wxruby development - Nov 2006 - [ wxruby-Bugs-6808 ] Double-free segfault on closing app when BitmapButton has been used

Bugs item #6808, was opened at 2006-11-21 21:41
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http://rubyforge.org/tracker/?func=detail&atid=218&aid=6808&group_id=35

Category: Incorrect behavior
Group: None
Status: Open
Resolution: None
Priority: 2
Submitted By: Alex Fenton (brokentoy)
Assigned to: Kevin Smith (qualitycode)
Summary: Double-free segfault on closing app when BitmapButton has been used

Initial Comment:
If an application has used the BitmapButton class it might segfault instead of
exiting cleanly. This can be demonstrated by starting the bigdemo, opening the
''Core Controls/wxBitmapButton'' demo, then shutting the
application.

It appears to be because wxBitmap does reference counting of its own, and tries
to free the underlying memory containing the image on exit.

On OS X 10.3 it gives the following backtrace:

Program received signal EXC_BAD_ACCESS, Could not access memory.
0x81800100 in ?? ()
(gdb) whe
#0  0x81800100 in ?? ()
Cannot access memory at address 0x81800100
Cannot access memory at address 0x81800100
#1  0x031d82b4 in wxBitmapRefData::Free() ()
#2  0x031d831c in wxBitmapRefData::~wxBitmapRefData() ()
#3  0x031bc450 in wxObject::UnRef() ()
#4  0x031d87a0 in wxBitmap::~wxBitmap() ()
#5  0x02e17ad0 in SwigDirector_wxBitmap::~SwigDirector_wxBitmap() ()
#6  0x0001d6f0 in rb_gc_call_finalizer_at_exit () at gc.c:1858
#7  0x000041d4 in ruby_finalize_1 () at eval.c:1418
#8  0x00004340 in ruby_cleanup (ex=0) at eval.c:1453
#9  0x000044b8 in ruby_stop (ex=105048432) at eval.c:1484
#10 0x00004544 in ruby_run () at eval.c:1505
#11 0x0000209c in main (argc=3, argv=0xbffff95c, envp=0xa02b08c8) at main.c:46
#12 0x00001b5c in _start (argc=3, argv=0xbffff95c, envp=0xbffff96c) at
/SourceCache/Csu/Csu-47/crt.c:267
#13 0x8fe1a31c in __dyld__dyld_start ()

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