Bug #78485 [Com]: Random "couldn't resolve host" failures in curl_multi

Edit report at https://bugs.php.net/bug.php?id=78485&edit=1 ID: 78485 Comment by: sinus at sinpi dot net Reported by: sinus at sinpi dot net Summary: Random "couldn't resolve host" failures in curl_multi Status: Open Type: Bug Package: HTTP related Operating System: CloudLinux PHP Version: 7.2.22 Block user comment: N Private report: N New Comment: Oddly enough, enabling or disabling of any PHP modules was causing the errors to either visibly decrease, or just as significantly increase in frequency. Updating to PHP 7.3.9, still cURL 7.62.0, stabilized the issue enough to say: enabling opcache causes failures to create getaddrinfo threads. Previous Comments: ------------------------------------------------------------------------ [2019-09-03 15:43:27] sinus at sinpi dot net The situation develops. Disabling the opcache module made the issue go away entirely! ------------------------------------------------------------------------ [2019-09-03 09:26:09] sinus at sinpi dot net I now added CURLOPT_VERBOSE output to the bug.php script, and it demonstrated the failing handle throwing the following at me: * getaddrinfo() thread failed to start The plot thickens. ------------------------------------------------------------------------ [2019-09-02 21:17:57] sinus at sinpi dot net Seeing as I've never seen this happen on my previous host, I suspect it's a conflict with some local setup, not a bug in curl itself - but it'd be nice if there was a way to find out what could possibly cause it to behave like that. ------------------------------------------------------------------------ [2019-09-02 20:54:23] sinus at sinpi dot net You might have to reload it a few times, as I said, it's pretty random. Reproductions of the bug are seen as "Msg: 6 for handle <x>". ------------------------------------------------------------------------ [2019-09-02 20:51:30] sinus at sinpi dot net The issue can be seen at http://djab.eu/isuvu/bug.php with source viewable at http://djab.eu/isuvu/bug.php.txt . ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=78485 -- Edit this bug report at https://bugs.php.net/bug.php?id=78485&edit=1