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


From: Ken Brown
Subject: bug#17526: 24.3.90; Crash in Cygwin-w32 build
Date: Mon, 19 May 2014 15:19:24 -0400
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0

On 5/19/2014 11:18 AM, Eli Zaretskii wrote:
Date: Mon, 19 May 2014 08:30:49 -0400
From: Ken Brown <address@hidden>

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. 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

This is stock Emacs 24.3.90, with no C-level changes, right?

Yes.

I still have the gdb session open if further information would be useful.

Yes, please.  I'd like to see the values of these, in frame #2:

   skip
   it->current
   it->current_x
   it->current_y
   it->vpos

Also, what text is there in the window where the scroll command was
attempted, starting from the text position in it->current.pos.charpos
and for 10 screen lines down?

Unfortunately, my computer spontaneously rebooted while installing some software, without giving me a chance to say "reboot later". So I have no information, and there's probably no more we can do with this bug.

Ken





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