Re: [CRED bug?] 2.6.29-rc3 don't survive on stress workload

[David Howells]

KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx> wrote:

> f6  : 1003e6b6b6b6b6b6b6b6b f7  : 0ffe6af8e85a500000000

I'd guess you now have CONFIG_DEBUG_SLAB turned on.  That looks like slab
poisoning in register f6.

> r17 : 00000000dead4ead r18 : a000000100cd2274 r19 : a000000100d6b6c0

And that looks like SPINLOCK_MAGIC in r17, so I'd guess something just
successfully validated a spinlock, possibly atomic_dec_and_lock() in
free_uid().

This may mean that the user_struct being released is valid, but the
user_namespace it refers to is already released.

David
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