From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CA442C43331 for ; Wed, 1 Apr 2020 14:04:54 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 935EA206F8 for ; Wed, 1 Apr 2020 14:04:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 935EA206F8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 2BE598E0005; Wed, 1 Apr 2020 10:04:54 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 26E2C8E0001; Wed, 1 Apr 2020 10:04:54 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 15D858E0005; Wed, 1 Apr 2020 10:04:54 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0144.hostedemail.com [216.40.44.144]) by kanga.kvack.org (Postfix) with ESMTP id EEC438E0001 for ; Wed, 1 Apr 2020 10:04:53 -0400 (EDT) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id AB6F6180AD804 for ; Wed, 1 Apr 2020 14:04:53 +0000 (UTC) X-FDA: 76659457266.05.uncle62_81f4724277049 X-HE-Tag: uncle62_81f4724277049 X-Filterd-Recvd-Size: 4648 Received: from out4436.biz.mail.alibaba.com (out4436.biz.mail.alibaba.com [47.88.44.36]) by imf50.hostedemail.com (Postfix) with ESMTP for ; Wed, 1 Apr 2020 14:04:52 +0000 (UTC) X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R801e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04394;MF=shile.zhang@linux.alibaba.com;NM=1;PH=DS;RN=11;SR=0;TI=SMTPD_---0TuK-7Fh_1585749544; Received: from ali-6c96cfdd1403.local(mailfrom:shile.zhang@linux.alibaba.com fp:SMTPD_---0TuK-7Fh_1585749544) by smtp.aliyun-inc.com(127.0.0.1); Wed, 01 Apr 2020 21:59:04 +0800 Subject: Re: [PATCH v1 2/2] mm/page_alloc: fix watchdog soft lockups during set_zone_contiguous() To: David Hildenbrand , linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, Andrew Morton , Kirill Tkhai , Pavel Tatashin , Daniel Jordan , Michal Hocko , Alexander Duyck , Baoquan He , Oscar Salvador References: <20200401104156.11564-1-david@redhat.com> <20200401104156.11564-3-david@redhat.com> From: Shile Zhang Message-ID: <2b2408eb-9695-08af-3e6f-a4c88ee505fc@linux.alibaba.com> Date: Wed, 1 Apr 2020 21:59:04 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200401104156.11564-3-david@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 2020/4/1 18:41, David Hildenbrand wrote: > Without CONFIG_PREEMPT, it can happen that we get soft lockups detected, > e.g., while booting up. > > [ 105.608900] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [swapper/0:1] > [ 105.608933] Modules linked in: > [ 105.608933] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.6.0-next-20200331+ #4 > [ 105.608933] Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014 > [ 105.608933] RIP: 0010:__pageblock_pfn_to_page+0x134/0x1c0 > [ 105.608933] Code: 85 c0 74 71 4a 8b 04 d0 48 85 c0 74 68 48 01 c1 74 63 f6 01 04 74 5e 48 c1 e7 06 4c 8b 05 cc 991 > [ 105.608933] RSP: 0000:ffffb6d94000fe60 EFLAGS: 00010286 ORIG_RAX: ffffffffffffff13 > [ 105.608933] RAX: fffff81953250000 RBX: 000000000a4c9600 RCX: ffff8fe9ff7c1990 > [ 105.608933] RDX: ffff8fe9ff7dab80 RSI: 000000000a4c95ff RDI: 0000000293250000 > [ 105.608933] RBP: ffff8fe9ff7dab80 R08: fffff816c0000000 R09: 0000000000000008 > [ 105.608933] R10: 0000000000000014 R11: 0000000000000014 R12: 0000000000000000 > [ 105.608933] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 > [ 105.608933] FS: 0000000000000000(0000) GS:ffff8fe1ff400000(0000) knlGS:0000000000000000 > [ 105.608933] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 105.608933] CR2: 000000000f613000 CR3: 00000088cf20a000 CR4: 00000000000006f0 > [ 105.608933] Call Trace: > [ 105.608933] set_zone_contiguous+0x56/0x70 > [ 105.608933] page_alloc_init_late+0x166/0x176 > [ 105.608933] kernel_init_freeable+0xfa/0x255 > [ 105.608933] ? rest_init+0xaa/0xaa > [ 105.608933] kernel_init+0xa/0x106 > [ 105.608933] ret_from_fork+0x35/0x40 > > The issue becomes visible when having a lot of memory (e.g., 4TB) > assigned to a single NUMA node - a system that can easily be created > using QEMU. Inside VMs on a hypervisor with quite some memory > overcommit, this is fairly easy to trigger. > > Cc: Andrew Morton > Cc: Kirill Tkhai > Cc: Shile Zhang > Cc: Pavel Tatashin > Cc: Daniel Jordan > Cc: Michal Hocko > Cc: Alexander Duyck > Cc: Baoquan He > Cc: Oscar Salvador > Signed-off-by: David Hildenbrand > --- > mm/page_alloc.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 084cabffc90d..cc4f07d52939 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -1607,6 +1607,7 @@ void set_zone_contiguous(struct zone *zone) > if (!__pageblock_pfn_to_page(block_start_pfn, > block_end_pfn, zone)) > return; > + cond_resched(); > } > > /* We confirm that there is no hole */ Reviewed-by: Shile Zhang