Re: Spurious "apparent wraparound" via SimpleLruTruncate() rounding - Mailing list pgsql-hackers

On Wed, Feb 13, 2019 at 11:26:23PM -0800, Noah Misch wrote:
> On further study, I was able to reproduce data loss

> Fixes are available:
> 
> a. Fix the rounding in SimpleLruTruncate().  (The patch I posted upthread is
>    wrong; I will correct it in a separate message.)

Here's a corrected version.  I now delete a segment only if both its first
page and its last page are considered to precede the cutoff; see the new
comment at SlruMayDeleteSegment().