惜分飞

有一个客户找到我们,说他们是数据库启动之时报的错误和数据库不能open 报ORA-7445 lmebucp错类似,让我们对其进行恢复支持,通过分析确定客户数据库版本为12.2.0.1

Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Productio
PL/SQL Release 12.2.0.1.0 - Production	
CORE 12.2.0.1.0 Production	
TNS for Linux: Version 12.2.0.1.0 - Production	
NLSRTL Version 12.2.0.1.0 - Production	

alert日志报错

--最初报错
2020-05-11T03:43:06.787164+08:00
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_m004_3253.trc  (incident=639048):
ORA-00600: 内部错误代码, 参数: [kkpo_rcinfo_defstg:delseg], [72280], [], [], [], [], [], [], [], [], [], []
Incident details in: /u01/app/oracle/diag/rdbms/orcl/orcl/incident/incdir_639048/orcl_m004_3253_i639048.trc
Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
2020-05-11T03:43:14.250993+08:00
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_m004_3253.trc  (incident=639049):
ORA-00600: 内部错误代码, 参数: [kkpo_rcinfo_defstg:delseg], [72280], [], [], [], [], [], [], [], [], [], []
Incident details in: /u01/app/oracle/diag/rdbms/orcl/orcl/incident/incdir_639049/orcl_m004_3253_i639049.trc
2020-05-11T03:43:21.286310+08:00
Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_m004_3253.trc  (incident=639050):
ORA-00600: 内部错误代码, 参数: [kkpo_rcinfo_defstg:delseg], [72280], [], [], [], [], [], [], [], [], [], []
ORA-06512: 在 line 2
Incident details in: /u01/app/oracle/diag/rdbms/orcl/orcl/incident/incdir_639050/orcl_m004_3253_i639050.trc
2020-05-11T03:43:28.059048+08:00
Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
2020-05-11T03:43:28.074681+08:00
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_m004_3253.trc:
ORA-00600: 内部错误代码, 参数: [kkpo_rcinfo_defstg:delseg], [72280], [], [], [], [], [], [], [], [], [], []
ORA-06512: 在 line 2
2020-05-11T08:31:22.416087+08:00
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_j000_16511.trc:
ORA-12012: 自动执行作业 141 出错
ORA-30732: 表中不包含用户可见的列
ORA-06512: 在 line 1


---关闭数据库之后重启报错
2020-05-11T09:42:43.234769+08:00
ALTER DATABASE OPEN
2020-05-11T09:42:44.353085+08:00
Ping without log force is disabled:
  instance mounted in exclusive mode.
Endian type of dictionary set to little
2020-05-11T09:42:44.660388+08:00
TT00: Gap Manager starting (PID:31134)
2020-05-11T09:42:45.180876+08:00
Thread 1 opened at log sequence 78596
  Current log# 2 seq# 78596 mem# 0: /u01/app/oracle/oradata/orcl/redo02.log
Successful open of redo thread 1
2020-05-11T09:42:45.181357+08:00
MTTR advisory is disabled because FAST_START_MTTR_TARGET is not set
Exception [type: SIGSEGV, Address not mapped to object][ADDR:0x0][PC:0x10F4C112, lmebucp()+34][flags: 0x0, count: 1]
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_31125.trc  (incident=646445):
ORA-07445: exception encountered:core dump[lmebucp()+34][SIGSEGV][ADDR:0x0][PC:0x10F4C112][Address not mapped to object]
Incident details in: /u01/app/oracle/diag/rdbms/orcl/orcl/incident/incdir_646445/orcl_ora_31125_i646445.trc
Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
2020-05-11T09:42:46.070049+08:00
*****************************************************************
An internal routine has requested a dump of selected redo.
This usually happens following a specific internal error, when
analysis of the redo logs will help Oracle Support with the
diagnosis.
It is recommended that you retain all the redo logs generated (by
all the instances) during the past 12 hours, in case additional
redo dumps are required to help with the diagnosis.
*****************************************************************
2020-05-11T09:42:53.344955+08:00
Instance Critical Process (pid: 41, ospid: 31125) died unexpectedly
PMON (ospid: 31026): terminating the instance due to error 12752
2020-05-11T09:42:53.377209+08:00
System state dump requested by (instance=1, osid=31026 (PMON)), summary=[abnormal instance termination].
System State dumped to trace file /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_diag_31046_20200511094253.trc
2020-05-11T09:42:56.690224+08:00
Instance terminated by PMON, pid = 31026

