Re: Crash with mtr and latest ncurses

[Thomas Dickey]

On Mon, Apr 10, 2017 at 12:46:37PM +0200, Dr. Werner Fink wrote:
> Hi,
> 
> the crash does happen in _nc_init_acs_sp() of ncurses/tinfo/lib_acs.c
> 
>  gdb --args ./mtr 127.0.0.1
>  [...]
>  (gdb) run
>  Starting program: /home/abuild/rpmbuild/BUILD/mtr-0.87/mtr 127.0.0.1
>  [...]
>  Program received signal SIGSEGV, Segmentation fault.
>  _nc_init_acs_sp (address@hidden) at ../ncurses/tinfo/lib_acs.c:95
>  95                  real_map[j] = 0;
>  (gdb) list
>  90           * the mapping information in the SCREEN struct so we can decide 
> how to
>  91           * render it.
>  92           */
>  93          if (real_map != fake_map) {
>  94              for (j = 1; j < ACS_LEN; ++j) {
>  95                  real_map[j] = 0;
>  96                  fake_map[j] = A_ALTCHARSET | (chtype) j;
>  97                  if (SP_PARM)
>  98                      SP_PARM->_screen_acs_map[j] = FALSE;
>  99              }

hmm - I seem to recall some recent change here, but the source says it's
been months.  I ran a quick check using the configure options I got from
a previous discussion with you, but valgrind hasn't anything to say about
the code, either.

Which patchdate is the breakage from?  (I'm assuming 20170408).
When was the previous (working) version?

I see that $TERM is "xterm".
What locale settings are you using?

>  (gdb) print real_map
>  $1 = (chtype *) 0x0
>  (gdb)
>  (gdb) bt
>  #0  _nc_init_acs_sp (address@hidden) at ../ncurses/tinfo/lib_acs.c:95
>  #1  0x00007ffff769ea30 in _nc_setupscreen_sp (address@hidden, 
> slines=<optimized out>, scolumns=<optimized out>, 
>      address@hidden <_IO_2_1_stdout_>, filtered=<optimized out>, 
> address@hidden) at ../ncurses/base/lib_set_term.c:586
>  #2  0x00007ffff769ab81 in newterm_sp (sp=<optimized out>, address@hidden 
> "xterm", ofp=<optimized out>, ifp=<optimized out>)
>      at ../ncurses/base/lib_newterm.c:222
>  #3  0x00007ffff769b0bc in newterm (address@hidden "xterm", ofp=<optimized 
> out>, ifp=<optimized out>) at ../ncurses/base/lib_newterm.c:352
>  #4  0x00007ffff7697276 in initscr () at ../ncurses/base/lib_initscr.c:89
>  #5  0x0000555555559e0d in mtr_curses_open () at curses.c:700
>  #6  0x0000555555560b11 in display_open () at display.c:101
>  #7  0x0000555555557e81 in main (argc=<optimized out>, argv=<optimized out>) 
> at mtr.c:779
> 
> Werner
> 
> -- 
>   "Having a smoking section in a restaurant is like having
>           a peeing section in a swimming pool." -- Edward Burr



> _______________________________________________
> Bug-ncurses mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/bug-ncurses


-- 
Thomas E. Dickey <address@hidden>
http://invisible-island.net
ftp://invisible-island.net

signature.asc
Description: Digital signature