Description:
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Connecting to an SSL socket stream and trying to read from the stream when it's empty, results in the script hanging with 100% CPU usage until timeout (either socket timeout or PHP max execution time, which ever comes first).

Only environment where I (and others) have been able to reproduce this is PHP 5.6.7 on Ubuntu 14.04. I have tested on few CentOS servers with PHP 5.4, 5.5 and 5.6 and they all work fine. Also on a Debian server with PHP 5.4 the same script works fine.

More info here: https://github.com/zendframework/ZendService_Apple_Apns/issues/19

Test script:
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Unfortunately I haven't been able to reproduce this without a valid SSL stream so the example code requires a connection to Apple APNS sandbox server and a valid local certificate provided by Apple (which I obviously cannot share). If anyone knows how this kind of connection could be established in a more generic and easily reproducible way, that would be great.

https://gist.github.com/cvuorinen/1640b1a8ff2a7a19dd8e

Expected result:
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string(0) ""

Actual result:
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Fatal error: Maximum execution time of 10 seconds exceeded in /tmp/stream_test.php on line 27

Call Stack:
    0.0001     233600   1. {main}() /tmp/stream_test.php:0
    0.4907     236528   2. fread() /tmp/stream_test.php:27