[gnutls-devel] Incompatibility between Emacs/gnutls and Emacs/cygwin-mount

[Eli Zaretskii]

> From: "Jeffrey J. Kosowsky" <jeff at kosowsky.org>
> Date: Tue, 22 Oct 2013 16:55:59 -0400
> 
> I am running Emacs 24.3.1 under Windows 7 on an Intel core 5 machine.
> I loaded in the latest gnutls-3.2.4-win32 binaries fron gnutls.org.
> 
> I then ran:
> (open-gnutls-stream "tls" "tls-buffer" "imap.gmail.com" "imaps")
> 
> which leads to a sudden, *fatal* emacs crash. Emacs gives me the
> following error in the message line before immediately crashing the
> entire emacs process: GnuTLS error: #<proces IMAP over SSL>, -64
> 
> The Windows crash both then gives me the following error:
> Problem signature:
>   Problem Event Name:	APPCRASH
>   Application Name:		emacs.exe
>   Application Version:	24.2.50.0
>   Application Timestamp:		5037d090
>   Fault Module Name:			libgnutls-28.dll
>   Fault Module Version:			0.0.0.0
>   Fault Module Timestamp:		501d8392
>   Exception Code:				c0000005
>   Exception Offset:				0000657e
>   OS Version:					6.1.7601.2.1.0.768.3
>   Locale ID:					1033
>   Additional Information 1:		0a9e
>   Additional Information 2:		0a9e372d3b4ad19135b953a78882e789
>   Additional Information 3:		0a9e
>   Additional Information 4:		0a9e372d3b4ad19135b953a78882e789
> 
> I found that the crash is caused by an incompatibility with the
> cygwin-mount library and in particular by a call to the cygwin program
> mount.exe. Indeed, settting /bin/mount.exe to /bin/true.exe eliminates
> the crash.
> 
> I presume that the issue is due to an incompatibility (probably with
> cygwin.dll).

Where exactly do mount.exe and cygwin-mount come into play here?

> Any thoughts on how to debug and fix?

Run Emacs under GDB, and provide the backtrace from the crash, that
should give some clues regarding the reasons.  The information you
show above (from the Windows Event Viewer, it seems) is insufficient
for that purpose.