From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263159AbUHDKEq (ORCPT ); Wed, 4 Aug 2004 06:04:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263775AbUHDKEq (ORCPT ); Wed, 4 Aug 2004 06:04:46 -0400 Received: from e35.co.us.ibm.com ([32.97.110.133]:429 "EHLO e35.co.us.ibm.com") by vger.kernel.org with ESMTP id S263159AbUHDKEo (ORCPT ); Wed, 4 Aug 2004 06:04:44 -0400 Date: Wed, 4 Aug 2004 15:36:42 +0530 From: Srivatsa Vaddagiri To: Nathan Lynch Cc: dipankar@in.ibm.com, Joel Schopp , Rusty Russell , lkml , Nick Piggin , zwane@linuxpower.ca Subject: Re: CPU hotplug broken in 2.6.8-rc2 ? Message-ID: <20040804100642.GA20278@in.ibm.com> Reply-To: vatsa@in.ibm.com References: <20040802094907.GA3945@in.ibm.com> <20040802095741.GA4599@in.ibm.com> <1091475519.29556.4.camel@pants.austin.ibm.com> <1091478386.29556.36.camel@pants.austin.ibm.com> <1091567239.28036.36.camel@biclops.private.network> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1091567239.28036.36.camel@biclops.private.network> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 03, 2004 at 04:07:20PM -0500, Nathan Lynch wrote: > BUG_ON(rq->nr_running != 0); > > I can reproduce this on both ppc64 and i386. Does anyone know why this > is happening? I guess some task is still stuck with the dead CPU. Can you put a breakpoint on the BUG_ON and see the ps output (in kdb) to see which task is that when you hit the breakpoint? I will also try debugging the 2.6.8-rc2 CPU Hotplug woes as soon as I can. -- Thanks and Regards, Srivatsa Vaddagiri, Linux Technology Center, IBM Software Labs, Bangalore, INDIA - 560017