[Oracle] opiodr aborting process unknown ospid (***) as a result of ORA-609

今天线上数据库（版本11.2.0.1）无法建立新连接，但原有的连接不受影响，alert.log报如下错误：

opiodr aborting process unknown ospid (22997) as a result of ORA-609

但在listener.log里却显示连接已建立

03-APR-2014 16:05:44 * (CONNECT_DATA=(SERVICE_NAME=orcl2.localdomain)(CID=(PROGRAM=python@lx151)(HOST=lx151)(USER=gl))) * (ADDRESS=(PROTOCOL=tcp)(HOST=10.10.100.151)(PORT=52903)) *establish * orcl2.localdomain * 0

在sqlnet.log里报12537错误

Fatal NI connect error 12537, connecting to:
 (LOCAL=NO)
  VERSION INFORMATION:
        TNS for Linux: Version 11.2.0.1.0 - Production
        Oracle Bequeath NT Protocol Adapter for Linux: Version 11.2.0.1.0 - Production
        TCP/IP NT Protocol Adapter for Linux: Version 11.2.0.1.0 - Production
  Time: 03-APR-2014 15:24:30
  Tracing not turned on.
  Tns error struct:
    ns main err code: 12537
    TNS-12537: TNS:connection closed
    ns secondary err code: 12560
    nt main err code: 0
    nt secondary err code: 0

当用lsnrctl status查看监听器状态时，卡住

通过查询官方文档，知道这是个bug，后来根据网上搜索的解决办法，链接：http://forums.oracle.com/forums/thread.jspa?messageID=4489745

删除主机文件/etc/resolv.conf，果然恢复了，具体原因不清楚，这只是一个临时的解决办法，要想彻底解决，应该要升级。