One Quickie

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Break on szone_error not working (gdb->General)

Sometimes when you have memory corruption issues, the malloc library happily informs you:

Borkdoku(11062,0xcec0600) malloc: *** error for object 0xd109010: 
   incorrect checksum for freed object - object was probably modified 
   after being freed, break at szone_error to debug

Which is fine and dandy, but it lies. I've never gotten szone_error to actually do anything. Try breaking on malloc_printf instead.