Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933734AbaKSV4f (ORCPT ); Wed, 19 Nov 2014 16:56:35 -0500 Received: from www.linutronix.de ([62.245.132.108]:47732 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933043AbaKSV4c (ORCPT ); Wed, 19 Nov 2014 16:56:32 -0500 Date: Wed, 19 Nov 2014 22:56:26 +0100 (CET) From: Thomas Gleixner To: Frederic Weisbecker cc: Linus Torvalds , Dave Jones , Don Zickus , Linux Kernel , the arch/x86 maintainers , Peter Zijlstra , Andy Lutomirski , Arnaldo Carvalho de Melo Subject: Re: frequent lockups in 3.18rc4 In-Reply-To: <20141119190215.GA10796@lerouge> Message-ID: References: <20141118023930.GA2871@redhat.com> <20141118145234.GA7487@redhat.com> <20141118215540.GD35311@redhat.com> <20141119021902.GA14216@redhat.com> <20141119145902.GA13387@redhat.com> <20141119190215.GA10796@lerouge> User-Agent: Alpine 2.11 (DEB 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 19 Nov 2014, Frederic Weisbecker wrote: > I got a report lately involving context tracking. Not sure if it's > the same here but the issue was that context tracking uses per cpu data > and per cpu allocation use vmalloc and vmalloc'ed area can fault due to > lazy paging. This is complete nonsense. pcpu allocations are populated right away. Otherwise no single line of kernel code which uses dynamically allocated per cpu storage would be safe. Thanks, tglx -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/