On Thu, Dec 21, 2006 at 02:56:10PM +1100, Keith Owens wrote: > double unlock: ok | ok |failed|WARNING at /build/kaos/kernel.org-sgidev/linux/kernel/mutex-debug.c:83 debug_mutex_unlock() > Unable to handle kernel NULL pointer dereference (address 0000000000000000) > > mutex-debug uses DEBUG_LOCKS_WARN_ON() which indirectly calls > dump_stack which the IA64 unwind code (arch/ia64/kernel/unwind.c) calls > kmalloc. The lockdep tests are run before the slab caches have been > allocated so cpu_cache_get is called with a NULL cachep, hence the > oops. Yup. I just debugged and fixed the same problem on parisc. I didn't think to check ia64; I checked to see what x86-64 did. Unfortunately, the ia64 unwind code seems a lot more subtle and more allocation-happy than the parisc unwind code, so I'm not sure exactly how to fix ia64. - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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