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

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Message-ID: <1476799327.11338.1.camel@gmx.de>
Date:   Tue, 18 Oct 2016 16:02:07 +0200
From:   Mike Galbraith <efault@....de>
To:     Igor Mammedov <imammedo@...hat.com>, linux-kernel@...r.kernel.org
Cc:     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, 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

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

	-Mike