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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.diffs,gmane.emacs.devel
Subject: Re: master e163745: Fix retrieval of frame delay when using GDI+
Date: Fri, 17 Apr 2020 09:56:57 +0300
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To: Juanma Barranquero <lekktu@gmail.com>
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 (message from Juanma Barranquero on Fri, 17 Apr 2020 01:53:37 +0200)
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> From: Juanma Barranquero <lekktu@gmail.com>
> Date: Fri, 17 Apr 2020 01:53:37 +0200
> Cc: emacs-diffs@gnu.org
> 
> Thread 1 hit Breakpoint 2, decode_delay (
>     propertyItem=propertyItem@entry=0x56b2f90, frame=frame@entry=0)
>     at w32image.c:219
> 219     {
> (gdb) n
> 220       enum PropertyItem_type type = propertyItem[0].type;
> (gdb) n
> 223       switch (type)
> (gdb) n
> [New Thread 3872.0x3094]
> 237           emacs_abort ();
> (gdb) p type
> $1 = 43947
> (gdb) 

Is that the same multi-frame TIFF files you reported a crash a minute
ago?  Or is this a different use case?