GNU bug report logs - #76559
31.0.50; [-O3 + PGTK] Crash when 'copying as kill'/'killing word'

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From: Po Lu <luangruo <at> yahoo.com>
To: Pip Cet <pipcet <at> protonmail.com>
Cc: Michael Albinus <michael.albinus <at> gmx.de>, Iurie Marian <marian.iurie <at> gmail.com>, 76559 <at> debbugs.gnu.org
Subject: bug#76559: 31.0.50; [-O3 + PGTK] Crash when 'copying as kill'/'killing word'
Date: Sat, 01 Mar 2025 11:20:19 +0800

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

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

> My understanding is it is safe to access an entire union at once, as the
> old code did, and that GCC concluded based on the undefined behavior
> elsewhere that the only possible union members were those with the holes
> in the right place.

BTW, if so, how do you explain this reproducer?  At no point in the
code's execution is hold_quit ever read or written to.

[reduction.h (text/plain, attachment)]

[reduction1.c (text/plain, attachment)]

[reduction.c (text/plain, attachment)]

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