What does "zend_mm_heap corrupted" mean

Question

All of the sudden I've been having problems with my application that I've never had before. I decided to check the Apache's error log, and I found an error message saying "zend_mm_heap corrupted". What does this mean.

OS: Fedora Core 8 Apache: 2.2.9 PHP: 5.2.6

Answer 1

I have no clue, but you are not alone:

• http://pecl.php.net/bugs/bug.php?id=13511
• http://bugs.php.net/bug.php?id=40479
• http://marc.info/?l=php-internals&m=121749434306671&w=2

Answer 2

For me, it was the ZendDebugger that caused the memory leak and cuased the MemoryManager to crash.

I disabled it and I'm currently searching for a newer version. If I can't find one, I'm going to switch to xdebug...

Answer 3

Because I never found a solution to this I decided to upgrade my LAMP environment. I went to Ubuntu 10.4 LTS with PHP 5.3.x. This seems to have stopped the problem for me.