Re: [PATCH 1/1] rtmutex: Handle when top lock owner changes

[Thomas Gleixner]

On Thu, 5 Jun 2014, Steven Rostedt wrote:
> On Wed, 4 Jun 2014 17:32:37 +0200 (CEST)
> Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
> +	/*
> +	 * When we dropped the spinlocks, if the owner of the lock we
> +	 * are currently processing changed since we chain walked
> +	 * to that lock, we are done with the chain walk. The previous
> +	 * owner was obviously running to release it.
> +	 */
> +	if (lock && rt_mutex_owner(lock) != task)
> +		goto out_unlock_pi;

NO. You CANNOT derefernce lock after dropping the locks. It might be
gone already.

Thanks,

	tglx
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/