#0  0x0000000801e9e4a2 in zend_t_usage (block=0x80cc802f8, op_array=0x801ca4c10, used_ext=0x80ccd7960 "") at ./Optimizer/block_pass.c:1905
1905					if (!defined_here[VAR_NUM(ZEND_RESULT(opline).var)] && !used_ext[VAR_NUM(ZEND_RESULT(opline).var)] &&
(gdb) bt
#0  0x0000000801e9e4a2 in zend_t_usage (block=0x80cc802f8, op_array=0x801ca4c10, used_ext=0x80ccd7960 "") at ./Optimizer/block_pass.c:1905
#1  0x0000000801e99a27 in zend_block_optimization (op_array=0x801ca4c10) at ./Optimizer/block_pass.c:2069
#2  0x0000000801e97b58 in zend_optimize (op_array=0x801ca4c10, script=0x801ca4bf8, constants=0x7fffffffabc0) at ./Optimizer/pass5.c:2
#3  0x0000000801e91ca3 in zend_accel_optimize (op_array=0x801ca4c10, script=0x801ca4bf8, constants=0x7fffffffabc0) at /wrkdirs/usr/ports/www/php56-opcache/work/php-5.6.34/ext/opcache/Optimizer/zend_optimizer.c:586
#4  0x0000000801e91919 in zend_accel_script_optimize (script=0x801ca4bf8) at /wrkdirs/usr/ports/www/php56-opcache/work/php-5.6.34/ext/opcache/Optimizer/zend_optimizer.c:633
#5  0x0000000801e81cef in cache_script_in_shared_memory (new_persistent_script=0x801ca4bf8, key=0x8020aed34 <accel_globals+380> "/usr/local/www/cpos2/index.php", key_length=30, from_shared_memory=0x7fffffffaf68)
    at ZendAccelerator.c:1165
#6  0x0000000801e80790 in compile_and_cache_file (file_handle=0x7fffffffcbf0, type=8, key=0x8020aed34 <accel_globals+380> "/usr/local/www/cpos2/index.php", key_length=30, op_array_p=0x7fffffffaf48,
    from_shared_memory=0x7fffffffaf68) at ZendAccelerator.c:1481
#7  0x0000000801e7f881 in persistent_compile_file (file_handle=0x7fffffffcbf0, type=8) at ZendAccelerator.c:1680
#8  0x00000000006ecf70 in ?? ()
#9  0x0000000800000000 in ?? ()
#10 0x0000000000000000 in ?? ()
(gdb) frame 0
#0  0x0000000801e9e4a2 in zend_t_usage (block=0x80cc802f8, op_array=0x801ca4c10, used_ext=0x80ccd7960 "") at ./Optimizer/block_pass.c:1905
1905					if (!defined_here[VAR_NUM(ZEND_RESULT(opline).var)] && !used_ext[VAR_NUM(ZEND_RESULT(opline).var)] &&
(gdb) l
1900			while (opline<end) {
1901				T_USAGE(opline->op1);
1902				T_USAGE(opline->op2);
1903
1904				if (RESULT_USED(opline)) {
1905					if (!defined_here[VAR_NUM(ZEND_RESULT(opline).var)] && !used_ext[VAR_NUM(ZEND_RESULT(opline).var)] &&
1906					    (opline->opcode == ZEND_RECV || opline->opcode == ZEND_RECV_INIT ||
1907	#if ZEND_EXTENSION_API_NO > PHP_5_5_X_API_NO
1908					     opline->opcode == ZEND_RECV_VARIADIC ||
1909	#endif
(gdb)