* Thomas Gleixner <[email protected]> wrote:
> From: Ingo Molnar <[email protected]>
>
> 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)
Ingo
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