Messages in this thread Patch in this message | | | Date | Sat, 01 Jun 2002 01:40:03 -0700 | From | Andrew Morton <> | Subject | [patch 2/16] list_head debugging |
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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.
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--- 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); + /* + * This is debug. Remove it when the kernel has no bugs ;) + */ + entry->next = 0; + entry->prev = 0; } /** - - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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