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Date:	Mon, 1 Mar 2021 17:41:57 +0900
To:	cygwin AT cygwin DOT com
Subject:	Re: segfault on 32bit cygwin snapshot
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From:	Takashi Yano via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
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On Mon, 1 Mar 2021 09:55:46 +0900
Takashi Yano wrote:
> On Sun, 28 Feb 2021 19:48:28 +0100
> Marco Atzeri wrote:
> > On 20.02.2021 23:29, Takashi Yano wrote:
> > > On Sat, 20 Feb 2021 22:01:38 +0100
> > > Marco Atzeri wrote:
> > >> MC using latest snapshot 32bit 2021-02-19 (and 2021-02-10)
> > >>
> > >> now fails at startup with
> > >>
> > >> Exception: STATUS_ACCESS_VIOLATION at eip=61083736
> > > 
> > > Thanks for the report. I found the cause of this issue.
> > > I will submit a patch to fix it.
> > > 
> > 
> > mc is now fine with 2021-02-22
> > 
> > but I found another issue
> > 
> >   $ /usr/bin/lilypond
> > GNU LilyPond 2.20.0
> > Segmentation fault (core dumped)
> > 
> > on 3.1.7 it works fine
> 
> I found this problem causes after the commit:
> 
> commit 532b91d24e9496c7988b2b1dda7fc0e8b161f782
> Author: Corinna Vinschen <corinna AT vinschen DOT de>
> Date:   Mon Dec 14 12:29:23 2020 +0100
> 
>     Cygwin: Make sure newer apps get uname_x even when loading uname dynamically
> 
>     if an application built after API version 334 loads uname dynamically,
>     it actually gets the old uname, rather than the new uname_x.  Fix this by
>     checking the apps API version in uname and call uname_x instead, if it's
>     a newer app.
> 
>     Signed-off-by: Corinna Vinschen <corinna AT vinschen DOT de>
> 
> Reverting this commit solves the issue.
> 
> Corinna, could you please have a look?

I looked into this deeper a bit.

Perhaps, lilypond passes old small sized utsname structure to
uname() via old cygguile-17.dll (built on Apr. 2017). This seems
to cause stack destruction.

-- 
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
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