linux-kernel - Re: regression since 4.8 and newer in select_idle

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Message-ID: <20161018165238.2d38643b@nial.brq.redhat.com>
Date:   Tue, 18 Oct 2016 16:52:38 +0200
From:   Igor Mammedov <imammedo@...hat.com>
To:     Mike Galbraith <efault@....de>
Cc:     linux-kernel@...r.kernel.org, mingo@...hat.com,
        peterz@...radead.org, tglx@...utronix.de,
        torvalds@...ux-foundation.org
Subject: Re: regression since 4.8 and newer in select_idle_siblings()

On Tue, 18 Oct 2016 16:02:07 +0200
Mike Galbraith <efault@....de> wrote:

> On Tue, 2016-10-18 at 15:40 +0200, Igor Mammedov wrote:
> > kernel crashes at runtime  due null pointer dereference at
> >   select_idle_sibling()  
> >      -> select_idle_cpu()  
> >          ...
> >          u64 avg_cost = this_sd->avg_scan_cost;
> > 
> > regression bisects to:
> >   commit 10e2f1acd0106c05229f94c70a344ce3a2c8008b
> >   Author: Peter Zijlstra <peterz@...radead.org>
> >   sched/core: Rewrite and improve select_idle_siblings()  
> 
> http://git.kernel.org/tip/9cfb38a7ba5a9c27c1af8093fb1af4b699c0a441

Thanks, above patch fixes issue for me.

> Already fixed, and will land in Linus' tree soon.
> 
> 	-Mike