[oracle@CW-DB ~]$ tail -f /oracle/admin/rrlcw/bdump/alert_rrlcw.log
Fri Sep 5 12:35:39 2008
Starting background process EMN0
EMN0 started with pid=18, OS id=26065
Fri Sep 5 12:35:39 2008
Shutting down instance: further logons disabled
Fri Sep 5 12:35:39 2008
Stopping background process CJQ0
Fri Sep 5 12:35:39 2008
Stopping background process QMNC
Fri Sep 5 12:35:41 2008
Stopping background process MMNL
Fri Sep 5 12:35:42 2008
Stopping background process MMON
Fri Sep 5 12:35:44 2008
Shutting down instance (immediate)
License high water mark = 334
Fri Sep 5 12:35:44 2008
Stopping Job queue slave processes
Fri Sep 5 12:35:44 2008
Job queue slave processes stopped
All dispatchers and shared servers shutdown
Fri Sep 5 12:35:55 2008
PMON failed to acquire latch, see PMON dump
PMON failed to acquire latch, see PMON dump
PMON failed to acquire latch, see PMON dump
PMON failed to acquire latch, see PMON dump

部分dump文件：
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bit Production
With the Partitioning, OLAP and Data Mining options
ORACLE_HOME = /oracle/product/10.2/db_1
System name: Linux
Node name: CW-DB
Release: 2.6.18-53.el5
Version: #1 SMP Wed Oct 10 16:34:19 EDT 2007
Machine: x86_64
Instance name: rrlcw
Redo thread mounted by this instance: 1
Oracle process number: 16
Unix process pid: 16553, image: oracle@CW-DB (ARC0)

*** SERVICE NAME:() 2008-07-03 17:46:29.222
*** SESSION ID:(1641.1) 2008-07-03 17:46:29.222
kcrrwkx: nothing to do (start)
*** 2008-07-03 17:47:29.136
kcrrwkx: nothing to do (end)
*** 2008-07-03 17:48:29.150
kcrrwkx: nothing to do (end)
*** 2008-07-03 17:49:29.164
kcrrwkx: nothing to do (end)
*** 2008-07-03 17:50:29.177
kcrrwkx: nothing to do (end)
*** 2008-07-03 17:51:29.191
kcrrwkx: nothing to do (end)
*** 2008-07-03 17:52:29.202
tkcrrxmp: Stopping ARC2 to reduce ARCH processes from 3 to 2
kcrrwkx: nothing to do (end)
*** 2008-07-03 17:53:34.224

最后shutdown abort了，重启之后正常。

看网上说的好像是个bug.