From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751567Ab0DUGUW (ORCPT ); Wed, 21 Apr 2010 02:20:22 -0400 Received: from mail.skyhub.de ([78.46.96.112]:59983 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750780Ab0DUGUU (ORCPT ); Wed, 21 Apr 2010 02:20:20 -0400 Date: Wed, 21 Apr 2010 08:20:15 +0200 From: Borislav Petkov To: "Rafael J. Wysocki" Cc: Rik van Riel , Linux Kernel Mailing List , Kernel Testers List , Maciej Rutecki , Kent Overstreet , Ingo Molnar , Peter Zijlstra Subject: Re: [Bug #15672] KVM bug, git bisected Message-ID: <20100421062015.GB3839@liondog.tnic> Mail-Followup-To: Borislav Petkov , "Rafael J. Wysocki" , Rik van Riel , Linux Kernel Mailing List , Kernel Testers List , Maciej Rutecki , Kent Overstreet , Ingo Molnar , Peter Zijlstra References: <4BCE188A.1060408@redhat.com> <4BCE72D6.6010809@redhat.com> <201004210702.02129.rjw@sisk.pl> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <201004210702.02129.rjw@sisk.pl> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Rafael J. Wysocki" Date: Wed, Apr 21, 2010 at 07:02:02AM +0200 > On Wednesday 21 April 2010, Rik van Riel wrote: > > On 04/20/2010 05:11 PM, Rik van Riel wrote: > > > On 04/19/2010 11:19 PM, Rafael J. Wysocki wrote: > > >> This message has been generated automatically as a part of a summary > > >> report > > >> of recent regressions. > > >> > > >> The following bug entry is on the current list of known regressions > > >> from 2.6.33. Please verify if it still should be listed and let the > > >> tracking team > > >> know (either way). > > >> > > >> > > >> Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=15672 > > >> Subject : KVM bug, git bisected > > >> Submitter : Kent Overstreet > > >> Date : 2010-03-27 12:43 (24 days old) > > >> First-Bad-Commit: > > >> http://kernel.org/git/linus/5beb49305251e5669852ed541e8e2f2f7696c53e > > >> Message-ID :<4BADFD74.8060904@gmail.com> > > >> References : http://marc.info/?l=linux-kernel&m=126969385121711&w=2 > > > > > > Should be fixed by commit ea90002b0fa7bdee86ec22eba1d951f30bf043a6 > > > > Never mind me - this is a harmless (but loud) overflow > > of PREEMPT_BITS in the preempt count. > > OK, what am I supposed to do with this entry, then? Close? FWIW, I hit that warning too when chasing the anon_vma regression. It seems on certain workloads (for me it was several kvm guests) we're close to max preemption depth. Anyway, adding some more people to Cc. -- Regards/Gruss, Boris. From mboxrd@z Thu Jan 1 00:00:00 1970 From: Borislav Petkov Subject: Re: [Bug #15672] KVM bug, git bisected Date: Wed, 21 Apr 2010 08:20:15 +0200 Message-ID: <20100421062015.GB3839@liondog.tnic> References: <4BCE188A.1060408@redhat.com> <4BCE72D6.6010809@redhat.com> <201004210702.02129.rjw@sisk.pl> Mime-Version: 1.0 Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alien8.de; s=alien8; t=1271830818; bh=ihvcpCs10t4wGoqNQImu/WYjzGa6xBXc8wZeRIFzZU4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:In-Reply-To; b=isS7JcX4FHBjA2rJYDi8M4ckzhqK7h1aavbWTr U/rMuF5LXNGrLPGkmNrJ3iqqBAQxzXy9faJKX3W8PFrygRbH63UkCEpeyxAKDRvoot8 s6wZ7XaXgPeFw9BQYs8NhWB8YYeY9SK3oQIMrnDFafg7bOGCb9p2BAQLr58Pd4Aexg= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alien8.de; s=alien8; t=1271830817; bh=ihvcpCs10t4wGoqNQImu/WYjzGa6xBXc8wZeRIFzZU4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:In-Reply-To; b=F+H6pgdqVHp040g8jX/z3SPYVjk0FWmAtIWEza YMmt5efjlLfVj2cDKEQdV4WepAe7a0/5gPLoqpRK/dPdFkBMhjqrwrzNQHjoVBo2f2s yGaQlU1yjCS27tbJaL+Kra8uhNQZzxgYGbhQx0xhBcArTXM6uNnHIt6Xno8i7+pqVQ= Content-Disposition: inline In-Reply-To: <201004210702.02129.rjw-KKrjLPT3xs0@public.gmane.org> Sender: kernel-testers-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: "Rafael J. Wysocki" Cc: Rik van Riel , Linux Kernel Mailing List , Kernel Testers List , Maciej Rutecki , Kent Overstreet , Ingo Molnar , Peter Zijlstra From: "Rafael J. Wysocki" Date: Wed, Apr 21, 2010 at 07:02:02AM +0200 > On Wednesday 21 April 2010, Rik van Riel wrote: > > On 04/20/2010 05:11 PM, Rik van Riel wrote: > > > On 04/19/2010 11:19 PM, Rafael J. Wysocki wrote: > > >> This message has been generated automatically as a part of a summary > > >> report > > >> of recent regressions. > > >> > > >> The following bug entry is on the current list of known regressions > > >> from 2.6.33. Please verify if it still should be listed and let the > > >> tracking team > > >> know (either way). > > >> > > >> > > >> Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=15672 > > >> Subject : KVM bug, git bisected > > >> Submitter : Kent Overstreet > > >> Date : 2010-03-27 12:43 (24 days old) > > >> First-Bad-Commit: > > >> http://kernel.org/git/linus/5beb49305251e5669852ed541e8e2f2f7696c53e > > >> Message-ID :<4BADFD74.8060904-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> > > >> References : http://marc.info/?l=linux-kernel&m=126969385121711&w=2 > > > > > > Should be fixed by commit ea90002b0fa7bdee86ec22eba1d951f30bf043a6 > > > > Never mind me - this is a harmless (but loud) overflow > > of PREEMPT_BITS in the preempt count. > > OK, what am I supposed to do with this entry, then? Close? FWIW, I hit that warning too when chasing the anon_vma regression. It seems on certain workloads (for me it was several kvm guests) we're close to max preemption depth. Anyway, adding some more people to Cc. -- Regards/Gruss, Boris.