ORA-07445: exception encountered: core dump [drumcmf()+184] [SIGSEGV]

We got this error in one of our Production instances whenever we ran Gather Schema Statistics program:

Errors in Database alert log:
$ORACLE_HOME/admin/$CONTEXT_NAME/udump/$TWO_TASK_ora_13052.trc:
ORA-07445: exception encountered: core dump [drumcmf()+184] [SIGSEGV] [Address
not mapped to object] [0x000000000] [] []

Trace file:
ORA-07445: exception encountered: core dump [drumcmf()+184] [SIGSEGV] [Address not mapped to object]
[0x000000000] [] []
Current SQL statement for this session:
begin :retval := "CTXSYS"."TEXTOPTSTATS".ODCIStatsCollect(:idx_info,:stat_opt,:stats,:env);
end;
----- PL/SQL Call Stack -----
object line object
handle number name
3b1247878 6 CTXSYS.TEXTOPTSTATS
3b1688f20 1 anonymous block
3b144c860 3379 package body SYS.DBMS_STATS
3b144c860 3639 package body SYS.DBMS_STATS
3b144c860 10584 package body SYS.DBMS_STATS
3b144c860 13153 package body SYS.DBMS_STATS
3b144c860 13202 package body SYS.DBMS_STATS
3a7244100 1 anonymous block
3b11b3e38 676 package body APPS.FND_STATS
3b11b3e38 1487 package body APPS.FND_STATS
3b11b3e38 1004 package body APPS.FND_STATS
3b11b3e38 782 package body APPS.FND_STATS
3c197dab0 1 anonymous block

We had an SR logged with Oracle for this. They noticed that we were not passing estimate percent which defaults to 10%. They asked us to explicitly give estimate percent as 30% and run GSS. The issue was resolved after this. From the SR:

ISSUE CLARIFICATION
====================

Gather Schema Statistics concurrent program issue for ' All ' schemas : it completes with error.


ISSUE VERIFICATION
===================
Verified the issue by the alert log file and trace file , which displays :

ORA-07445: exception encountered: core dump [drumcmf()+184] [SIGSEGV] [Address not mapped to object] [0x000000000]" errors are encountered with core dumps.


CAUSE DETERMINATION
====================
Parameters to run Gather Shema Statistics are incorrect.

CAUSE JUSTIFICATION
====================
The following parameters are set as fillow :

GATHER OPTIONS: GATHER AUTO
Estimate Percent: 10


.
PROPOSED SOLUTION(S)
======================
GATHER OPTIONS: GATHER
Estimate Percent: 30


PROPOSED SOLUTION JUSTIFICATION(S)
====================================
GATHER AUTO : If underlying tables are not in monitoring mode , then "Gather Auto" option will try to change it. Since this is a DDL statement, it requires an exclusive lock on the table. If
table is under heavy load and frequently accessed , then this might take a while.
Note : 331017.1


Estimate Percent : Note.141532.1

Percentage of rows to estimate. If left empty it will default to 10%. The valid range is 0-99. A higher percentage will be more accurate, but take longer to run. If the object(s) that you
are gathering statistics for do not change often or the object(s) has data entered that is very similiar you may choose a lower number. However, if the data changes frequently a larger number entered for this parameter would be recommended to provide a more accurate representation of your data.

SOLUTION / ACTION PLAN
=======================
To implement the solution, please execute the following steps:

1. Schema Name: ALL
Estimate Percent: 30
Backup Flag : NOBACKUP
HISTORY MODE: LAST RUN
GATHER OPTIONS: GATHER
Invalidate Dependent Cursors: Y (Yes)


2. References :
Note. 141532.1 ' How To Gather Schema Statistics for Oracle Applications 11i '
Note. 331017.1 ' Gather Schema Statistics program hangs or fails with ORA-54 error '