Messages in this thread | | | Date | Sat, 1 Jun 2002 14:19:02 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [patch 2/16] list_head debugging |
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Em Sat, Jun 01, 2002 at 01:40:03AM -0700, Andrew Morton escreveu: > A common and very subtle bug is to use list_heads which aren't on any > lists. It causes kernel memory corruption which is observed long after > the offending code has executed.
> The patch nulls out the dangling pointers so we get a nice oops at the > site of the buggy code.
> ===================================== > > --- 2.5.19/include/linux/list.h~list-debug Sat Jun 1 01:18:05 2002 > +++ 2.5.19-akpm/include/linux/list.h Sat Jun 1 01:18:05 2002 > @@ -94,6 +94,11 @@ static __inline__ void __list_del(struct > static __inline__ void list_del(struct list_head *entry) > { > __list_del(entry->prev, entry->next);
#ifdef CONFIG_DEBUG_LIST_DEL_NULLIFY
> + entry->next = 0; > + entry->prev = 0;
#endif
> }
8) And get this configured in the Debug section of make *config
The kernel will always have bugs ;)
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