Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934489AbcJROwv (ORCPT ); Tue, 18 Oct 2016 10:52:51 -0400 Received: from mx1.redhat.com ([209.132.183.28]:46846 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932186AbcJROwm (ORCPT ); Tue, 18 Oct 2016 10:52:42 -0400 Date: Tue, 18 Oct 2016 16:52:38 +0200 From: Igor Mammedov To: Mike Galbraith Cc: linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de, torvalds@linux-foundation.org Subject: Re: regression since 4.8 and newer in select_idle_siblings() Message-ID: <20161018165238.2d38643b@nial.brq.redhat.com> In-Reply-To: <1476799327.11338.1.camel@gmx.de> References: <20161018154025.1e686cad@nial.brq.redhat.com> <1476799327.11338.1.camel@gmx.de> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Tue, 18 Oct 2016 14:52:41 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 705 Lines: 22 On Tue, 18 Oct 2016 16:02:07 +0200 Mike Galbraith 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 > > 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