zend_mm_heap corrupted and Error in `php': double free or corruption (fasttop) running cron.php

[raatt]

WHMCS 6.1.1 and PHP 5.6.14

Whenever cron escalations runs, I get zend_mm_heap corrupted. If I use export USE_ZEND_ALLOC=0, I get the error included below. The regular cron.php works fine, only escalations crashes.

I've tried adding this to php.ini, without results:

output_buffering = On

zend.enable_gc = 0

assert.active = 0

 

*** Error in `php': double free or corruption (fasttop): 0x000000000354cd30 ***
======= Backtrace: =========
/usr/lib64/libc.so.6(+0x7d1fd)[0x7fd7afbbf1fd]
php(_efree+0x36)[0x96da3d]
php(destroy_op_array+0x74)[0x994bea]
php(destroy_zend_function+0x2c)[0x99418c]
php(zend_function_dtor+0x18)[0x9941a9]
php[0x9b53d8]
php(zend_hash_reverse_apply+0x93)[0x9b72c5]
php[0x98e4df]
php(zend_deactivate+0x85)[0x9a4cb3]
php(php_request_shutdown+0x38e)[0x91761d]
php[0xacb87d]
/usr/lib64/libc.so.6(__libc_start_main+0xf5)[0x7fd7afb63af5]
php[0x44b4a9]

Edited November 3, 2015 by raatt