bug#10060: 24.0.91; Built-in GNUtls err=-64 error

[nyc4bos]

When using an intentionally incorrect PEM file, Emacs gives the following
*Backtrace* (see below).

The *Message* buffer has:

Starting GNUTLS
gnutls.el: (err=[-64] Error while reading file.) boot: (:priority NORMAL 
:hostname imap.aim.com :loglevel 0 :min-prime-bits nil :trustfiles (AOL.pem) 
:crlfiles nil :keylist nil :verify-flags nil :verify-error nil 
:verify-hostname-error t :callbacks nil)
Entering debugger...

Can the built-in GNUtls give a more graceful error message, if possible,
for a "err=[-64] error?

Thanks.

Diagnostic information follows:

Debugger entered--Lisp error: (gnutls-error #<process tls> -64)
  signal(gnutls-error (#<process tls> -64))
  (progn (signal (quote gnutls-error) (list process ret)))
  (if (gnutls-errorp ret) (progn (signal (quote gnutls-error) (list process 
ret))))
  (when (gnutls-errorp ret) (signal (quote gnutls-error) (list process ret)))
  (let* ((type (or type (quote gnutls-x509pki))) (default-trustfile "AOL.pem") 
(trustfiles (or trustfiles (when (file-exists-p default-trustfile) (list 
default-trustfile)))) (priority-string (or priority-string (cond ((eq type 
(quote gnutls-anon)) "NORMAL:+ANON-DH:!ARCFOUR-128") ((eq type (quote 
gnutls-x509pki)) (if gnutls-algorithm-priority (upcase 
gnutls-algorithm-priority) "NORMAL"))))) (min-prime-bits (or min-prime-bits 
gnutls-min-prime-bits)) (params (\` (:priority (\, priority-string) :hostname 
(\, hostname) :loglevel (\, gnutls-log-level) :min-prime-bits (\, 
min-prime-bits) :trustfiles (\, trustfiles) :crlfiles (\, crlfiles) :keylist 
(\, keylist) :verify-flags (\, verify-flags) :verify-error (\, verify-error) 
:verify-hostname-error (\, verify-hostname-error) :callbacks nil))) ret) 
(gnutls-message-maybe (setq ret (gnutls-boot process type params)) "boot: %s" 
params) (when (gnutls-errorp ret) (signal (quote gnutls-error) (list process 
ret))) process)
  (catch (quote --cl-block-gnutls-negotiate--) (message "Starting GNUTLS") 
(let* ((type (or type (quote gnutls-x509pki))) (default-trustfile "AOL.pem") 
(trustfiles (or trustfiles (when (file-exists-p default-trustfile) (list 
default-trustfile)))) (priority-string (or priority-string (cond ((eq type ...) 
"NORMAL:+ANON-DH:!ARCFOUR-128") ((eq type ...) (if gnutls-algorithm-priority 
... "NORMAL"))))) (min-prime-bits (or min-prime-bits gnutls-min-prime-bits)) 
(params (\` (:priority (\, priority-string) :hostname (\, hostname) :loglevel 
(\, gnutls-log-level) :min-prime-bits (\, min-prime-bits) :trustfiles (\, 
trustfiles) :crlfiles (\, crlfiles) :keylist (\, keylist) :verify-flags (\, 
verify-flags) :verify-error (\, verify-error) :verify-hostname-error (\, 
verify-hostname-error) :callbacks nil))) ret) (gnutls-message-maybe (setq ret 
(gnutls-boot process type params)) "boot: %s" params) (when (gnutls-errorp ret) 
(signal (quote gnutls-error) (list process ret))) process) (message "DEBUG: %s 
" trustfiles))
  (cl-block-wrapper (catch (quote --cl-block-gnutls-negotiate--) (message 
"Starting GNUTLS") (let* ((type (or type (quote gnutls-x509pki))) 
(default-trustfile "AOL.pem") (trustfiles (or trustfiles (when (file-exists-p 
default-trustfile) (list default-trustfile)))) (priority-string (or 
priority-string (cond (... "NORMAL:+ANON-DH:!ARCFOUR-128") (... ...)))) 
(min-prime-bits (or min-prime-bits gnutls-min-prime-bits)) (params (\` 
(:priority (\, priority-string) :hostname (\, hostname) :loglevel (\, 
gnutls-log-level) :min-prime-bits (\, min-prime-bits) :trustfiles (\, 
trustfiles) :crlfiles (\, crlfiles) :keylist (\, keylist) :verify-flags (\, 
verify-flags) :verify-error (\, verify-error) :verify-hostname-error (\, 
verify-hostname-error) :callbacks nil))) ret) (gnutls-message-maybe (setq ret 
(gnutls-boot process type params)) "boot: %s" params) (when (gnutls-errorp ret) 
(signal (quote gnutls-error) (list process ret))) process) (message "DEBUG: %s 
" trustfiles)))
  (block gnutls-negotiate (message "Starting GNUTLS") (let* ((type (or type 
(quote gnutls-x509pki))) (default-trustfile "AOL.pem") (trustfiles (or 
trustfiles (when (file-exists-p default-trustfile) (list default-trustfile)))) 
(priority-string (or priority-string (cond ((eq type ...) 
"NORMAL:+ANON-DH:!ARCFOUR-128") ((eq type ...) (if gnutls-algorithm-priority 
... "NORMAL"))))) (min-prime-bits (or min-prime-bits gnutls-min-prime-bits)) 
(params (\` (:priority (\, priority-string) :hostname (\, hostname) :loglevel 
(\, gnutls-log-level) :min-prime-bits (\, min-prime-bits) :trustfiles (\, 
trustfiles) :crlfiles (\, crlfiles) :keylist (\, keylist) :verify-flags (\, 
verify-flags) :verify-error (\, verify-error) :verify-hostname-error (\, 
verify-hostname-error) :callbacks nil))) ret) (gnutls-message-maybe (setq ret 
(gnutls-boot process type params)) "boot: %s" params) (when (gnutls-errorp ret) 
(signal (quote gnutls-error) (list process ret))) process) (message "DEBUG: %s 
" trustfiles))
  (let* ((process (car (cdr (memq (quote :process) spec)))) (type (car (cdr 
(memq (quote :type) spec)))) (hostname (car (cdr (memq (quote :hostname) 
spec)))) (priority-string (car (cdr (memq (quote :priority-string) spec)))) 
(trustfiles (car (cdr (memq (quote :trustfiles) spec)))) (crlfiles (car (cdr 
(memq (quote :crlfiles) spec)))) (keylist (car (cdr (memq (quote :keylist) 
spec)))) (min-prime-bits (car (cdr (memq (quote :min-prime-bits) spec)))) 
(verify-flags (car (cdr (memq (quote :verify-flags) spec)))) (verify-error (car 
(cdr (memq (quote :verify-error) spec)))) (verify-hostname-error (car (cdr 
(memq (quote :verify-hostname-error) spec))))) (block gnutls-negotiate (message 
"Starting GNUTLS") (let* ((type (or type (quote gnutls-x509pki))) 
(default-trustfile "AOL.pem") (trustfiles (or trustfiles (when (file-exists-p 
default-trustfile) (list default-trustfile)))) (priority-string (or 
priority-string (cond (... "NORMAL:+ANON-DH:!ARCFOUR-128") (... ...)))) 
(min-prime-bits (or min-prime-bits gnutls-min-prime-bits)) (params (\` 
(:priority (\, priority-string) :hostname (\, hostname) :loglevel (\, 
gnutls-log-level) :min-prime-bits (\, min-prime-bits) :trustfiles (\, 
trustfiles) :crlfiles (\, crlfiles) :keylist (\, keylist) :verify-flags (\, 
verify-flags) :verify-error (\, verify-error) :verify-hostname-error (\, 
verify-hostname-error) :callbacks nil))) ret) (gnutls-message-maybe (setq ret 
(gnutls-boot process type params)) "boot: %s" params) (when (gnutls-errorp ret) 
(signal (quote gnutls-error) (list process ret))) process) ))
  gnutls-negotiate(:process #<process tls> :type gnutls-x509pki 
:verify-hostname-error t :hostname "imap.aim.com")
  eval((gnutls-negotiate :process (open-network-stream "tls" "tls-buffer" 
"imap.aim.com" 993) :type (quote gnutls-x509pki) :verify-hostname-error 
verify-hostname-error :hostname host-X) nil)
  eval-last-sexp-1(t)
  eval-last-sexp(t)
  eval-print-last-sexp()
  call-interactively(eval-print-last-sexp nil nil)



