PayPal IPN keeps retrying

#1
Hi, my script, for some reason does not seem to be outputting the information to paypal (but it still goes through so everything that should happen, do happen), and therefore paypal keeps continuing to send IPN requests, which leaves me much cleanup work.

I got hold of the stderr.log and I found the following:

2011-06-01 21:48:29.905 [STDERR] *** glibc detected *** lsphp5:me/litespeed/www/scripts/pp/cakecraft_ipn.php: double free or corruption (fasttop): 0x000000001ffc5b90 ***
2011-06-01 21:48:29.906 [STDERR] ======= Backtrace: =========
2011-06-01 21:48:29.906 [STDERR] /lib64/libc.so.6[0x2b241c9df45f]
2011-06-01 21:48:29.906 [STDERR] /lib64/libc.so.6(cfree+0x4b)[0x2b241c9df8bb]
2011-06-01 21:48:29.906 [STDERR] lsphp5:me/litespeed/www/scripts/pp/cakecraft_ipn.php[0x6b1c39]
2011-06-01 21:48:29.906 [STDERR] lsphp5:me/litespeed/www/scripts/pp/cakecraft_ipn.php(zend_error+0x4fc)[0x7012dc]
2011-06-01 21:48:29.906 [STDERR] /lib64/libc.so.6[0x2b241c99d2d0]
2011-06-01 21:48:29.906 [STDERR] /lib64/libc.so.6(memcpy+0x16)[0x2b241c9e9256]
2011-06-01 21:48:29.906 [STDERR] lsphp5:me/litespeed/www/scripts/pp/cakecraft_ipn.php[0x6b1c6a]
2011-06-01 21:48:29.906 [STDERR] lsphp5:me/litespeed/www/scripts/pp/cakecraft_ipn.php(zend_error+0x4fc)[0x7012dc]
2011-06-01 21:48:29.906 [STDERR] lsphp5:me/litespeed/www/scripts/pp/cakecraft_ipn.php(zend_fetch_resource+0x196)[0x70f176]
2011-06-01 21:48:29.906 [STDERR] lsphp5:me/litespeed/www/scripts/pp/cakecraft_ipn.php(zif_feof+0x5d)[0x6591bd]
2011-06-01 21:48:29.906 [STDERR] lsphp5:me/litespeed/www/scripts/pp/cakecraft_ipn.php[0x74d139]
2011-06-01 21:48:29.906 [STDERR] lsphp5:me/litespeed/www/scripts/pp/cakecraft_ipn.php(execute+0x1bc)[0x724c6c]
2011-06-01 21:48:29.906 [STDERR] lsphp5:me/litespeed/www/scripts/pp/cakecraft_ipn.php(zend_execute_scripts+0x10d)[0x70019d]
2011-06-01 21:48:29.906 [STDERR] lsphp5:me/litespeed/www/scripts/pp/cakecraft_ipn.php(php_execute_script+0x18d)[0x6af60d]
2011-06-01 21:48:29.906 [STDERR] lsphp5:me/litespeed/www/scripts/pp/cakecraft_ipn.php[0x7861f7]
2011-06-01 21:48:29.906 [STDERR] lsphp5:me/litespeed/www/scripts/pp/cakecraft_ipn.php[0x786611]
2011-06-01 21:48:29.906 [STDERR] lsphp5:me/litespeed/www/scripts/pp/cakecraft_ipn.php[0x786885]
2011-06-01 21:48:29.906 [STDERR] /lib64/libc.so.6(__libc_start_main+0xf4)[0x2b241c98a994]
2011-06-01 21:48:29.906 [STDERR] lsphp5:me/litespeed/www/scripts/pp/cakecraft_ipn.php(xmlTextReaderConstName+0x119)[0x428b69]
Any heads up on what to look for/install/change would be much appreciated! :)
 
#3
Any recommended versions? The one I tried was 5.3.4 with Suhosin patch. I am currently trying 5.3.6.

Edit: Tried again with 5.2.17, no luck. Script has ran 4 times now. :( What's annoying is that there are nothing in stderr.log anymore, the errors simply disappeared yet it does not work. Perhaps something could be up with SSL.

edit2: Nope, port 443 (SSL) is reported open and it works when we visit our site using HTTPS.
 
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