Re: [uml-devel] Re: [uml-user] Host processes never terminate on 2.6.9rc3 host (stuck in ptrace_stop)

[BlaisorBlade <blaisorblade_spam@yahoo.it>]

On Tuesday 19 October 2004 07:00, Werner Almesberger wrote:
> BlaisorBlade wrote:
> > Can you try using SIGCONT, please? Even the patch changelog clearly says
> > that you must kill -CONT before kill -KILL
>
> That looks like a race condition.

> If the process manages to enter 
> the same state again before you get to KILL it,
Why? This does not make sense, IMHO - after a SIGCONT it should keep running  
until something *requests* it stopping - or not? I'm not finding a clue in 
the sources... it's quite difficult.
> even this "advanced" 
> kill is lost.

> > (actually, a kill -CONT may make the process notice the SIGKILL),

> That's what works so far, yes. I'm actually no quite certain what
> this thread is about: it sounds as if this was a new problem, but
> we've required CONT with KILL in some cases already for a long
> time.

> > Quite frankly, I do not know the question myself - but people
> > seem to agree that this is a correct behaviour.

> The odd thing is that a process that was ptraced but whose ptracer
> is long dead *still* needs the CONT. That doesn't look right to me.
I remember that on Slackware, when doing "init 1" it sends even kill -CONT to 
all processes, so either they think it's correct or they want to workaround 
an issue existing for lots of kernel releases.

Bye
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729


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