Description:
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setrawcookie seems to be the cause of this bug but it actually requires a couple things to trigger. The rawurlencode and the PDO statement seem required.

I'm not sure how to get gdb working right with php-fpm where I triggered this bug. Because of the cookie involved it obviously doesn't work from the command line though.

Test script:
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<?php

setrawcookie('cookie', rawurlencode('value'), $_SERVER['REQUEST_TIME'] + 31536000, '/');
$dbh = new PDO('mysql:host=localhost;dbname=data', 'root', '');


Expected result:
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cookie is set

Actual result:
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502 response and SIGSEGV in log