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[PHP] Segmenation fault

Hi List!

I am working on a CLI script (PHP 5.5.25) that parses and imports large amounts of data into a database. Usually, the script runs for 5-15 minutes. For the most part, the script is working just fine. But for some reason, it seems to hit some limit and PHP crashes with a segmentation fault. I managed to hook GDB to the PHP process and got a backtrace. Unfortunately, I am not so much wiser than before. 

Can someone be so kind and point me into the right direction and give me a hint why PHP crashes? The backtrace:

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x0000000000000018
0x000000010e8f416f in zend_signal_handler_unblock ()
(gdb) bt
#0  0x000000010e8f416f in zend_signal_handler_unblock ()
#1  0x000000010e8b47d5 in _zend_mm_alloc_int ()
#2  0x000000010e884cd4 in vspprintf ()
#3  0x000000010f5e112f in xdebug_error_cb ()
#4  0x000000010e8d5875 in zend_error ()
#5  0x000000010e8f4121 in zend_signal_handler ()
#6  0x000000010e8f3fae in zend_signal_handler_defer ()
#7  <signal handler called>
#8  0x00007fff855fce9a in write$NOCANCEL ()
#9  0x00007fff8fae8970 in _swrite ()
#10 0x00007fff8fae15e9 in __sflush ()

I have already tried to give PHP more memory (512MB) but that had no impact on the segmentation fault. Any ideas?

Thank you!
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