Re: [PATCH 3/8] job control: Fix ptracer wait(2) hang and explainnotask_error clearing

From: Oleg Nesterov
Date: Mon Mar 21 2011 - 12:18:45 EST

On 03/21, Oleg Nesterov wrote:
> On 03/08, Tejun Heo wrote:
> >
> > + if (likely(!ptrace) || (wo->wo_flags & WCONTINUED))
> > + wo->notask_error = 0;
> I don't understand this part. Suppose that this task is not traced and
> its real parent does do_wait(WEXITED). We shouldn't return -ECHLD in
> this case (EXIT_ZOMBIE && delay_group_leader()).

Argh. please ingnore this part. I misread the code above.

> If the task is traced and debugger does do_wait(WEXITED) we should not
> return -ECHLD too.

Still true, or I missed something again...


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