Re: Emacs crashes, 07nov16

["Jan Djärv" <jan.h.d@swipnet.se>]

Looks loke you printed *s->font twice, but not *s->font_info.  It could be an 
effect of optimization, can you try again wih -O0?

Thanks,

	Jan D.


Robert J. Chassell skrev:
> jan.h.d@swipnet.se writes
> 
>     Hmm, it looks like someone is overwriting the stack.  77 is
>     X_ImageText16 (XDrawImageString16) so some parameter to that call
>     is bad.  But where that corruption happens is har to know.
> 
> Interesting!  I get this 
> 
>     (gdb) l x_draw_glyph_string_foreground
>     Function "x_draw_glyph_string_foreground" not defined.
> 
> both when my breakpoint is abort () at emacs.c:431 and when it is
> x_connection_closed at xterm.c:7786 
> even though
> x_draw_glyph_string_foreground (s) is defined on line 1316 of xterm.c
> and line 1374 of xterm.c is
> 
> 	    XDrawImageString16 (s->display, s->window, s->gc, x,
> 
> When I run and try to display the euro character having previously:
> 
>     (gdb) b 1374
>          <i.e. the line that XDrawImageString16 is on.  Not to be confused with
>           XDrawString16 that occurs a bit before this line>
> 
> I see this:
> 
>     (gdb) r
>     The program being debugged has been started already.
>     Start it from the beginning? (y or n) y
>     Starting program: /usr/local/src/emacs/src/emacs -i -q     --eval '(emacs-version t)' -bg DodgerBlue4 -fg white     -fn '-Misc-Fixed-Medium-R-Normal--20-200-75-75-C-100-ISO8859-1'     -geometry 80x44+545+51 -name '-q GNU Emacs in Debugger 4'
>     [Thread debugging using libthread_db enabled]
>     [New Thread 0xb71fc920 (LWP 10230)]
>     [Switching to Thread 0xb71fc920 (LWP 10230)]
> 
>     Breakpoint 4, x_draw_glyph_string (s=0xbfe761b0) at xterm.c:1374
> 
>     (gdb)  p *s
>     $1 = {
>       x = 30, 
>       y = 180, 
>       ybase = 196, 
>       width = 10, 
>       background_width = 10, 
>       height = 20, 
>       left_overhang = 0, 
>       right_overhang = 0, 
>       f = 0x8601840, 
>       w = 0x86019c8, 
>       display = 0x85b8f00, 
>       window = 46137561, 
>       row = 0x86278cc, 
>       area = TEXT_AREA, 
>       char2b = 0xbfe76190, 
>       nchars = 1, 
>       hl = DRAW_NORMAL_TEXT, 
>       face = 0x8798b40, 
>       font = 0x8859550, 
>       font_info = 0x8603318, 
>       cmp = 0x0, 
>       gidx = 0, 
>       extends_to_end_of_line_p = 0, 
>       background_filled_p = 0, 
>       two_byte_p = 1, 
>       font_not_found_p = 0, 
>       stippled_p = 0, 
>       for_overlaps = 0, 
>       gc = 0x858e5f8, 
>       first_glyph = 0x86064b8, 
>       img = 0x0, 
>       slice = {
>         x = 0, 
>         y = 0, 
>         width = 0, 
>         height = 0
>       }, 
>       clip_head = 0x0, 
>       clip_tail = 0x0, 
>       next = 0xbfe76100, 
>       prev = 0x0
>     }
>     (gdb)  p *s->font
>     $2 = {
>       ext_data = 0x8798be8, 
>       fid = 46138179, 
>       direction = 0, 
>       min_char_or_byte2 = 0, 
>       max_char_or_byte2 = 255, 
>       min_byte1 = 0, 
>       max_byte1 = 255, 
>       all_chars_exist = 0, 
>       default_char = 0, 
>       n_properties = 23, 
>       properties = 0x8847370, 
>       min_bounds = {
>         lbearing = 0, 
>         rbearing = 0, 
>         width = 10, 
>         ascent = -3, 
>         descent = -15, 
>         attributes = 0
>       }, 
>       max_bounds = {
>         lbearing = 9, 
>         rbearing = 10, 
>         width = 10, 
>         ascent = 16, 
>         descent = 4, 
>         attributes = 0
>       }, 
>       per_char = 0xb6d75000, 
>       ascent = 16, 
>       descent = 4
>     }
>     (gdb) p *s->font_info
>     $3 = {
>       ext_data = 0x8798be8, 
>       fid = 46138179, 
>       direction = 0, 
>       min_char_or_byte2 = 0, 
>       max_char_or_byte2 = 255, 
>       min_byte1 = 0, 
>       max_byte1 = 255, 
>       all_chars_exist = 0, 
>       default_char = 0, 
>       n_properties = 23, 
>       properties = 0x8847370, 
>       min_bounds = {
>         lbearing = 0, 
>         rbearing = 0, 
>         width = 10, 
>         ascent = -3, 
>         descent = -15, 
>         attributes = 0
>       }, 
>       max_bounds = {
>         lbearing = 9, 
>         rbearing = 10, 
>         width = 10, 
>         ascent = 16, 
>         descent = 4, 
>         attributes = 0
>       }, 
>       per_char = 0xb6d75000, 
>       ascent = 16, 
>       descent = 4
>     }
>     (gdb)  p x
>     ^done,locals=[{name="tem",type="long unsigned int",value="<value optimized out>"},{name="h",type="long unsigned int",value="<value optimized out>"},{name="y",type="int",value="<value optimized out>"},{name="relief_drawn_p",type="int",value="0"}]
>     (gdb)  p boff
>     ^done,locals=[{name="tem",type="long unsigned int",value="<value optimized out>"},{name="h",type="long unsigned int",value="<value optimized out>"},{name="y",type="int",value="<value optimized out>"},{name="relief_drawn_p",type="int",value="0"}]
>     (gdb) 
> 
> 
> 
> Starting with fixed 20 and going to a Courier font of 18 (there are
> none readily available for 20) using S-down-mouse-1 (mouse-set-font),
> I can display the Euro sign as I can with fixed 18.
> 
> When I do S-down-mouse-1 (mouse-set-font) with fixed 18 (i.e., with
> -Misc-Fixed-Medium-R-Normal--18-120-100-100-C-90-ISO8859-1), I do not
> see fontset startup: 20-dot medium which is visible when I start with
> fixed 20 (i.e., with
> -Misc-Fixed-Medium-R-Normal--20-200-75-75-C-100-ISO8859-1).
> 
> Incidentally, Courier fonts 14 and 18 are bigger than fixed 20 and
> Courier font 12 is smaller.
> 
> 
> 
> 
> Today's GNU Emacs CVS snapshot, Wed, 2007 Nov 21  10:49 UTC
> GNU Emacs 23.0.50.9 (i686-pc-linux-gnu, GTK+ Version 2.12.1)
> started in debugger with
> 
>     set args -i -q \
>     --eval '(emacs-version t)' -bg DodgerBlue4 -fg white \
>     -fn '-Misc-Fixed-Medium-R-Normal--20-200-75-75-C-100-ISO8859-1' \
>     -geometry 80x44+545+51 -name '-q GNU Emacs in Debugger 4'
> 
> architecture: i686
> Linux kernel: 2.6.22-2-686
> distribution: Debian testing, updated today
> 
>