Re: BUG #15121: Multiple UBSAN errors

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Andres Freund <andres(at)anarazel(dot)de>
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 18:41:23
Message-ID: 11474.1521484883@sss.pgh.pa.us
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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.

regards, tom lane

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