On 11/19/2013 05:38 PM, Radoslav Stefanov wrote:
> Does anyone have any clues what could cause them or how to trace this? It seems there is no impact on user experience, no 500 errors or anything, but I would like to know what is happening.

Sure, see here: https://bugs.php.net/bugs-generating-backtrace.php

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Wbr,
Antony Dovgal
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http://pinba.org - realtime profiling for PHP

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