The following bug has been logged on the website:

Bug reference:      6696
Logged by:          weixing
Email address:      weixing....@gmail.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


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