From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e23smtp05.au.ibm.com (e23smtp05.au.ibm.com [202.81.31.147]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "e23smtp05.au.ibm.com", Issuer "Equifax" (verified OK)) by ozlabs.org (Postfix) with ESMTPS id 17C34B7BC2 for ; Fri, 13 Nov 2009 12:37:35 +1100 (EST) Received: from d23relay04.au.ibm.com (d23relay04.au.ibm.com [202.81.31.246]) by e23smtp05.au.ibm.com (8.14.3/8.13.1) with ESMTP id nAD1Ycwc031306 for ; Fri, 13 Nov 2009 12:34:38 +1100 Received: from d23av02.au.ibm.com (d23av02.au.ibm.com [9.190.235.138]) by d23relay04.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id nAD1YMEI1568884 for ; Fri, 13 Nov 2009 12:34:22 +1100 Received: from d23av02.au.ibm.com (loopback [127.0.0.1]) by d23av02.au.ibm.com (8.14.3/8.13.1/NCO v10.0 AVout) with ESMTP id nAD1bXVs018536 for ; Fri, 13 Nov 2009 12:37:33 +1100 Date: Fri, 13 Nov 2009 12:37:29 +1100 From: David Gibson To: Sachin Sant Subject: Re: [powerpc] Next tree Nov 2 : kernel BUG at mm/mmap.c:2135! Message-ID: <20091113013729.GB18848@yookeroo.seuss> References: <20091102173845.210d1c57.sfr@canb.auug.org.au> <4AEEA279.4040106@in.ibm.com> <4AF175D4.7030507@in.ibm.com> <20091105001650.GD3613@yookeroo.seuss> <4AFBEE98.2070208@in.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <4AFBEE98.2070208@in.ibm.com> Cc: Linux/PPC Development , linux-next@vger.kernel.org, Stephen Rothwell List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Thu, Nov 12, 2009 at 04:46:40PM +0530, Sachin Sant wrote: > David Gibson wrote: > >On Wed, Nov 04, 2009 at 06:08:44PM +0530, Sachin Sant wrote: > >>Sachin Sant wrote: > >>>Today's next tree failed to boot on a POWER 6 box with : > >>> > >>>------------[ cut here ]------------ > >>>kernel BUG at mm/mmap.c:2135! > >>>Oops: Exception in kernel mode, sig: 5 [#2] > >>>SMP NR_CPUS=1024 NUMA pSeries > >>Problem exists with today's next as well. > >> > >>Likely cause for this problem seems to the following commit. > >>If i revert this patch the machine boots fine. > >> > >>commit a0668cdc154e54bf0c85182e0535eea237d53146 > >>powerpc/mm: Cleanup management of kmem_caches for pagetables > > > >Ugh. Ok, it's not at all obvious how my patch could cause this bug. > >Can you send your .config? > > > Still present in today's next. Sorry, I've been sidetracked by other issues and have only managed to look into this today. My initial attempts to reproduce the bug with your config on both POWER6 and POWER5+ have failed though. Is it possible to get the complete boot log from this system - not just the [cut here] section around the BUG()? This should help to determine exactly when during boot the bug is being triggered. -- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson