Re: Out of Memory - 8.2.4

Alvaro Herrera <alvherre@commandprompt.com> writes:
> !         /* no need to allocate more space than we have pages */
> !         maxtuples = LAZY_ALLOC_TUPLES * relblocks;

Uh ... you need to guard against integer overflow in this calculation.
Perhaps leave the current initialization alone, and then after the
Min-reduction steps add

        /* curious coding to ensure the multiplication can't overflow */
    if ((BlockNumber) (maxtuples / LAZY_ALLOC_TUPLES) > relblocks)
        maxtuples = relblocks * LAZY_ALLOC_TUPLES;

which is demonstrably overflow-proof once maxtuples has been clamped to
less than INT_MAX.

            regards, tom lane