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From: "KARR, DAVID" <dk068x AT att DOT com>
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: RE: Fatal error from Cygwin emacs-w32 every day or so
Date: Mon, 21 Apr 2014 05:14:11 +0000
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> -----Original Message-----
> Of KARR, DAVID
> Sent: Saturday, April 19, 2014 6:19 PM
> Subject: RE: Fatal error from Cygwin emacs-w32 every day or so
> 
> > -----Original Message-----
> > Of Ken Brown
> > Sent: Saturday, April 19, 2014 4:38 PM
> > Subject: Re: Fatal error from Cygwin emacs-w32 every day or so
> >
> > On 4/15/2014 12:13 PM, Ken Brown wrote:
> > > On 4/15/2014 12:12 AM, Eli Zaretskii wrote:
> > >>> Date: Mon, 14 Apr 2014 21:08:15 -0700
> > >>> From: Ken Brown
> > >>>
> > >>>> I just saw it die, and this is the bt I get:
> > >>>>
> > >>>> Program received signal SIGSEGV, Segmentation fault.
> > >>>> 0x0000000100551354 in wait_reading_process_output (
> > >>>>       time_limit=time_limit AT entry=0, nsecs=nsecs AT entry=0,
> > >>>>       read_kbd=read_kbd AT entry=-1, do_display=do_display AT entry=true,
> > >>>>       wait_for_cell=wait_for_cell AT entry=4304630834,
> > >>>>       wait_proc=wait_proc AT entry=0x0,
> > >>>> just_wait_proc=just_wait_proc AT entry=0)
> > >>>>      @/usr/src/debug/emacs-24.3-7/src/process.c:4677
> > >>>> 4677                      if (wait_proc->gnutls_p /* Check for
> valid
> > >>>> process.  */
> > >>>
> > >>> This backtrace doesn't make sense.  If you look at the source code,
> > >>> you'll see that if wait_proc is NULL on entry to
> > >>> wait_reading_process_output, then line 4677 is never reached.  I'm
> not
> > >>> sure what would cause a bogus backtrace like this.  BLODA?
> > >>> Optimization?
> > >>>
> > >>> In any case, I suggest that you wait a week until I have a chance to
> > >>> build a pretest of 24.4 for you to try.  I'll build it without
> > >>> optimization to make debugging easier.
> > >>
> > >> This is a known problem with GnuTLS support, it was solved in the
> > >> Emacs repository last November (bzr revision 114956, if someone wants
> > >> the diffs), and surely should be solved in the upcoming Emacs 24.4.
> > >
> > > Thanks, Eli!  In that case I'll make a new release of emacs-24.3 with
> > > that patch applied, to see if it resolves the issue for the OP.
> >
> > I've rebuilt emacs-24.3 with the gnutls fix.  David and Achim (and
> > anyone else who's been experiencing these crashes), please try the
> > following binary and let me know if it solves the problem:
> >
> >     http://sanibeltranquility.com/cygwin/emacs-w32.exe.xz
> >
> > You might have to do "chmod +x emacs-w32.exe" after uncompressing it.
> >
> > If it fixes the problem, I'll issue a new release of emacs-24.3.  If
> > not, I'll build a pretest of emacs-24.4 for you to try.
> 
> Ok.  It's running.  As it only fails after random intervals, I'll have to
> keep it running for a while.  I'll give it a day or so.

I came back to my computer and saw two dialogs, one saying that my VPN connection had died (that happens from time to time), and the other the Emacs failure dialog.  I started this executable from gdb, but it's saying that it doesn't have symbols, so the stacktrace probably isn't helpful, but this is what I saw:
--------------------
Program received signal SIGTRAP, Trace/breakpoint trap.
0x000007fefd773ca3 in KERNELBASE!DebugBreak ()
   from /c/Windows/system32/KERNELBASE.dll
(gdb)
(gdb) bt
#0  0x000007fefd773ca3 in KERNELBASE!DebugBreak ()
   from /c/Windows/system32/KERNELBASE.dll
#1  0x000000010056e6cb in ?? ()
#2  0x0000000000429318 in ?? ()
#3  0x000000010091ccd8 in ?? ()
#4  0x0000000000000000 in ?? ()
(gdb)
--------------------

I've started it again, but not in gdb this time.

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