From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from youngberry.canonical.com ([91.189.89.112]:45347 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750749AbcC3LEG (ORCPT ); Wed, 30 Mar 2016 07:04:06 -0400 Date: Wed, 30 Mar 2016 12:04:02 +0100 From: Luis Henriques To: Owen Hofmann Cc: stable@vger.kernel.org Subject: Re: [PATCH] cpu: Defer smpboot kthread unparking until CPU known to scheduler Message-ID: <20160330110402.GA4783@ares> References: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Sender: stable-owner@vger.kernel.org List-ID: On Wed, Mar 16, 2016 at 05:38:05PM -0700, Owen Hofmann wrote: > Hi, this is a request to please include upstream commit > 00df35f991914db6b8bde8cf09808e19a9cffc3d ("cpu: Defer smpboot kthread > unparking until CPU known to scheduler") in stable trees >= 3.15 and < > 4.1. > > Upstream dd9d3843755da95f63dd3a376f62b3e45c011210 ("sched: Fix > cpu_active_mask/cpu_online_mask race") was included in stable to fix a > race condition that led to kthreads running on the wrong cpu and > causing errors like "kernel BUG at kernel/smpboot.c:135!". This is > especially likely when running as a virtualized guest. > > However, the fix depends on the ordering introduced in the requested > patch, so the issue remains in kernels between 3.15 when the bug was > introduced, and 4.1 which has 00df35f9. > -- > To unsubscribe from this list: send the line "unsubscribe stable" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html Thanks Owen, I'll queue this for the 3.16 kernel. Cheers, -- Lu�s