php-fpm killed by SIGSEGV

Issue

• Below is the GDB stacktrace of the core generated with above SIGSEGV signal, :

(gdb) bt
#0  ZEND_FETCH_CONSTANT_SPEC_UNUSED_CONST_HANDLER (execute_data=0x7f4bc9cbb6c0) at /usr/src/debug/php-5.6.25/Zend/zend_vm_execute.h:25703
#1  0x00005602f8bb1d38 in execute_ex (execute_data=0x7f4bc9cbb6c0) at /usr/src/debug/php-5.6.25/Zend/zend_vm_execute.h:363
#2  0x00005602f8b63379 in dtrace_execute_ex (execute_data=<optimized out>) at /usr/src/debug/php-5.6.25/Zend/zend_dtrace.c:73
#3  0x00005602f8c1e5c9 in zend_do_fcall_common_helper_SPEC (execute_data=<optimized out>) at /usr/src/debug/php-5.6.25/Zend/zend_vm_execute.h:592
#4  0x00005602f8bb1d38 in execute_ex (execute_data=0x7f4bc9cbb578) at /usr/src/debug/php-5.6.25/Zend/zend_vm_execute.h:363
#5  0x00005602f8b63379 in dtrace_execute_ex (execute_data=<optimized out>) at /usr/src/debug/php-5.6.25/Zend/zend_dtrace.c:73
#6  0x00005602f8c1e5c9 in zend_do_fcall_common_helper_SPEC (execute_data=<optimized out>) at /usr/src/debug/php-5.6.25/Zend/zend_vm_execute.h:592
#7  0x00005602f8bb1d38 in execute_ex (execute_data=0x7f4bc9cbb438) at /usr/src/debug/php-5.6.25/Zend/zend_vm_execute.h:363
#8  0x00005602f8b63379 in dtrace_execute_ex (execute_data=<optimized out>) at /usr/src/debug/php-5.6.25/Zend/zend_dtrace.c:73
#9  0x00005602f8c1e5c9 in zend_do_fcall_common_helper_SPEC (execute_data=<optimized out>) at /usr/src/debug/php-5.6.25/Zend/zend_vm_execute.h:592
#10 0x00005602f8bb1d38 in execute_ex (execute_data=0x7f4bc9cbb320) at /usr/src/debug/php-5.6.25/Zend/zend_vm_execute.h:363
#11 0x00005602f8b63379 in dtrace_execute_ex (execute_data=<optimized out>) at /usr/src/debug/php-5.6.25/Zend/zend_dtrace.c:73
#12 0x00005602f8c1e5c9 in zend_do_fcall_common_helper_SPEC (execute_data=<optimized out>) at /usr/src/debug/php-5.6.25/Zend/zend_vm_execute.h:592
#13 0x00005602f8bb1d38 in execute_ex (execute_data=0x7f4bc9cbb068) at /usr/src/debug/php-5.6.25/Zend/zend_vm_execute.h:363
#14 0x00005602f8b63379 in dtrace_execute_ex (execute_data=<optimized out>) at /usr/src/debug/php-5.6.25/Zend/zend_dtrace.c:73
#15 0x00005602f8c1e5c9 in zend_do_fcall_common_helper_SPEC (execute_data=<optimized out>) at /usr/src/debug/php-5.6.25/Zend/zend_vm_execute.h:592
#16 0x00005602f8bb1d38 in execute_ex (execute_data=0x7f4bc9cbada0) at /usr/src/debug/php-5.6.25/Zend/zend_vm_execute.h:363
#17 0x00005602f8b63379 in dtrace_execute_ex (execute_data=<optimized out>) at /usr/src/debug/php-5.6.25/Zend/zend_dtrace.c:73
#18 0x00005602f8c1e5c9 in zend_do_fcall_common_helper_SPEC (execute_data=<optimized out>) at /usr/src/debug/php-5.6.25/Zend/zend_vm_execute.h:592
#19 0x00005602f8bb1d38 in execute_ex (execute_data=0x7f4bc9cbac70) at /usr/src/debug/php-5.6.25/Zend/zend_vm_execute.h:363
#20 0x00005602f8b63379 in dtrace_execute_ex (execute_data=<optimized out>) at /usr/src/debug/php-5.6.25/Zend/zend_dtrace.c:73
#21 0x00005602f8c1d992 in ZEND_INCLUDE_OR_EVAL_SPEC_CONST_HANDLER (execute_data=0x7f4bc9cbab68) at /usr/src/debug/php-5.6.25/Zend/zend_vm_execute.h:3026
#22 0x00005602f8bb1d38 in execute_ex (execute_data=0x7f4bc9cbab68) at /usr/src/debug/php-5.6.25/Zend/zend_vm_execute.h:363
#23 0x00005602f8b63379 in dtrace_execute_ex (execute_data=<optimized out>) at /usr/src/debug/php-5.6.25/Zend/zend_dtrace.c:73
#24 0x00005602f8c1d992 in ZEND_INCLUDE_OR_EVAL_SPEC_CONST_HANDLER (execute_data=0x7f4bc9cbaaa0) at /usr/src/debug/php-5.6.25/Zend/zend_vm_execute.h:3026
#25 0x00005602f8bb1d38 in execute_ex (execute_data=0x7f4bc9cbaaa0) at /usr/src/debug/php-5.6.25/Zend/zend_vm_execute.h:363
#26 0x00005602f8b63379 in dtrace_execute_ex (execute_data=<optimized out>) at /usr/src/debug/php-5.6.25/Zend/zend_dtrace.c:73
#27 0x00005602f8b7648b in zend_execute_scripts (type=type@entry=8, retval=retval@entry=0x0, file_count=file_count@entry=3) at /usr/src/debug/php-5.6.25/Zend/zend.c:1341
#28 0x00005602f8b11072 in php_execute_script (primary_file=primary_file@entry=0x7ffeb36ccf90) at /usr/src/debug/php-5.6.25/main/main.c:2613
#29 0x00005602f89f08bf in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/php-5.6.25/sapi/fpm/fpm/fpm_main.c:1989