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=-3.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 67BE0C28CF6 for ; Wed, 1 Aug 2018 20:04:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 266D3208A3 for ; Wed, 1 Aug 2018 20:04:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 266D3208A3 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387547AbeHAVvt (ORCPT ); Wed, 1 Aug 2018 17:51:49 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:48666 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729647AbeHAVvr (ORCPT ); Wed, 1 Aug 2018 17:51:47 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id DE2EDED1; Wed, 1 Aug 2018 13:04:21 -0700 (PDT) Received: from beelzebub.austin.arm.com (beelzebub.austin.arm.com [10.118.12.119]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 3B0143F5BA; Wed, 1 Aug 2018 13:04:21 -0700 (PDT) From: Jeremy Linton To: linux-mm@kvack.org Cc: cl@linux.com, penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, akpm@linux-foundation.org, mhocko@suse.com, vbabka@suse.cz, Punit.Agrawal@arm.com, Lorenzo.Pieralisi@arm.com, linux-arm-kernel@lists.infradead.org, bhelgaas@google.com, linux-kernel@vger.kernel.org, Jeremy Linton Subject: [RFC 1/2] slub: Avoid trying to allocate memory on offline nodes Date: Wed, 1 Aug 2018 15:04:17 -0500 Message-Id: <20180801200418.1325826-2-jeremy.linton@arm.com> X-Mailer: git-send-email 2.14.3 In-Reply-To: <20180801200418.1325826-1-jeremy.linton@arm.com> References: <20180801200418.1325826-1-jeremy.linton@arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If a user calls the *alloc_node() functions with an invalid node its possible to crash in alloc_pages_nodemask because NODE_DATA() returns a bad node, which propogates into the node zonelist in prepare_alloc_pages. This avoids that by not trying to allocate new slabs against offline nodes. (example backtrace) __alloc_pages_nodemask+0x128/0xf48 allocate_slab+0x94/0x528 new_slab+0x68/0xc8 ___slab_alloc+0x44c/0x520 __slab_alloc+0x50/0x68 kmem_cache_alloc_node_trace+0xe0/0x230 Signed-off-by: Jeremy Linton --- mm/slub.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/slub.c b/mm/slub.c index 51258eff4178..e03719bac1e2 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2519,6 +2519,8 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, if (unlikely(!node_match(page, searchnode))) { stat(s, ALLOC_NODE_MISMATCH); deactivate_slab(s, page, c->freelist, c); + if (!node_online(searchnode)) + node = NUMA_NO_NODE; goto new_slab; } } -- 2.14.3