From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-f172.google.com (mail-ob0-f172.google.com [209.85.214.172]) by kanga.kvack.org (Postfix) with ESMTP id 44EFD6B006C for ; Fri, 20 Mar 2015 20:48:04 -0400 (EDT) Received: by obbgg8 with SMTP id gg8so89487288obb.1 for ; Fri, 20 Mar 2015 17:48:04 -0700 (PDT) Received: from aserp1040.oracle.com (aserp1040.oracle.com. [141.146.126.69]) by mx.google.com with ESMTPS id kg7si3211740obb.56.2015.03.20.17.48.03 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Fri, 20 Mar 2015 17:48:03 -0700 (PDT) Message-ID: <550CBDB8.1090501@oracle.com> Date: Fri, 20 Mar 2015 18:39:20 -0600 From: David Ahern MIME-Version: 1.0 Subject: Re: 4.0.0-rc4: panic in free_block References: <550C37C9.2060200@oracle.com> <550CA3F9.9040201@oracle.com> <550CB8D1.9030608@oracle.com> In-Reply-To: Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: David Rientjes Cc: Linus Torvalds , linux-mm , LKML On 3/20/15 6:34 PM, David Rientjes wrote: > On Fri, 20 Mar 2015, David Ahern wrote: > >> Here's another data point: If I disable NUMA I don't see the problem. >> Performance drops, but no NULL pointer splats which would have been panics. >> >> The 128 cpu ldom with NUMA enabled shows the problem every single time I do a >> kernel compile (-j 128). With NUMA disabled I have done 3 allyesconfig >> compiles without hitting the problem. I'll put the compiles into a loop while >> I head out for dinner. >> > > It might be helpful to enable CONFIG_DEBUG_SLAB if you're reproducing it. > I enabled that and a few other DEBUG configs earlier -- nothing popped out. I'll do it again -- and others when I return. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org