对启动过程做10046跟踪

PARSING IN CURSOR #139821999713040 len=65 dep=1 uid=0 oct=3 lid=0 
tim=2200910467 hv=1762642493 ad='1bfd79130'sqlid='aps3qh1nhzkjx'
select line#, sql_text from bootstrap$ where obj# not in (:1, :2)
END OF STMT
PARSE #139821999713040:c=378,e=378,p=0,cr=0,cu=0,mis=1,r=0,dep=1,og=4,plh=0,tim=2200910467
BINDS #139821999713040:

 Bind#0
  oacdty=02 mxl=22(22) mxlc=00 mal=00 scl=00 pre=00
  oacflg=08 fl2=1000001 frm=00 csi=00 siz=24 off=0
  kxsbbbfp=7f2ad89fe6c8  bln=22  avl=02  flg=05
  value=59
 Bind#1
  oacdty=02 mxl=22(22) mxlc=00 mal=00 scl=00 pre=00
  oacflg=08 fl2=1000001 frm=00 csi=00 siz=24 off=0
  kxsbbbfp=7f2ad89fe698  bln=24  avl=06  flg=05
  value=4294967295
EXEC #139821999713040:c=219,e=658,p=0,cr=0,cu=0,mis=1,r=0,dep=1,og=4,plh=867914364,tim=2200911218
WAIT #139821999713040: nam='db file sequential read' ela= 9 file#=1 block#=520 blocks=1 obj#=59 tim=2200911300
WAIT #139821999713040: nam='db file scattered read' ela= 19 file#=1 block#=521 blocks=3 obj#=59 tim=2200911559
FETCH #139821999713040:c=404,e=404,p=4,cr=5,cu=0,mis=0,r=0,dep=1,og=4,plh=867914364,tim=2200911646
STAT #139821999713040 id=1 cnt=0 pid=0 pos=1 obj=59 op='TABLE ACCESS FULL BOOTSTRAP$ (cr=5 pr=4 pw=0 str=1 time=406 us)'

*** 2020-05-11T12:25:30.977832+08:00
Exception [type: SIGSEGV, Address not mapped to object] [ADDR:0x0] [PC:0x10F4C112, lmebucp()+34] [flags: 0x0, count: 1]
2020-05-11T12:25:31.026914+08:00
Incident 718445 created, dump file:/u01/app/oracle/diag/rdbms/orcl/orcl/incident/incdir_718445/orcl_ora_14324_i718445.trc
ORA-07445: exception encountered:core dump [lmebucp()+34][SIGSEGV][ADDR:0x0][PC:0x10F4C112][Address not mapped to object]

根据该报错,可以大概定位数据库重启之后报ORA-07445 lmebucp()+34错误不能正常启动是由于bootstrap$表异常导致.

BBED> p kcvfhrdb
ub4 kcvfhrdb                                @96       0x00400208

BBED> set block 523
        BLOCK#          523

BBED> map
 File: F:\temp\12.2\1\system01.dbf (0)
 Block: 523                                   Dba:0x00000000
------------------------------------------------------------
 KTB Data Block (Table/Cluster)

 struct kcbh, 20 bytes                      @0

 struct ktbbh, 48 bytes                     @20

 struct kdbh, 14 bytes                      @68

 struct kdbt[1], 4 bytes                    @82

 sb2 kdbr[20]                               @86

 ub1 freespace[1015]                        @126

 ub1 rowdata[7047]                          @1141

 ub4 tailchk                                @8188

BBED> p *kdbr[1]
rowdata[6431]
-------------
ub1 rowdata[6431]                           @7572     0x3c

BBED> x /rnnc
rowdata[6431]                               @7572
-------------
flag@7572: 0x3c (KDRHFL, KDRHFF, KDRHFD, KDRHFH)
lock@7573: 0x01
cols@7574:    0

通过bbed定位rootdba,然后dump相关block,随机找一条记录,确认bootstrap表无后效记录.但是该数据库在重启之前已经报了ORA-600 kkpo_rcinfo_defstg:delseg和ORA-30732错误,很可能还有其他的基表异常.通过先修复bootstrap$记录,然后根据该表中记录分析其他相关表记录,最终确定tab$中记录也异常,通过bbed 批量循环修复方法,对其进行恢复,open数据库,可以验证数据没有问题.至此该问题解决,但是没有找出来故障原因(是人为破坏【直接人工删除】,还是某种工具带入恶意脚本导致,类似:plsql dev引起的数据库被黑勒索比特币实现原理分析和解决方案,亦或者是数据库安装介质带有恶意程序,类似:警告：互联网中有oracle介质被注入恶意程序导致—ORA-600 16703)