Description:
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When using spl_autoload_register() in combination with session_set_save_handler(), php crashes after loading the page 1-3 times. I want to implement a custom session storage class that stores its data inside the APC cache.

Disabling my autoloader will fix the crash issues but this is not an option for a bigger project depending on the autoloader.

Using single functions instead of a class for the custom session handler fixes the problem too. However I need to implement it as a class.

I've tried tons of different code-snippets, apc-settings etc. but none worked for me. 

Reproduce code:
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See my test script here:

http://pastebin.com/AP0tdCP3


Expected result:
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"foo" should be the output

Actual result:
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php 5.2.17, apache 2.2.11 and apc 3.1.6 were compiled with "gcc -g"

# gdb /usr/local/apache/bin/httpd /tmp/core
(gdb) bt
#0  0x00007f4d6aff95b3 in zif_spl_autoload () from /usr/local/apache/modules/libphp5.so
#1  0x00007f4d756d9790 in ?? ()
#2  0x0000000000000008 in ?? ()
#3  0x00007fffd5a83830 in ?? ()
#4  0x00007f4d6b7baf10 in executor_globals () from /usr/local/apache/modules/libphp5.so
#5  0x00007fffd5a83854 in ?? ()
#6  0x00007fffd5a837e0 in ?? ()
#7  0x00007fffd5a83838 in ?? ()
#8  0x00007f4d75d39e90 in ?? ()
#9  0x0000000000000000 in ?? ()