Re: Window destroy = program crash?

["David J. Topper" <topper virginia edu>]

Owen Taylor wrote:

> Segfault in free == memory corruption somewhere else in
> your app. It's most likely a double free - to catch that
> on Linux, try:
>
>  $ gdb myprog
>  (gdb) set env MALLOC_CHECK_=2
>  (gdb) r

Hey, thanks a bunch.  That seems useful.  I at least get a halt right away,
but nothing points to my code.  Instead, there's a backtrace of around 50
function calls, starting with:

#0  0x402df4c1 in kill () from /lib/libc.so.6
#1  0x402df12a in raise () from /lib/libc.so.6
#2  0x402e06ff in abort () from /lib/libc.so.6
#3  0x4031a8b1 in malloc_set_state () from /lib/libc.so.6
#4  0x40318a3c in free () from /lib/libc.so.6
#5  0x40174855 in g_free (mem=0x808d3f0) at gmem.c:411
#6  0x40079de6 in gtk_entry_finalize (object=0x808ce80) at gtkentry.c:537
#7  0x400b3f9a in gtk_object_unref (object=0x808ce80) at gtkobject.c:1194
#8  0x400b220a in gtk_object_destroy (object=0x808ce80) at gtkobject.c:247
#9  0x400fa962 in gtk_widget_destroy (widget=0x808ce80) at gtkwidget.c:1388
#10 0x4004625b in gtk_box_forall (container=0x808cde0, include_internals=0,
    callback=0x804a670 <gtk_widget_destroy>, callback_data=0x0) at
gtkbox.c:786
#11 0x400657cb in gtk_container_foreach (container=0x808cde0,
    callback=0x804a670 <gtk_widget_destroy>, callback_data=0x0)
    at gtkcontainer.c:1125
#12 0x40064834 in gtk_container_destroy (object=0x808cde0)
    at gtkcontainer.c:631
#13 0x400a2737 in gtk_marshal_NONE__NONE (object=0x808cde0,
    func=0x4006478c <gtk_container_destroy>, func_data=0x0, args=0xbfffdcc4)

    at gtkmarshal.c:312
#14 0x400ccebb in gtk_signal_real_emit (object=0x808cde0, signal_id=1,
    params=0xbfffdcc4) at gtksignal.c:1492
#15 0x400cb16d in gtk_signal_emit (object=0x808cde0, signal_id=1)

Now I certainly admit there might be some memory mashing going on in my app,
but I'm at a loss to find out where / why.  What exactly does that malloc
check do for me?

Well, it seems as though I'm doing the right thing wrt: window anyhow.

DT