bug#17526: 24.3.90; Crash in Cygwin-w32 build

[Ken Brown]

On 5/19/2014 3:39 PM, Eli Zaretskii wrote:
> > Date: Mon, 19 May 2014 15:19:24 -0400
> > From: Ken Brown <kbrown@cornell.edu>
> > CC: 17526@debbugs.gnu.org
> >
> > On 5/19/2014 11:18 AM, Eli Zaretskii wrote:
> > > > Date: Mon, 19 May 2014 08:30:49 -0400
> > > > From: Ken Brown <kbrown@cornell.edu>
> > > >
> > > > I just got a crash with the following backtrace:
> > > >
> > > > #0  0x000007fefd5f3ca3 in KERNELBASE!DebugBreak ()
> > > >      from /c/Windows/system32/KERNELBASE.dll
> > > > #1  0x000000010061a344 in emacs_abort ()
> > > >       at /usr/src/debug/emacs-24.3.90-1/src/w32fns.c:8460
> > > > #2  0x000000010043616a in move_it_to (it=0x4284e0, to_charpos=-1, to_x=-1,
> > > >       to_y=-1, to_vpos=10, op=4)
> > > >       at /usr/src/debug/emacs-24.3.90-1/src/xdisp.c:9198
> > > > #3  0x0000000100436fc2 in move_it_by_lines (it=0x4284e0, dvpos=10)
> > > >       at /usr/src/debug/emacs-24.3.90-1/src/xdisp.c:9490
> > >
> > > That's a weird crash.  Any chance of a reproducible recipe?
> >
> > No, I wasn't doing anything out of the ordinary -- just scrolling
> > through a plain text file.
>
> Well, maybe try scrolling more than usual in the future, perhaps you
> will hit it again.

I'll try.

> > There have been other weird crashes reported
> > for the Cygwin-w32 build, such as this one that was sent to the Cygwin
> > mailing list this morning:
> >
> >     https://cygwin.com/ml/cygwin/2014-05/msg00396.html
>
> That crash makes no sense, arithcompare can only abort if its 3rd
> argument is something other than the 6 enumeration values.  I suspect
> that was an optimized build (although I see no "optimized out" values
> in the backtrace).

No, it was an unoptimized build, but there's apparently something wrong 
with the backtrace.  I don't know what could cause that.

Ken