Gather Schema Statistics failing after upgrading DB to 11.2.0.2

Problem:

After upgrading the database to 11.2.0.2, Gather Schema Statistics was failing with following errors in the log file:

Error #1: ERROR: While GATHER_TABLE_STATS:
object_name=GME.GME_BATCH_HEADER***ORA-12805: parallel query server died unexpectedly***

Following errors are observed in alert log as well:

ORA-00600: internal error code, arguments: [kgh_heap_sizes:ds], [0x2B5FAA85D510], [], [], [], [], [], [], [], [], [], []
ORA-07445: exception encountered: core dump [qesaMSR2SorRecMerge()+265] [SIGSEGV] [ADDR:0x30] [PC:0x139B739] [Address not mapped to object] []

ORA-00603: ORACLE server session terminated by fatal error
ORA-24557: error 600 encountered while handling error 600; exiting server process
ORA-00600: internal error code, arguments: [17147], [0x2B4C94C114F8], [], [], [], [], [], [], [], [], [], []
ORA-00600: internal error code, arguments: [17147], [0x2B4C94C114F8], [], [], [], [], [], [], [], [], [], []
ORA-00039: error during periodic action
ORA-00600: internal error code, arguments: [17114], [0x2B4C94C114F8], [], [], [], [], [], [], [], [], [], []
opidrv aborting process P007 ospid (23806) as a result of ORA-603

Fix:
Bug 10013177: FUNCTIONAL INDEX CAUSES MAX DECODE GROUP BY SQL TO TRUNCATE VALUES:

Workaround is:

1) Set _replace_virtual_columns=false

2) Set _disable_function_based_index=true

3) Gathering table stats using degree 1.

Permanent fix is:

Apply Interim patch 10013177