Re: Linux 3.1-rc9

[Linus Torvalds]

On Tue, Oct 18, 2011 at 12:48 PM, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
>
> It does not look related.

Yeah, the only lock held there seems to be the socket lock, and it
looks like all CPU's are spinning on it.

> Could you try to reproduce that problem with
> lockdep enabled? lockdep might make it go away, but it's definitely
> worth a try.

And DEBUG_SPINLOCK / DEBUG_SPINLOCK_SLEEP too. Maybe you're triggering
some odd networking thing.  It sounds unlikely, but maybe some error
case you get into doesn't release the socket lock.

I think PROVE_LOCKING already enables DEBUG_SPINLOCK, but the sleeping
lock thing is separate, iirc.

                    Linus
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