Re: [RFC] is_global_init() called on global init sub-thread

[Serge E. Hallyn]

On Fri, Jan 01, 2016 at 10:10:35AM +0900, Sergey Senozhatsky wrote:
> On (12/31/15 19:08), Serge E. Hallyn wrote:
> > > re-upping https://www.redhat.com/archives/linux-audit/2013-December/msg00086.html
> > > 
> > > Oleg Nesterov wrote:
> > > 
> > > :Because is_global_init() is only true for the main thread of /sbin/init.
> > > :
> > > :Just look at oom_unkillable_task(). It tries to not kill init. But, say,
> > > :select_bad_process() can happily find a sub-thread of is_global_init()
> > > :and still kill it.
> > > 
> > > this is still the case, isn't it? at least in some -stable kernels.
> > > is there (or was there) any reason this change has never been committed?
> > > (I'm particularly interested in is_global_init()).
> > 
> > ...  seems like it makes sense.  Can you remind us which init you're having
> > to deal with?
> > 
> 
> systemd
> 
> 	-ss

Well it makes sense to me.  The question is whether we are protecting the
thing running as init, or the 'physical' thread with pid 1.  I think it's
the former, so let's push on this.  Please resend the patch with a proper
signed-off-by, and feel free to add

Acked-by: Serge Hallyn <serge.hallyn@xxxxxxxxxxxxx>

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