linux-kernel - Re: [PATCH] futex: fix unbalanced spin_lock/spin_unlock() in exit_pi_state

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Message-ID: <CAM2zO=A8UvTizpHWmkaxH+nT+yusmFFKagq3BNDAQ+XB0EBxhw@mail.gmail.com>
Date:	Fri, 1 Mar 2013 13:58:52 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: [PATCH] futex: fix unbalanced spin_lock/spin_unlock() in exit_pi_state_list()

On Fri, Mar 1, 2013 at 9:36 AM, Yong Zhang <yong.zhang0@...il.com> wrote:
> --- a/kernel/futex.c
> +++ b/kernel/futex.c
> @@ -562,16 +562,17 @@ void exit_pi_state_list(struct task_struct *curr)
>
>                 spin_lock(&hb->lock);
>
> -               raw_spin_lock_irq(&curr->pi_lock);
>                 /*
>                  * We dropped the pi-lock, so re-check whether this
>                  * task still owns the PI-state:
>                  */
>                 if (head->next != next) {

Just ignore this patch, race window is opened here.
New patch comes soon.

Thanks,
Yong

>                         spin_unlock(&hb->lock);
> +                       raw_spin_lock_irq(&curr->pi_lock);
>                         continue;
>                 }
>
> +               raw_spin_lock_irq(&curr->pi_lock);
>                 WARN_ON(pi_state->owner != curr);
>                 WARN_ON(list_empty(&pi_state->list));
>                 list_del_init(&pi_state->list);
> --
> 1.7.9.5
>



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