20190809银川联通DBLINK SCN超出ORA-00600[2252]报错

故障现象：
大量ORA-00600错误trace文件，oraclelog目录100%
[oracle@kefudb01 trace]$ cat nxunicom1_ora_57326.trc
Trace file /oracle/app/oracle/diag/rdbms/nxunicom/nxunicom1/trace/nxunicom1_ora_57326.trc
Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production
Build label: RDBMS_12.2.0.1.0_LINUX.X64_170125
ORACLE_HOME: /oracle/app/oracle/product/12.2.0/dbhome_1
System name: Linux
Node name: kefudb01
Release: 3.10.0-327.el7.x86_64
Version: #1 SMP Thu Oct 29 17:29:29 EDT 2015
Machine: x86_64
Instance name: nxunicom1
Redo thread mounted by this instance: 1
Oracle process number: 291
Unix process pid: 57326, image: oracle@kefudb01

*** 2019-08-09T19:05:54.145635+08:00
*** SESSION ID:(880.38712) 2019-08-09T19:05:54.145661+08:00
*** CLIENT ID:() 2019-08-09T19:05:54.145667+08:00
*** SERVICE NAME:(nxunicom) 2019-08-09T19:05:54.145672+08:00
*** MODULE NAME:(JDBC Thin Client) 2019-08-09T19:05:54.145677+08:00
*** ACTION NAME:() 2019-08-09T19:05:54.145682+08:00
*** CLIENT DRIVER:(jdbcthin) 2019-08-09T19:05:54.145686+08:00

2019-08-09T19:05:54.145435+08:00
Incident 100649 created, dump file: /oracle/app/oracle/diag/rdbms/nxunicom/nxunicom1/incident/incdir_100649/nxunicom1_ora_57326_i100649.trc
ORA-00600: 内部错误代码, 参数: [ORA-00600: internal error code, arguments: [2252], [5579], [3398194558], [], [], [], [], []
], [], [], [], [], [], [], [], [], [], [], []
ORA-02063: 紧接着 line (起自 DBLINK_SMS_CL)