执行composer网站就502

php-fpm 的错误日志

[30-Dec-2015 23:34:47] WARNING: [pool www] child 5803 exited on signal 11 (SIGSEGV) after 268.707072 seconds from start
[30-Dec-2015 23:35:04] WARNING: [pool www] child 6051 exited on signal 11 (SIGSEGV) after 11.630811 seconds from start

php -v

PHP 5.6.16 (cli) (built: Dec 30 2015 18:26:56)
Copyright (c) 1997-2015 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2015 Zend Technologies
 with XCache v3.2.0, Copyright (c) 2005-2014, by mOo
 with the ionCube PHP Loader v4.7.5, Copyright (c) 2002-2014, by ionCube Ltd., and
 with Zend Guard Loader v3.3, Copyright (c) 1998-2014, by Zend Technologies
 with XCache Optimizer v3.2.0, Copyright (c) 2005-2014, by mOo
 with XCache Cacher v3.2.0, Copyright (c) 2005-2014, by mOo
 with XCache Coverager v3.2.0, Copyright (c) 2005-2014, by mOo