We've created a plugin to clear caches in Fastly CDN. This seems to have identified a situation where the requestsExecute() function loops thru executing curl_multi_exec causing an endless loop each time a queue item is processed. Eventually the host memory is exhausted in this circumstance.
Details at http://php.net/manual/en/function.curl-multi-exec.php
There is a comment by Ren which explains an alternative way to execute the curl_multi_exec() function.
Solve CPU 100% usage, a more simple and right way:
do { curl_multi_exec($mh, $running); curl_multi_select($mh); } while ($running > 0);
The attached patch seems to solve this.
Fixed
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Issue #2893643 by selwynpolit: Curl_multi loop failures
Automatically closed - issue fixed for 2 weeks with no activity.