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bug#39962: 27.0.90; Crash in Emacs 27.0.90


From: Pip Cet
Subject: bug#39962: 27.0.90; Crash in Emacs 27.0.90
Date: Tue, 17 Mar 2020 04:54:31 +0000

On Tue, Mar 17, 2020 at 3:29 AM Pieter van Oostrum
<address@hidden> wrote:
> Pip Cet <address@hidden> writes:
>
> > Another thing we could try is poisoning the memory area used by a
> > vector when we put it on the free list. Something like the attached
> > patch might work.
>
> I made a new compile with the patch 
> 0001-poison-memory-of-vectors-put-on-the-free-list.patch applied and also the 
> latest 0001-Don-t-collect-reachable-killed-buffers-during-GC.patch (from 
> message ID <address@hidden>) applied.

Thanks!

> (gdb) f 3
> #3  0x000000010023cdc5 in marker_position (marker=XIL(0x12590f575))
>     at marker.c:691
> 691       register struct Lisp_Marker *m = XMARKER (marker);
> (gdb) p marker
> $1 = XIL(0x12590f575)
> (gdb) xtype
> Lisp_Vectorlike
> PVEC_NORMAL_VECTOR
> (gdb) p m
> $2 = (struct Lisp_Marker *) 0x7ffeefbe92d0

m has not been set; it would have been set to 0x12590f570; can you
print out the memory at that address? (x/32gx 0x12590f570)





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