Re: Emacs crashes

[Katsumi Yamaoka]

>>>>> In [emacs-w3m : No.08128] Kim F. Storm wrote:

> What does "xbacktrace" in gdb show?

(gdb) xbacktrace
"string-width"
"w3m-modeline-title"

The w3m-modeline-title function (which uses string-width) is
used as one of the mode-line-format elements like the following:

(:eval (w3m-modeline-title))

It returns the title string of the web page which is truncated
so as to be fit to the window width dynamically.

> Pls. also try the commands below:

>>
>> Program received signal SIGSEGV, Segmentation fault.
>> 0x0809704f in lisp_string_width (string=149514347, precision=-1, nchars=0x0,
>>     nbytes=0x0) at charset.c:1377
>> 1377           PARSE_MULTIBYTE_SEQ (str + i_byte, len_byte - i_byte, bytes);
>> (gdb) bt
>> #0  0x0809704f in lisp_string_width (string=149514347, precision=-1,
>>     nchars=0x0, nbytes=0x0) at charset.c:1377

> pp string

The data returned are too big to send.  What is what I should
pay attention?

>> #1  0x08097116 in Fstring_width (string=153333780) at charset.c:1415

> up 

#1  0x08097116 in Fstring_width (string=153323540) at charset.c:1415
1415      XSETFASTINT (val, lisp_string_width (string, -1, NULL, NULL));

> pp string

[138568309 (
Program received signal SIGSEGV, Segmentation fault.
0x0815fcbe in print_object (obj=706748453, printcharfun=137486193, 
    escapeflag=1) at print.c:1784
1784                    print_object (XCAR (obj), printcharfun, escapeflag);
The program being debugged was signaled while in a function called from GDB.
GDB remains in the frame where the signal was received.
To change this behavior use "set unwindonsignal on"
Evaluation of the expression containing the function (debug_print) will be 
abandoned.

>> #2  0x0814cfaf in Ffuncall (nargs=2, args=0x6f3b97) at eval.c:2790
>> #3  0x081763c0 in Fbyte_code (bytestr=146859528, vector=1,
>>     maxdepth=-1073752640) at bytecode.c:686
>> #4  0x0814d3a3 in funcall_lambda (fun=146877780, nargs=0,
>>     arg_vector=0xbfffd67c) at eval.c:2979
>> #5  0x0814d228 in apply_lambda (fun=0, args=1, eval_flag=1) at eval.c:2901
>> #6  0x0814c275 in Feval (form=1) at eval.c:2191
>> #7  0x0814b354 in internal_condition_case_1 (bfun=0x814c0c0 <Feval>,
>>     arg=146202181, handlers=137397969, hfun=0x8062910 <safe_eval_handler>)
>>     at eval.c:1430
>> #8  0x080629aa in safe_eval (sexpr=0) at xdisp.c:1979
>> #9  0x08078a45 in display_mode_element (it=0xbfffda80, depth=5,
>>     field_width=-13, precision=-24, elt=0, props=137397921, risky=0)
>>     at xdisp.c:16052

> up 8

#8  0x081763c0 in Fbyte_code (bytestr=146900216, vector=1, 
    maxdepth=-1073755488) at bytecode.c:686
686                 TOP = Ffuncall (op + 1, &TOP);

> p elt

No symbol "elt" in current context.

> (is elt really 0 here?  If not, try:
>  pp elt
> )

No symbol "elt" in current context.

>> #10 0x0807891c in display_mode_element (it=0xbfffda80, depth=3, 
>> field_width=0,
>>     precision=-11, elt=145091869, props=137397921, risky=0) at xdisp.c:16133

> up 

#9  0x0814d3a3 in funcall_lambda (fun=146918468, nargs=0, 
    arg_vector=0xbfffcb5c) at eval.c:2979
2979          val = Fbyte_code (AREF (fun, COMPILED_BYTECODE),

> pp elt

No symbol "elt" in current context.

[...]

Regards,