Re: [Bug-guile-ncurses] Crash in simple program.

[John Darrington]

On Sat, May 07, 2016 at 07:35:55AM +0000, Mike Gran wrote:
     >     
     > 
http://git.savannah.gnu.org/cgit/guile-ncurses.git/commit/?id=c2732a854dc8823099787bd40bebf8339ded0df6
     >     
     > 
     > But now, the assertion in gc_free_panel fires.  panel_type.c:152
     > 
     
     I'm having a tough time reproducing a lot of things that you've seen.

That is the non-deterministic nature of the GC I suppose. 
     
     What are your CFLAGS?

$ ./config.status --config
'CFLAGS=-O0 -g -I /Scratch/john/ncurses/include' 
'--prefix=/Scratch/john/guile-ncurses' 'LDFLAGS=-L/Scratch/john/ncuses/lib'

(I'm linking against a version of curses6 with full tracing enabled)

     

But in this case, it seems clear to me that this assertion will happen.  
Because gucu_del_panel calls
gc_free_panel  which calls SCM_SET_SMOB_DATA (x, NULL).   Therefore, in the 
next call to gc_free_panel
(from the GC) the line gp = (struct gucu_panel *) SCM_SMOB_DATA (x); is going 
to set gp to NULL.

J'

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