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bug#24640: Crashes in 25.1

From: Reuben Thomas
Subject: bug#24640: Crashes in 25.1
Date: Wed, 12 Oct 2016 11:57:26 +0100

On 12 October 2016 at 11:31, Eli Zaretskii <address@hidden> wrote:
> Date: Tue, 11 Oct 2016 19:33:20 +0300
> From: Eli Zaretskii <address@hidden>
> Cc: address@hidden
> > ​Yes, the crashes appear to stop when I comment out (global-undo-tree-mode) in vars.el.
> OK, so we have our prime suspect.  Can you tell where I can find the
> exact version of undo-tree-mode you are using?
> Phillip, could you please look into that package and see if you can
> spot any potential problems with the Emacs 25 undo internals?  TIA.

Some functions in undo-tree refer to or manipulate Emacs undo


Do they perhaps need some adjustments to Emacs 25's undo?

​And regardless of that, should it in principle be possible to crash Emacs (other than by exhausting memory or CPU) from Lisp, except by calling external code improperly?​

Another potential issue is the new undo timer we have in Emacs 25 (see
undo-auto--boundary-ensure-timer in simple.el).  One way of checking
whether this is related to the crashes is to modify that function to
use a much larger value for the 1st argument of run-at-time, say
10000, so that the undo timer never fires during the startup.  Reuben,
could you try that?

​Sure. I made that change in the sources and rebuilt, and it crashed "as usual".


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