vacuum crash

Here is a modified version of the vacuum crash I am studying.

Interesting is that if I do a 'vacuum getting' instead of 'select * from
getting;vacuum;', I see a different error message. Rather than a crash
due to an Assert(), psql shows:

NOTICE: AbortTransaction and not in in-progress state
NOTICE: AbortTransaction and not in in-progress state

and the postmaster log file shows:

ERROR: cannot write block -1 of [] blind
AbortCurrentTransaction
NOTICE: AbortTransaction and not in in-progress state

This can be debugged by commenting out the psql command at the end,
running the script, and then running a backend from gdb and doing
'vacuum getting'.

This looks like it may be easier to track down. Vadim, any chance you
can bail me out here, again.

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