Re: [PATCH] namespaces: fix exit race by splitting exit

[Oleg Nesterov <oleg@tv-sign.ru>]

On 01/26, Daniel Hokka Zakrisson wrote:
>
> Serge E. Hallyn wrote:
> > Ok, could you verify that the following patch at least solves
> > the oopsing?
> >
> > (I can't reproduce the oops with Daniel's test prog)
> >
> > thanks,
> > -serge
> 
> Indeed, this patch solves the oopsing, but so did the last one. I think I
> finally managed to figure out why too, as release_task would be called
> with current referring to the parent process, or whoever is reaping the
> process with the last reference to the namespace. Right?

Not always. The task can do release_task() on itself if it is sub-thread,
or its parent ignores SIGCHLD.

Anyway I think your explanation is correct for this particular test-case.

Oleg.

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