Re: BUG #15121: Multiple UBSAN errors

From: Andres Freund <andres(at)anarazel(dot)de>
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 18:27:05
Message-ID: 20180319182705.kq2vqno7arl7r2uj@alap3.anarazel.de
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-bugs

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.

Greetings,

Andres Freund

In response to

Responses

Browse pgsql-bugs by date

  From Date Subject
Next Message Tom Lane 2018-03-19 18:41:23 Re: BUG #15121: Multiple UBSAN errors
Previous Message Tom Lane 2018-03-19 18:20:33 Re: BUG #15121: Multiple UBSAN errors