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=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, T_DKIMWL_WL_HIGH,USER_AGENT_GIT 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 6B9E6C04AAB for ; Tue, 7 May 2019 05:49:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3D8BE205ED for ; Tue, 7 May 2019 05:49:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557208176; bh=1hD+jyiWd7YHvDqUeKWSIvwnCseUwW7B6jDDJB43U8Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=rwWs1HZ3hUR21dG3XQH0FoonKg+aZvN8vo137ylqMuzd/BSKwc5norEFglw1KxDz8 6B26pPtn+RgLzZp2slxhN3iFqmSfY+k0Ik3unpWgefLNYXbUnxqVsmRwmN4nIkS32m YvzwOjv6DCzLOcV+JQIfXvMIofTctG6g2hUZPVtI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728300AbfEGFtf (ORCPT ); Tue, 7 May 2019 01:49:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:59848 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729038AbfEGFkX (ORCPT ); Tue, 7 May 2019 01:40:23 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5AD8C20B7C; Tue, 7 May 2019 05:40:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557207623; bh=1hD+jyiWd7YHvDqUeKWSIvwnCseUwW7B6jDDJB43U8Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=s7CiKVYkNOfu0uro3pHOuAs8tpt44sSzVHUgoKe448X8peTRcelE8GT+H+ZnL5o1W M+Sk+iY+39rMcDcjj6LnhlKMH6OfXmVC/0whLWtEKQ4o/sDoO667l8XnGE84+pcVbs wLdEypiwpBc9yCWuxqaSJH+9ka/qjfRTzOxySVbw= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Mikhail Zaslonko , Gerald Schaefer , Michal Hocko , Michal Hocko , Mikhail Gavrilov , Dave Hansen , Alexander Duyck , Pasha Tatashin , Martin Schwidefsky , Heiko Carstens , Andrew Morton , Linus Torvalds , Sasha Levin , linux-mm@kvack.org Subject: [PATCH AUTOSEL 4.14 62/95] mm, memory_hotplug: initialize struct pages for the full memory section Date: Tue, 7 May 2019 01:37:51 -0400 Message-Id: <20190507053826.31622-62-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190507053826.31622-1-sashal@kernel.org> References: <20190507053826.31622-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Mikhail Zaslonko [ Upstream commit 2830bf6f05fb3e05bc4743274b806c821807a684 ] If memory end is not aligned with the sparse memory section boundary, the mapping of such a section is only partly initialized. This may lead to VM_BUG_ON due to uninitialized struct page access from is_mem_section_removable() or test_pages_in_a_zone() function triggered by memory_hotplug sysfs handlers: Here are the the panic examples: CONFIG_DEBUG_VM=y CONFIG_DEBUG_VM_PGFLAGS=y kernel parameter mem=2050M -------------------------- page:000003d082008000 is uninitialized and poisoned page dumped because: VM_BUG_ON_PAGE(PagePoisoned(p)) Call Trace: ( test_pages_in_a_zone+0xde/0x160) show_valid_zones+0x5c/0x190 dev_attr_show+0x34/0x70 sysfs_kf_seq_show+0xc8/0x148 seq_read+0x204/0x480 __vfs_read+0x32/0x178 vfs_read+0x82/0x138 ksys_read+0x5a/0xb0 system_call+0xdc/0x2d8 Last Breaking-Event-Address: test_pages_in_a_zone+0xde/0x160 Kernel panic - not syncing: Fatal exception: panic_on_oops kernel parameter mem=3075M -------------------------- page:000003d08300c000 is uninitialized and poisoned page dumped because: VM_BUG_ON_PAGE(PagePoisoned(p)) Call Trace: ( is_mem_section_removable+0xb4/0x190) show_mem_removable+0x9a/0xd8 dev_attr_show+0x34/0x70 sysfs_kf_seq_show+0xc8/0x148 seq_read+0x204/0x480 __vfs_read+0x32/0x178 vfs_read+0x82/0x138 ksys_read+0x5a/0xb0 system_call+0xdc/0x2d8 Last Breaking-Event-Address: is_mem_section_removable+0xb4/0x190 Kernel panic - not syncing: Fatal exception: panic_on_oops Fix the problem by initializing the last memory section of each zone in memmap_init_zone() till the very end, even if it goes beyond the zone end. Michal said: : This has alwways been problem AFAIU. It just went unnoticed because we : have zeroed memmaps during allocation before f7f99100d8d9 ("mm: stop : zeroing memory during allocation in vmemmap") and so the above test : would simply skip these ranges as belonging to zone 0 or provided a : garbage. : : So I guess we do care for post f7f99100d8d9 kernels mostly and : therefore Fixes: f7f99100d8d9 ("mm: stop zeroing memory during : allocation in vmemmap") Link: http://lkml.kernel.org/r/20181212172712.34019-2-zaslonko@linux.ibm.com Fixes: f7f99100d8d9 ("mm: stop zeroing memory during allocation in vmemmap") Signed-off-by: Mikhail Zaslonko Reviewed-by: Gerald Schaefer Suggested-by: Michal Hocko Acked-by: Michal Hocko Reported-by: Mikhail Gavrilov Tested-by: Mikhail Gavrilov Cc: Dave Hansen Cc: Alexander Duyck Cc: Pasha Tatashin Cc: Martin Schwidefsky Cc: Heiko Carstens Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- mm/page_alloc.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 923deb33bf34..16c20d9e771f 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5348,6 +5348,18 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone, __init_single_pfn(pfn, zone, nid); } } +#ifdef CONFIG_SPARSEMEM + /* + * If the zone does not span the rest of the section then + * we should at least initialize those pages. Otherwise we + * could blow up on a poisoned page in some paths which depend + * on full sections being initialized (e.g. memory hotplug). + */ + while (end_pfn % PAGES_PER_SECTION) { + __init_single_page(pfn_to_page(end_pfn), end_pfn, zone, nid); + end_pfn++; + } +#endif } static void __meminit zone_init_free_lists(struct zone *zone) -- 2.20.1