BUG #6696: 9.2beta2 crashed when having shared_buffers>20GB

The following bug has been logged on the website:

Bug reference: 6696
Logged by: weixing
Email address: weixing(dot)sun(at)gmail(dot)com
PostgreSQL version: Unsupported/Unknown
Operating system: RHEL6.1
Description:

Hi,

I know this NON-GA version issue could not be placed here, but please let me
know if you have any entries.
Currently , I met a tricky bug of Postgres 9.2beta2 when having > 20GB
buffer pool:
###################################
DETAIL: The postmaster has commanded this server process to roll back the
current transaction and exit,
because another server process exited abnormally and possibly corrupted
shared memory.
HINT: In a moment you should be able to reconnect to the database and
repeat your command.
WARNING: terminating connection because of crash of another server process
################################
Above err msg will fill out my stderr log file, and refuse all the requests
from the middle-tier of running my workload.

Any comments?

Thanks a lot!
Weixing