From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ig0-f176.google.com (mail-ig0-f176.google.com [209.85.213.176]) by kanga.kvack.org (Postfix) with ESMTP id B8DAE6B0038 for ; Fri, 20 Mar 2015 20:34:46 -0400 (EDT) Received: by igcau2 with SMTP id au2so1714334igc.0 for ; Fri, 20 Mar 2015 17:34:46 -0700 (PDT) Received: from mail-ig0-x22a.google.com (mail-ig0-x22a.google.com. [2607:f8b0:4001:c05::22a]) by mx.google.com with ESMTPS id dr13si245524icb.24.2015.03.20.17.34.46 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 20 Mar 2015 17:34:46 -0700 (PDT) Received: by igcau2 with SMTP id au2so1328574igc.1 for ; Fri, 20 Mar 2015 17:34:46 -0700 (PDT) Date: Fri, 20 Mar 2015 17:34:44 -0700 (PDT) From: David Rientjes Subject: Re: 4.0.0-rc4: panic in free_block In-Reply-To: <550CB8D1.9030608@oracle.com> Message-ID: References: <550C37C9.2060200@oracle.com> <550CA3F9.9040201@oracle.com> <550CB8D1.9030608@oracle.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: David Ahern Cc: Linus Torvalds , linux-mm , LKML 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. -- 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