DATA_COOKIE. This condition occurs deadlock. Attached as "fix_deadlock.patch" is to fix this issue. In addition, a simple function to load cookie files is needed for Curl library. When libcurl users just want to load their cookie files, they don't need a "FLUSH" cookie process. So I suggest that "LOAD" should be added as a new function of CURLOPT_COOKIELIST. I made a patch attached as "add_loadcmd.patch". These two patches are made from curl 7.36.0. Please check it. Thanks, Yousuke
fix_deadlock.patch
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add_loadcmd.patch
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