Re: [PATCH] release_task: kill the no longer needed get/put_pid(thread_pid)

[Oleg Nesterov <oleg@redhat.com>]

On 04/14, Christian Brauner wrote:
>
> On Mon, Apr 14, 2025 at 09:39:47PM +0200, Christian Brauner wrote:
> > On Fri, Apr 11, 2025 at 02:18:57PM +0200, Oleg Nesterov wrote:
> > > -	put_pid(thread_pid);
> > > +	/* p->thread_pid can't go away until free_pids() below */
> > > +	proc_flush_pid(p->thread_pid);
> >
> > This cannot work though, right?
> > Because after __unhash_process() p->thread_pid may be NULL:

Oh, indeed! What was I thinking about???

And, as you can guess, I didn't even bother to test this "obvious" cleanup :/

> The task_pid() needs to be moved after the repeat label. I'm appending
> the full patch I applied.

Thanks a lot!

Can you add your Co-developed-by or Fixed-by ?

Oleg.