--
On Tue, 31 Jul 2007, john stultz wrote:
> On Wed, 2007-05-30 at 17:49 -0700, john stultz wrote:
>
> Hey Ingo,
> I sent this fix for this back in the 2.6.21-rt9 era, and I thought to
> picked it up, but I think it arrived amid some futex churn and
> apparently has been dropped or was just lost.
>
> Some of our testers have been reporting futex deadlocks and this fix
> resolves it, so I believe it to still be needed.
Heh, I remember this bug. Wasn't there another patch that modified this.
I almost definitly remember this getting into the patch queue, but it must
have been dropped later.
John, thanks for looking into this deeper!
Acked-by: Steven Rostedt <[email protected]>
>
> thanks
> -john
>
> Avoid futex_unlock_pi returning -EFAULT (which results in deadlock), by
> clearing uval before jumping to retry_locked.
>
> Signed-off-by: John Stultz <[email protected]>
> Index: 2.6-rt/kernel/futex.c
> ===================================================================
> --- 2.6-rt.orig/kernel/futex.c 2007-07-31 16:48:41.000000000 -0700
> +++ 2.6-rt/kernel/futex.c 2007-07-31 16:48:48.000000000 -0700
> @@ -1673,6 +1673,7 @@ pi_faulted:
> attempt);
> if (ret)
> goto out;
> + uval = 0;
> goto retry_unlocked;
> }
>
>
>
>
>
-
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