Alvaro Herrera wrote:

> Hm, I think I see what's happening.  The xl_brin_update record
> references two buffers, one which is target for the updated tuple and
> another which is the revmap buffer.  When the update target buffer is
> being first used we set the INIT bit which removes the buffer reference
> from the xlog record; in that case, if the revmap buffer is first being
> modified after the prior checkpoint, that revmap buffer receives backup
> block number 0; but the code hardcodes it as 1 on the expectation that
> the buffer that's target for the update will receive 0.  The attached
> patch should fix this.

Pushed, thanks for the report.

-- 
Álvaro Herrera                http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services


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