Re: [path][rfc] add PR_DETACH prctl command

[Oleg Nesterov]

On 04/05, Stas Sergeev wrote:
>
> 05.04.2011 19:15, Oleg Nesterov wrote:
>>>
>>> +			p->detaching = 0;
>>> +			continue;
>> Yes, thanks, I didn't notice "continue". But then this is wrong again.
>> This can race with wait_task_detached() called by our sub-thread, it
>> can clear ->detaching before we check it.
> But the above code is under write_lock_irq(&tasklist_lock), so why
> would it race?

wait_task_detached() clears detaching, then it drops tasklist and takes
it for writing. forget_original_parent() can come in between.

Oleg.

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