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bug#39962: 27.0.90; Crash in Emacs 27.0.90

From: Eli Zaretskii
Subject: bug#39962: 27.0.90; Crash in Emacs 27.0.90
Date: Wed, 18 Mar 2020 16:08:00 +0200

> From: Pip Cet <address@hidden>
> Date: Wed, 18 Mar 2020 06:17:01 +0000
> Cc: Eli Zaretskii <address@hidden>, Pieter van Oostrum <address@hidden>, 
> address@hidden
> > Although I haven't been following this in detail, I'd like to suggest 
> > trying a
> > GDB watchpoint to find the bug. Watchpoints have been invaluable to me when 
> > I
> > debug garbage-collector and other memory management issues.
> They are! Unfortunately, they require a predictable address at which
> the corruption happens, and we don't appear to have that.

It would suffice to have a predictable recipe where some variable has
the right value under some conditions: then we could put a watchpoint
using that variable's value from a conditional breakpoint that only
triggers under those conditions.  Unfortunately, it sounds like even
such a predictable recipe is not available.

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