Re: Incomplete freezing when truncating a relation during vacuum - Mailing list pgsql-hackers

Andres Freund <andres@2ndquadrant.com> writes:
> On 2013-12-01 17:15:31 -0500, Tom Lane wrote:
>> Is there really a significant risk of clog access errors due to this bug?
>> IIUC, the risk is that tuples in pages that vacuum skips due to being
>> all-visible might not be frozen when intended.

> Unfortunately it's not actually too hard to hit due to following part of the
> code in vacuumlazy.c:

>     /*
>      * If we're not scanning the whole relation to guard against XID
>      * wraparound, it's OK to skip vacuuming a page.  The next vacuum
>      * will clean it up.
>      */

Ah.  So it's only been *seriously* broken since commit bbb6e559c, ie 9.2.
        regards, tom lane