From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk1-f200.google.com (mail-qk1-f200.google.com [209.85.222.200]) by kanga.kvack.org (Postfix) with ESMTP id 10C558E0038 for ; Wed, 9 Jan 2019 06:50:50 -0500 (EST) Received: by mail-qk1-f200.google.com with SMTP id w185so5995260qka.9 for ; Wed, 09 Jan 2019 03:50:50 -0800 (PST) Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com. [148.163.158.5]) by mx.google.com with ESMTPS id r30si4961465qtd.209.2019.01.09.03.50.49 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 09 Jan 2019 03:50:49 -0800 (PST) Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id x09BnWqO170039 for ; Wed, 9 Jan 2019 06:50:48 -0500 Received: from e06smtp02.uk.ibm.com (e06smtp02.uk.ibm.com [195.75.94.98]) by mx0b-001b2d01.pphosted.com with ESMTP id 2pwejsw0ax-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 09 Jan 2019 06:50:48 -0500 Received: from localhost by e06smtp02.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 9 Jan 2019 11:50:46 -0000 From: "Aneesh Kumar K.V" Subject: Re: [Bug 202149] New: NULL Pointer Dereference in __split_huge_pmd on PPC64LE In-Reply-To: References: <20190104170459.c8c7fa57ba9bc8a69dee5666@linux-foundation.org> <87ef9nk4cj.fsf@linux.ibm.com> Date: Wed, 09 Jan 2019 17:20:40 +0530 MIME-Version: 1.0 Content-Type: text/plain Message-Id: <8736q2jbhr.fsf@linux.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: Matt Corallo , Andrew Morton , linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org Cc: bugzilla-daemon@bugzilla.kernel.org Matt Corallo writes: > .config follows. I have not tested with 64K pages as, sadly, I have a > large BTRFS volume that was formatted on x86, and am thus stuck with 4K > pages. Note that this is roughly the Debian kernel, so it has whatever > patches Debian defaults to applying, a list of which follows. > What is the test you are running? I tried a 4K page size config on P9. I am running ltp test suite there. Also tried few thp memremap tests. Nothing hit that. root@:~/tests/ltp/testcases/kernel/mem/thp# getconf PAGESIZE 4096 root@ltc-boston123:~/tests/ltp/testcases/kernel/mem/thp# grep thp /proc/vmstat thp_fault_alloc 641141 thp_fault_fallback 0 thp_collapse_alloc 90 thp_collapse_alloc_failed 0 thp_file_alloc 0 thp_file_mapped 0 thp_split_page 1 thp_split_page_failed 0 thp_deferred_split_page 641150 thp_split_pmd 24 thp_zero_page_alloc 1 thp_zero_page_alloc_failed 0 thp_swpout 0 thp_swpout_fallback 0 root@:~/tests/ltp/testcases/kernel/mem/thp# -aneesh