GNU bug report logs - #75710
31.0.50; feature/igc: crash report on Arch Linux, 2025-01-20

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Message #23 received at 75710 <at> debbugs.gnu.org (full text, mbox):

From: Oliver Reiter <oliver.reiter <at> snapdragon.cc>
To: Pip Cet <pipcet <at> protonmail.com>
Cc: 75710 <at> debbugs.gnu.org
Subject: Re: bug#75710: 31.0.50; feature/igc: crash report on Arch Linux,
 2025-01-20
Date: Wed, 22 Jan 2025 22:32:52 +0100

[Message part 1 (text/plain, inline)]

Pip Cet <pipcet <at> protonmail.com> writes:

> "Oliver Reiter" <oliver.reiter <at> snapdragon.cc> writes:
>
>> Pip Cet <pipcet <at> protonmail.com> writes:
>>
>>> While unsatisfying, my very preliminary conclusion is that there is a
>>> significant chance that this is bug#75754.  My plan is to fix this bug
>>> unconditionally (without #ifdef HAVE_MPS) on feature/igc because I
>>> believe the bug is present, albeit much less likely, on master, and the
>>> ultimate fix for bug#75754 is likely to be both very different and take
>>> some time.
>>>
>>> Objections to this?
>>
>> If you are asking me: no objections.
>
> A preliminary workaround for bug#75754 has been installed on
> feature/igc, erring on the side of protecting too many objects rather
> than too few of them.
>
> I would ask you to please try the current branch, and to report any
> further crashes you may see as a new bug; I may be wrong about all your
> crashes being due to this bug, but maybe I'm right about one of them :-)
>
> Thanks for the reports, again!
>
> If you don't see a crash, can you let us know (without a new bug,
> ideally) in a few days, and then we can mark these as probably closed?
>
> Thanks!

Will do, and thank you!

>>>> In GNU Emacs 31.0.50 (build 4, x86_64-pc-linux-gnu, GTK+ Version
>>>>  3.24.43, cairo version 1.18.2) of 2025-01-20 built on wilap
>>>> Repository revision: 35437854166f8d0c1deceb7aba50f27cc838b490
>>>> Repository branch: feature/igc
>>>> System Description: Arch Linux
>>>>
>>>> Configured using:
>>>>  'configure 'CFLAGS=-g3 -ggdb -Og -fno-omit-frame-pointer'
>>>                                 ^^^
>>>
>>> I confess I rarely build with -Og: I'm in the -O0 team, or -Os just to
>>> see some different compiler warnings once in a while.  Thanks for
>>> testing with this flag; it might mean you see bugs others don't.
>>>
>>> In particular, stack marking with -O0 behaves in a more obvious fashion
>>> than in optimized builds; while the intention of -Og is to keep
>>> variables in the right location for debugging, I don't know how good GCC
>>> is at doing that in practice.
>>
>> Thanks for the insight, I'll build with -O0 next time.
>
> I wasn't trying to get you to do that.  Not going to stop you either, of
> course.  All options need to be tested; we just need to find the right
> balance between expanding our tests to find all possible crashes and
> gathering data on the stability and usability of IGC by running a few
> common builds and hoping they don't crash all the time.
>
> Pip

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