Exited on signal 11 (nginx + php-fpm) -

i'm creating php script. script receive post data , process it.

i found error in /var/log/php5-fpm.log

[11-may-2015 15:34:03] warning: [pool www] child 2553 exited on signal 11 (sigsegv - core dumped) after 6943.521858 seconds start [11-may-2015 15:34:03] notice: [pool www] child 3882 started 

core dumps:

warning: can't read pathname load map: input/output error. [thread debugging using libthread_db enabled] using host libthread_db library "/lib/i386-linux gnu/libthread_db.so.1". core generated `                                   '. program terminated signal 11, segmentation fault. #0  0x083dce46 in ?? () 

gdb backtrace:

#0  0x083dce46 in ?? () #1  0x083e5074 in ?? () #2  0x083ed718 in ?? ()  #3  0x083e494f in ?? () #4  0x082c1df1 in php_log_err () #5  0x082c226e in ?? () #6  0x081c13cb in ?? () #7  0x0832a7b7 in zend_error () #8  0x083b7ff6 in ?? () #9  0x083b921f in ?? () #10 0x083957a5 in execute () #11 0x0832b5f9 in zend_execute_scripts () #12 0x082c510e in php_execute_script () #13 0x0806c052 in ?? () #14 0x00000000 in ?? () 

nginx version: nginx/1.6.1

php version: php 5.4.32-2(built: aug 25 2014 11:02:49)

can me? in advance

do have more information system? input/output error not news , first thing comes mind harddisk failing.