Checksum error and VACUUM FULL

Hello, gurus,

I faced incorrect checksum on "global/pg_filenode.map" at the right timing "VACUUM FULL" is executed and session was aborted.

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

Aug 16 20:51:19 postgres[22329]: [2-2] STATEMENT: SELECT id,readbm,writebm,survbm,timeout FROM Users WHERE username='packetlogicd' AND password=md5('xxxxx')

I'm reading the comment in src/backend/utils/cache/relmapper.c .

===
Therefore mapped catalogs can only be relocated by operations such as VACUUM FULL and CLUSTER, which make no transactionally-significant changes: it must be safe for the new file to replace the old, even if the transaction itself aborts.
===

Does this comment mean it's expected to get this kind of checksum error if the timing is really bad?

Regards,
Tatsuki