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=-6.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 3B367C2D0E7 for ; Wed, 1 Apr 2020 10:42:18 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id F00722078B for ; Wed, 1 Apr 2020 10:42:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="SMpvmJIu" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F00722078B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id A102D8E0007; Wed, 1 Apr 2020 06:42:17 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 973378E0001; Wed, 1 Apr 2020 06:42:17 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7CA6E8E0007; Wed, 1 Apr 2020 06:42:17 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0138.hostedemail.com [216.40.44.138]) by kanga.kvack.org (Postfix) with ESMTP id 5629F8E0001 for ; Wed, 1 Apr 2020 06:42:17 -0400 (EDT) Received: from smtpin12.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 186EA180AD815 for ; Wed, 1 Apr 2020 10:42:17 +0000 (UTC) X-FDA: 76658946714.12.cart37_6b2cc5133fd09 X-HE-Tag: cart37_6b2cc5133fd09 X-Filterd-Recvd-Size: 5207 Received: from us-smtp-delivery-1.mimecast.com (us-smtp-2.mimecast.com [207.211.31.81]) by imf32.hostedemail.com (Postfix) with ESMTP for ; Wed, 1 Apr 2020 10:42:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1585737735; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Kpk8Ci93jpDTnV7e6hR75YJUex/KNBqI974L9QpVbkU=; b=SMpvmJIu02gsfzhldbBMxR2hIdVvSgwjMFlp0m+asqeXkasM7fEtORWQkKwX8zbKDy06ut qYAC/BMoTg0QzMu5PwaFr0N6ZqM/jzTFfILB+yXjUWGr0XTvymsc1FwUg2QvDnTdUQdjVI Kct5K9elh8Ineh08x38QPzam4fdIX04= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-251-HNO-l5K-NauRnN8LzjEdGw-1; Wed, 01 Apr 2020 06:42:14 -0400 X-MC-Unique: HNO-l5K-NauRnN8LzjEdGw-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 6E911800D4E; Wed, 1 Apr 2020 10:42:12 +0000 (UTC) Received: from t480s.redhat.com (ovpn-114-59.ams2.redhat.com [10.36.114.59]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3033C100EBA6; Wed, 1 Apr 2020 10:42:09 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, David Hildenbrand , Andrew Morton , Kirill Tkhai , Shile Zhang , Pavel Tatashin , Daniel Jordan , Michal Hocko , Alexander Duyck , Baoquan He , Oscar Salvador Subject: [PATCH v1 2/2] mm/page_alloc: fix watchdog soft lockups during set_zone_contiguous() Date: Wed, 1 Apr 2020 12:41:56 +0200 Message-Id: <20200401104156.11564-3-david@redhat.com> In-Reply-To: <20200401104156.11564-1-david@redhat.com> References: <20200401104156.11564-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Content-Transfer-Encoding: quoted-printable 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: 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-20200= 331+ #4 [ 105.608933] Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4= 066+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 6= 3 f6 01 04 74 5e 48 c1 e7 06 4c 8b 05 cc 991 [ 105.608933] RSP: 0000:ffffb6d94000fe60 EFLAGS: 00010286 ORIG_RAX: ffff= ffffffffff13 [ 105.608933] RAX: fffff81953250000 RBX: 000000000a4c9600 RCX: ffff8fe9f= f7c1990 [ 105.608933] RDX: ffff8fe9ff7dab80 RSI: 000000000a4c95ff RDI: 000000029= 3250000 [ 105.608933] RBP: ffff8fe9ff7dab80 R08: fffff816c0000000 R09: 000000000= 0000008 [ 105.608933] R10: 0000000000000014 R11: 0000000000000014 R12: 000000000= 0000000 [ 105.608933] R13: 0000000000000000 R14: 0000000000000000 R15: 000000000= 0000000 [ 105.608933] FS: 0000000000000000(0000) GS:ffff8fe1ff400000(0000) knlG= S:0000000000000000 [ 105.608933] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 105.608933] CR2: 000000000f613000 CR3: 00000088cf20a000 CR4: 000000000= 00006f0 [ 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(); } =20 /* We confirm that there is no hole */ --=20 2.25.1