执行yum update出现Cannot allocate memory错误

CentOS 6在进行yum update后出现如下错误，Error in POSTIN scriptlet in rpm package libstdc++-4.4.7-23.el6.x86_64 error: Couldn't fork %post(libstdc++-4.4.7-23.el6.x86_64): Cannot allocate memory Updating...