Re: [patch, lock validator] fix uidhash_lock <-> RCU deadlock


On Thu, 26 Jan 2006, Paul E. McKenney wrote:
>
> On Wed, Jan 25, 2006 at 03:23:07PM +0100, Ingo Molnar wrote:
> > RCU task-struct freeing can call free_uid(), which is taking 
> > uidhash_lock - while other users of uidhash_lock are softirq-unsafe.
> 
> I guess I get to feel doubly stupid today.  Good catch, great tool!!!

I wonder if the right fix wouldn't be to free the user struct early, 
instead of freeing it from RCU. Hmm?

		Linus
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Follow-Ups:
- Re: [patch, lock validator] fix uidhash_lock <-> RCU deadlock
  - From: "Paul E. McKenney" <[email protected]>
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  - From: "Paul E. McKenney" <[email protected]>

References:
- [patch, lock validator] fix uidhash_lock <-> RCU deadlock
  - From: Ingo Molnar <[email protected]>
- Re: [patch, lock validator] fix uidhash_lock <-> RCU deadlock
  - From: "Paul E. McKenney" <[email protected]>

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