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SubjectRe: Race condition in ptrace
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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