| From: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: pg15b1: FailedAssertion("val > base", File: "...src/include/utils/relptr.h", Line: 67, PID: 30485) |
| Date: | 2022-05-31 21:26:30 |
| Message-ID: | CA+hUKGKWXaUHS7MZxxTYXGZ-04QeftwK+eeaycoQ3q7=+t9PTQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Jun 1, 2022 at 9:09 AM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> > Could it use something other than its own address as the base address?
>
> Hmm, maybe we could make something of that idea ...
>
> > One way to do this would be to put it at the *end* of the
> > "Preallocated DSM" space, rather than the beginning.
>
> ... but that way doesn't sound good. Doesn't it just move the
> problem to the first object allocated inside the FPM?
Count we make the relptrs 1-based, so that 0 is reserved as a sentinel
that has the nice memset(0) property?
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