DB2 instance may crash with a message indicating that we are
attempting to free memory that was already freed. This situation
can occur after several attempts are made to restart the vendor
library. The following symptoms can be found in db2diag.log:
1) more than one attempt to restart vendor library similar to
2014-03-14-05.08.06.035578-240 I691010A392 LEVEL:
Warning
PID : 10158162 TID : 12610 PROC :
db2sysc 0
INSTANCE: db2inst1 NODE : 000
EDUID : 12610 EDUNAME: db2logmgr (SAMPLE) 0
FUNCTION: DB2 UDB, data protection services,
sqlpgRetrieveLogFile, probe:3800
MESSAGE : Retrying log retrieve. Restarting vendor and then
calling retrieve.
2) one last error from vendor library followed by detection of
memory corruption and "double free" message:
2014-03-14-05.08.06.240791-240 I701583A438 LEVEL:
Error
PID : 10158162 TID : 12610 PROC :
db2sysc 0
INSTANCE: db2inst1 NODE : 000
EDUID : 12610 EDUNAME: db2logmgr (SAMPLE) 0
FUNCTION: DB2 UDB, data protection services,
sqlpgRetrieveLogVendor, probe:3600
RETCODE :
ZRC=0x86100024=-2045771740=SQLP_SHRLIB_VENDOR_DEV_ERR
"A vendor device reported a shared library error."
2014-03-14-05.08.06.240947-240 I702022A1616 LEVEL:
Severe
PID : 10158162 TID : 12610 PROC :
db2sysc 0
INSTANCE: db2inst1 NODE : 000
EDUID : 12610 EDUNAME: db2logmgr (SAMPLE) 0
FUNCTION: DB2 UDB, SQO Memory Management,
sqloDiagnoseFreeBlockFailure, probe:10
MESSAGE : Possible memory corruption detected.
DATA #1 : ZRC, PD_TYPE_ZRC, 4 bytes
0x820F0002
DATA #2 : Corrupt block address, PD_TYPE_CORRUPT_BLK_PTR, 8
bytes
0x0700000082e0ffc0
DATA #3 : Block header, PD_TYPE_BLK_HEADER, 24 bytes
0x0700000082E0FFA8 : FAB0 7000 0008 2E00 0000 0000 0000 0000
..p.............
0x0700000082E0FFB8 : 0000 0000 0000 0000
........
DATA #4 : Data header, PD_TYPE_BLK_DATA_HEAD, 48 bytes
0x0700000082E0FFC0 : 0000 0000 0000 0040 0000 0000 0000 0000
.......@........
0x0700000082E0FFD0 : 0000 0000 0000 0000 0000 0000 0000 0000
................
0x0700000082E0FFE0 : 0000 0000 0000 0000 0000 0000 0000 0000
................
CALLSTCK:
[0] 0x09000000053E8F90 pdLog + 0x80
[1] 0x0900000005A8CBA4
@78@sqloDiagnoseFreeBlockFailure__FP8SMemFBlkCb + 0xF4
[2] 0x0900000005A8C9E0
sqloDiagnoseFreeBlockFailure__FP8SMemFBlkCb@glue6D5 + 0x78
[3] 0x090000000573B7C4 sqlofmblkEx + 0x80
[4] 0x09000000054F6044
sqlpTermVendorAPI__FPP15SQLPG_VENDOR_CB + 0x78
[5] 0x090000000799F87C sqlpgRetrieveLogFile__FP9SQLP_DBCB +
0x130C
[6] 0x0900000007999E24
sqlpgHandleLogMgrPost__FP9SQLP_DBCBUi + 0xE54
[7] 0x090000000799804C sqlpgLogManager__FPcUi + 0xCA8
[8] 0x09000000056E2A4C sqloEDUEntry + 0x49C
[9] 0x09000000004FDD30 _pthread_body + 0xF0
2014-03-14-05.08.06.241223-240 I703639A355 LEVEL:
Severe
PID : 10158162 TID : 12610 PROC :
db2sysc 0
INSTANCE: db2inst1 NODE : 000
EDUID : 12610 EDUNAME: db2logmgr (SAMPLE) 0
FUNCTION: DB2 UDB, SQO Memory Management,
sqloDiagnoseFreeBlockFailure, probe:30
DATA #1 : String, 12 bytes
Double free. |