In GNU Emacs 24.0.91.1 (i386-mingw-nt5.1.2600)
 of 2011-11-14 on MARVIN
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.6) --no-opt --cflags 
-I"D:/devel/emacs/libs/libXpm-3.5.8/include" 
-I"D:/devel/emacs/libs/libXpm-3.5.8/src" 
-I"D:/devel/emacs/libs/libpng-dev_1.4.3-1/include" 
-I"D:/devel/emacs/libs/zlib-dev_1.2.5-2/include" 
-I"D:/devel/emacs/libs/giflib-4.1.4-1/include" 
-I"D:/devel/emacs/libs/jpeg-6b-4/include" 
-I"D:/devel/emacs/libs/tiff-3.8.2-1/include" 
-I"D:/devel/emacs/libs/gnutls-2.10.1/include" --ldflags 
-L"D:/devel/emacs/libs/gnutls-2.10.1/lib"'

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US
  value of $XMODIFIERS: nil
  locale-coding-system: cp949
  default enable-multibyte-characters: t

Major mode: Message

Minor modes in effect:
  gnus-message-citation-mode: t
  jabber-activity-mode: t
  mml-mode: t
  show-paren-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t
  abbrev-mode: t

Recent input:
<return> n <return> C-n SPC SPC <help-echo> n C-p C-f 
C-f C-f C-f SPC <help-echo> <help-echo> <help-echo> 
SPC C-n C-f C-f C-f SPC SPC <backspace> F C-x k <return> 
y e s <return> C-x o C-x b * s c <tab> <return> C-x 
i s x 3 <tab> <return> C-s c h o o C-a C-n C-n C-n 
C-n C-n C-n C-f C-f C-f C-f C-f C-f C-f C-f C-SPC C-f 
C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f 
C-f C-f C-f C-f C-f <escape> w C-a C-n C-n C-n C-e 
SPC C-y C-a C-SPC C-n C-w C-y <escape> < C-n C-n C-n 
C-n C-y <return> C-p C-p C-e C-j C-x b <return> C-x 
o F C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <menu-bar> <help-menu> 
<send-emacs-bug-report>

Recent messages:
Mark set
Mark saved where search started
Mark set [8 times]
xding
goto-history-element: End of history; no default available
xding
goto-history-element: End of history; no default available

Load-path shadows:
None found.

Features:
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parse-time netrc gnutls network-stream gnus-agent gnus-srvr gnus-score
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smime dig nntp gnus-cache offlineimap google-weather url-cache
google-maps google-maps-static google-maps-geocode google-maps-base json
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xml jabber-menu jabber-autoloads jabber-util epa-file epa epg epg-config
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multi-tty emacs)