Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932266AbbBYVwN (ORCPT ); Wed, 25 Feb 2015 16:52:13 -0500 Received: from e31.co.us.ibm.com ([32.97.110.149]:55837 "EHLO e31.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753670AbbBYVwG (ORCPT ); Wed, 25 Feb 2015 16:52:06 -0500 From: Stewart Smith To: Michael Ellerman , linuxppc-dev@ozlabs.org Cc: mingo@kernel.org, tglx@linutronix.de, Anton Blanchard , linux-kernel@vger.kernel.org Subject: Re: [PATCH] powerpc/smp: Wait until secondaries are active & online In-Reply-To: <1424761082-29938-1-git-send-email-mpe@ellerman.id.au> References: <1424761082-29938-1-git-send-email-mpe@ellerman.id.au> User-Agent: Notmuch/0.18+16~gec02089 (http://notmuchmail.org) Emacs/23.1.1 (x86_64-redhat-linux-gnu) Date: Thu, 26 Feb 2015 08:51:10 +1100 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15022521-8236-0000-0000-000009BF25AB Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 835 Lines: 25 Michael Ellerman writes: > Anton has a busy ppc64le KVM box where guests sometimes hit the infamous > "kernel BUG at kernel/smpboot.c:134!" issue during boot: > > BUG_ON(td->cpu != smp_processor_id()); > > Basically a per CPU hotplug thread scheduled on the wrong CPU. The oops > output confirms it: > > CPU: 0 > Comm: watchdog/130 Has anyone seen this on powernv before? I seem to be able to very reliably get such crashes with my (experimental) gcov enabled skiboot on P7 (and P8, but I've had more time on P7 than P8). Hoping to try the patch later today. -- 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/