Tom Lane wrote:

> So: I put the blame on the fact that summarize_range() thinks that
> the tuple offset it has for the placeholder tuple is guaranteed to
> hold good, even across possibly-long intervals where it's holding
> no lock on the containing buffer.

Yeah, I think this is a pretty reasonable explanation for the problem.
I don't understand why it doesn't fail in 9.6.

> Fixing this without creating new problems is beyond my familiarity
> with the BRIN code.  It looks like it might be nontrivial :-(


Álvaro Herrera      
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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