Re: Race condition in ptrace

[Nick Piggin]

Bodo Stroesser wrote:
> Nick Piggin wrote:
>
> > Bodo Stroesser wrote:

> > I don't see how this could help because AFAIKS, child->saving is only
> > set and cleared while the runqueue is locked. And the same runqueue lock
> > is taken by wait_task_inactive.
>
> Sorry, that not right. There are some routines called by sched(), that 
> release
> and reacquire the runqueue lock.

Oh yeah, it is the wake_sleeping_dependent / dependent_sleeper crap.
Sorry, you are right. And that's definitely a bug in sched.c, because
it breaks wait_task_inactive, as you've rightly observed.

Andrew, IMO this is another bug to hold 2.6.11 for.

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