Re: Segmentation violation in display_string

[Kim F. Storm]

Milan Zamazal <address@hidden> writes:

> CVS Emacs dated 2005-05-23 often crashes with segmentation violation.
> I'm sorry, I don't know a way how to reproduce the bug and it happens on
> a computer of another user.  But I have remote access to gdb on that
> computer, so I can provide information about Emacs state after the
> crash.

Milan sent me the following additional information [slightly edited]:

> xbacktrace

"format-mode-line"
"speechd-speak--get-buffer-identification"
0x8912324 PVEC_COMPILED
"mapcar"
"speechd-speak--current-info"
"speechd-speak--post-read-info-change"
"byte-code"
"byte-code"
"speechd-speak--post-command-hook"
"run-hooks"

The speechd-speak--get-buffer-identification function does the
following:

      (when (fboundp 'format-mode-line)
        (let ((ident (format-mode-line mode-line-buffer-identification)))
          (set-text-properties 0 (length ident) nil ident)
          ident))

    >> #0  0x0807a01b in display_string (string=0x0, lisp_string=0, 
face_string=137388049, face_string_pos=0, start=0, it=0xbfffde30,
    >> field_width=0, precision=0, max_x=127, multibyte=0) at xdisp.c:17092
    >> #1  0x0807889b in display_mode_element (it=0xbfffde30, depth=4, 
field_width=-14, precision=-14, elt=148322947,
    >> props=137388049, risky=0) at xdisp.c:15811
    >> #2  0x08078542 in display_mode_element (it=0xbfffde30, depth=3, 
field_width=-14, precision=-14, elt=146806181,
    >> props=137388049, risky=0) at xdisp.c:15970
    >> #3  0x0807844c in display_mode_element (it=0xbfffde30, depth=1, 
field_width=0,precision=0, elt=148007253, props=137388049,
    >> risky=0) at xdisp.c:16036
    >> #4  0x08079063 in Fformat_mode_line (format=148007277, face=0, 
window=-1073750480, buffer=147410876) at xdisp.c:16252

    KFS> What is the value of format here?  Try

    KFS> pp format

("%b " (w3m-current-process w3m-modeline-process-status-on (w3m-current-ssl 
(w3m-display-inline-images w3m-modeline-ssl-image-status-on 
w3m-modeline-ssl-status-off) (w3m-display-inline-images 
w3m-modeline-image-status-on w3m-modeline-status-off))) 
(w3m-show-graphic-icons-in-mode-line (w3m-use-favicon (w3m-favicon-image 
w3m-modeline-favicon w3m-modeline-separator) w3m-modeline-separator) 
w3m-modeline-separator) (w3m-current-process "Loading..." (:eval 
(w3m-modeline-title))))