客户数据库在SHUTDOWN的过程中执行了取消操作，导致了ORA-600错误。
数据库版本为10.2.0.4 RAC for HP-UX，详细错误信息为：
Thu Oct 22 15:05:14 2009
Shutting down instance: further logons disabled
Thu Oct 22 15:05:15 2009
Stopping background process QMNC
Thu Oct 22 15:05:15 2009
Stopping background process CJQ0
Thu Oct 22 15:05:17 2009
Stopping background process MMNL
Thu Oct 22 15:05:18 2009
Stopping background process MMON
Thu Oct 22 15:05:19 2009
Shutting down instance (immediate)
License high water mark = 8
Thu Oct 22 15:05:19 2009
Stopping Job queue slave processes, flags = 7
Thu Oct 22 15:05:19 2009
Job queue slave processes stopped
Thu Oct 22 15:05:20 2009
ALTER DATABASE CLOSE NORMAL
Thu Oct 22 15:05:20 2009
SMON: disabling tx recovery
SMON: disabling cache recovery tb
Thu Oct 22 15:05:21 2009
LGWR: Waiting for ORLs to be archived...
Thu Oct 22 15:05:36 2009
Reconfiguration started (old inc 2, new inc 4)
List of nodes:
0 1
Global Resource Directory frozen
Communication channels reestablished
* domain 0 valid = 1 according to instance 0
Thu Oct 22 15:05:36 2009
Master broadcasted resource hash value bitmaps
Non-local Process blocks cleaned out
Thu Oct 22 15:05:36 2009
LMS 0: 0 GCS shadows cancelled, 0 closed
Thu Oct 22 15:05:36 2009
LMS 1: 0 GCS shadows cancelled, 0 closed
Set master node info
Submitted all remote-enqueue requests
Dwn-cvts replayed, VALBLKs dubious
All grantable enqueues granted
Thu Oct 22 15:05:36 2009
LMS 1: 2008 GCS shadows traversed, 1001 replayed
Thu Oct 22 15:05:36 2009
LMS 0: 1988 GCS shadows traversed, 1034 replayed
Thu Oct 22 15:05:36 2009
Submitted all GCS remote-cache requests
Fix write in gcs resources
Reconfiguration complete
Thu Oct 22 15:05:51 2009
CLOSE: Error 1013 during database close
Thu Oct 22 15:05:51 2009
SMON: enabling cache recovery
SMON: enabling tx recovery
Thu Oct 22 15:05:51 2009
ORA-1013 signalled during: ALTER DATABASE CLOSE NORMAL...
Thu Oct 22 15:05:51 2009
Errors in file /u01/app/oracle/admin/orcl3/bdump/orcl32_lns1_4678.trc:
ORA-00600: internal error code, arguments: [2658], [4], [2], [], [], [], [], []
Thu Oct 22 15:05:52 2009
Trace dumping is performing id=[cdmp_20091022150552]
Thu Oct 22 15:05:52 2009
Errors in file /u01/app/oracle/admin/orcl3/bdump/orcl32_lns1_4678.trc:
ORA-00600: internal error code, arguments: [2658], [4], [2], [], [], [], [], []
Thu Oct 22 15:05:55 2009
LGWR: ORLs successfully archived
Shutting down archive processes
Archiving is disabled
Thu Oct 22 15:06:00 2009
ARCH shutting down
ARC3: Archival stopped
Thu Oct 22 15:06:05 2009
ARCH shutting down
ARC2: Archival stopped
Thu Oct 22 15:06:10 2009
ARCH shutting down
ARC1: Archival stopped
Thu Oct 22 15:06:15 2009
ARCH shutting down
ARC0: Archival stopped
Thu Oct 22 15:06:16 2009
Thread 2 closed at log sequence 23
Successful close of redo thread 2
可以看到，用户在执行了SHUTDOWN IMMEDIATE操作后，执行了CTRL+C取消操作，导致了ORA-1031错误，之后同一时间引发了ORA-600[2658]错误。显然这个错误的产生和用户发出的取消命令直接相关，而且最终这个命令并未生效，数据库成功的被关闭。
在MOS上查询了一下ORA-600[2658]的相关错误，发现多部分错误都出现在7.3和8.1版本上，在9i以后这个错误已经很少见了，从这一点也可以看出，导致这个错误出现的是偶然的因素，那么取消操作显然是导致这个错误的最大可能性。
数据库本身处于关闭过程中，因此这个错误没有影响，可以直接忽略掉。