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Sentry Issue: ENGINE-HF

ErrorException: Allowed memory size of 134217728 bytes exhausted (tried to allocate 116526568 bytes)
  File "/lib/elgglib.php", line 947, in fatalErrorShutdownHandler
    \Sentry\captureLastError();
  File "[internal]", line 0

added scoped labels

Example request: https://www.minds.com/fs/v1/thumbnail/1026508015016828928/xlarge

Link to media page: https://www.minds.com/media/1026508015016828928

Offending section of code in /api/v1/thumbnail.php:

            try {
                $finfo = new \finfo(FILEINFO_MIME);
                $contentType = $finfo->buffer($contents) ?: 'image/jpeg';
            } catch (\Exception $e) {
                error_log($e);
                $contentType = 'image/jpeg';
            }

Issue appears related to finfo under PHP 7.3.

Running a referenced test script show the clear performance degradation between our 7.1 and 7.3 builds when calling finfo.

While I'm not able to reproduce the OOM condition in our sandbox, I am able to demonstrate the performance degradation.

PHP 7.1

/var/www/Minds/engine # ITERS=100 php test.php
Took: 0.094574928283691
/var/www/Minds/engine # ITERS=1000 php test.php
Took: 0.91444492340088

PHP 7.3

/var/www/Minds/engine # ITERS=100 php test.php
Took: 0.42086601257324
/var/www/Minds/engine # ITERS=1000 php test.php
Took: 4.215017080307

Likely this is a good place to start looking for the OOM issue.