Messages in this thread | | | Date | Thu, 4 May 2006 10:30:40 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH -mm] futex-pi: fix possible pi_lock deadlock |
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* Thomas Gleixner <tglx@linutronix.de> wrote:
> From: Ingo Molnar <mingo@elte.hu> > > The lock validator detected a possible deadlock between tasklist lock > and task->pi_lock. Prevent the deadlock by disabling interrupts across > pi_lock operations.
some background about how this bug sneaked in: we have pi_lock as an irq-safe lock in the -rt tree but we didnt realize that it was needed in the pi-futex implementation too. The race window is pretty narrow there so it didnt trigger during testing. (the window is wider in -rt)
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