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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 15:53:59 -0400
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0

On 5/19/2014 3:39 PM, Eli Zaretskii wrote:
Date: Mon, 19 May 2014 15:19:24 -0400
From: Ken Brown <address@hidden>
CC: address@hidden

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.

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





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