From: | Andres Freund <andres(at)anarazel(dot)de> |
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To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Martin Liška <marxin(dot)liska(at)gmail(dot)com>, pgsql-bugs(at)lists(dot)postgresql(dot)org |
Subject: | Re: BUG #15121: Multiple UBSAN errors |
Date: | 2018-03-19 19:18:53 |
Message-ID: | 20180319191853.fih4ods7vwi7552q@alap3.anarazel.de |
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Lists: | pgsql-bugs |
On 2018-03-19 14:41:23 -0400, Tom Lane wrote:
> Andres Freund <andres(at)anarazel(dot)de> writes:
> > On 2018-03-19 14:20:33 -0400, Tom Lane wrote:
> >> I tried -O3 with gcc 7.3.1 (Fedora 26), and that passes check-world
> >> just fine. Then I tried -O3 with gcc 8.0.1 (prerelease Fedora 28),
> >> and indeed that's got some problems.
>
> >> Note that 1-D and 2-D arrays print fine, it's only 3-D or deeper
> >> that print wrong. Very odd. Maybe it's bad code on our part,
> >> but I think the odds are at least as good that it's a new gcc bug.
>
> > Might be worth trying with a new clang, I think it's been a bit ahead on
> > the quality of the ubsan (et al) integration quality.
>
> I'm not talking about ubsan, I'm just talking about whether our regression
> tests pass with the higher -O level.
Oh. I think I'll setup two BF animals that continually run using
debian's gcc-snapshot package, once with O0 and once with O3.
Greetings,
Andres Freund
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