incorrect checksum detected on "global/pg_filenode.map" when VACUUM FULL is executed

From: Tatsuki Kadomoto <tatsuki(dot)kadomoto(at)proceranetworks(dot)com>
To: "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org>
Subject: incorrect checksum detected on "global/pg_filenode.map" when VACUUM FULL is executed
Date: 2016-08-22 03:27:32
Message-ID: BN6PR08MB2658CFCDFFB92B7F5BF1355293E80@BN6PR08MB2658.namprd08.prod.outlook.com
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Hello,

I see incorrect checksum detected on "global/pg_filenode.map" when "VACUUM FULL" is executed.

The error message didn't repeat. It showed up only once.

Is this expected? Can someone give me a plausible scenario why this happened?

Aug 16 20:51:19 postgres[22329]: [2-1] FATAL: relation mapping file "global/pg_filenode.map" contains incorrect checksum

It looks like it's pretty rare and I have seen it only once at 2 different machines.

PosgreSQL version is 9.2.4.

Regards,

Tatsuki

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