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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 17:25:34 +0000
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> -----Original Message-----
> Of Ken Brown
> Sent: Monday, April 21, 2014 4:16 AM
> Subject: Re: Fatal error from Cygwin emacs-w32 every day or so
> 
> On 4/21/2014 1:14 AM, KARR, DAVID wrote:
> >> -----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:
> 
> Right.  I just supplied a stripped binary for a quick test.  It's not
> suitable for debugging.
> 
> > I've started it again, but not in gdb this time.
> 
> If it crashes again, I'll build a pretest of 24.4 without optimization
> and issue it as a test release.

It just failed again while sitting here in my office (no relation to VPN/network issues).

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