From patchwork Wed Feb 19 19:50:49 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 231070 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=-3.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED autolearn=no 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 B1044C34056 for ; Wed, 19 Feb 2020 19:50:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 712992465D for ; Wed, 19 Feb 2020 19:50:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582141851; bh=/nKMx2b1v0PVXnvLf7DkKAWxLYqiPo1fkrKNAxkMrvs=; h=Date:From:To:Subject:List-ID:From; b=YXc94iGeM6QFSJ6ilWpMETtTpIaZtmoJicFHlOVkwp0qPlHfLvwG7adsbyqHcYMiH nJjF+BGiIIsbFTcAvA393keRvOwGMnk0y8dQS085fcM5S5/YNF4s1Fo3fwwnZRWR2e 11G3O8ucE0QVtAo/SawiPmJQmHvQfOLGY6lJtUwo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726791AbgBSTuu (ORCPT ); Wed, 19 Feb 2020 14:50:50 -0500 Received: from mail.kernel.org ([198.145.29.99]:55030 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726645AbgBSTuu (ORCPT ); Wed, 19 Feb 2020 14:50:50 -0500 Received: from X1 (nat-ab2241.sltdut.senawave.net [162.218.216.4]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 962B7207FD; Wed, 19 Feb 2020 19:50:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582141849; bh=/nKMx2b1v0PVXnvLf7DkKAWxLYqiPo1fkrKNAxkMrvs=; h=Date:From:To:Subject:From; b=M4xmiGBsPlL3SOLV90mNK7Z84+BebRnhVKu3LoUNBaMHVT0haZgpDnucW3YkWdvJy BfcLi5Hi9Hit8I9qT+vZScPLdS65oMc8SzJ6U2GYnZbd/AWFUMNEQVxK6V78spvFmO UzW73FtexDWK9xJg7ydcXehwdn40Td0U3XcIU4vg= Date: Wed, 19 Feb 2020 11:50:49 -0800 From: akpm@linux-foundation.org To: mm-commits@vger.kernel.org, stable@vger.kernel.org, rppt@linux.ibm.com, osalvador@suse.de, mhocko@suse.com, david@redhat.com, dan.j.williams@intel.com, bhe@redhat.com, richardw.yang@linux.intel.com Subject: + mm-sparsemem-pfn_to_page-is-not-valid-yet-on-sparsemem.patch added to -mm tree Message-ID: <20200219195049.K7dGY%akpm@linux-foundation.org> User-Agent: s-nail v14.9.10 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch titled Subject: mm/sparsemem: pfn_to_page is not valid yet on SPARSEMEM has been added to the -mm tree. Its filename is mm-sparsemem-pfn_to_page-is-not-valid-yet-on-sparsemem.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/mm-sparsemem-pfn_to_page-is-not-valid-yet-on-sparsemem.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/mm-sparsemem-pfn_to_page-is-not-valid-yet-on-sparsemem.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Wei Yang Subject: mm/sparsemem: pfn_to_page is not valid yet on SPARSEMEM When we use SPARSEMEM instead of SPARSEMEM_VMEMMAP, pfn_to_page() doesn't work before sparse_init_one_section() is called. This leads to a crash when hotplug memory: [ 41.839170] BUG: unable to handle page fault for address: 0000000006400000 [ 41.840663] #PF: supervisor write access in kernel mode [ 41.841822] #PF: error_code(0x0002) - not-present page [ 41.842970] PGD 0 P4D 0 [ 41.843538] Oops: 0002 [#1] SMP PTI [ 41.844125] CPU: 3 PID: 221 Comm: kworker/u16:1 Tainted: G W 5.5.0-next-20200205+ #343 [ 41.845659] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015 [ 41.846977] Workqueue: kacpi_hotplug acpi_hotplug_work_fn [ 41.847904] RIP: 0010:__memset+0x24/0x30 [ 41.848660] Code: cc cc cc cc cc cc 0f 1f 44 00 00 49 89 f9 48 89 d1 83 e2 07 48 c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3 [ 41.851836] RSP: 0018:ffffb43ac0373c80 EFLAGS: 00010a87 [ 41.852686] RAX: ffffffffffffffff RBX: ffff8a1518800000 RCX: 0000000000050000 [ 41.853824] RDX: 0000000000000000 RSI: 00000000000000ff RDI: 0000000006400000 [ 41.854967] RBP: 0000000000140000 R08: 0000000000100000 R09: 0000000006400000 [ 41.856107] R10: 0000000000000000 R11: 0000000000000002 R12: 0000000000000000 [ 41.857255] R13: 0000000000000028 R14: 0000000000000000 R15: ffff8a153ffd9280 [ 41.858414] FS: 0000000000000000(0000) GS:ffff8a153ab00000(0000) knlGS:0000000000000000 [ 41.859703] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.860627] CR2: 0000000006400000 CR3: 0000000136fca000 CR4: 00000000000006e0 [ 41.861716] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 41.862680] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.863628] Call Trace: [ 41.863983] sparse_add_section+0x1c9/0x26a [ 41.864570] __add_pages+0xbf/0x150 [ 41.865057] add_pages+0x12/0x60 [ 41.865489] add_memory_resource+0xc8/0x210 [ 41.866017] ? wake_up_q+0xa0/0xa0 [ 41.866416] __add_memory+0x62/0xb0 [ 41.866825] acpi_memory_device_add+0x13f/0x300 [ 41.867410] acpi_bus_attach+0xf6/0x200 [ 41.867890] acpi_bus_scan+0x43/0x90 [ 41.868448] acpi_device_hotplug+0x275/0x3d0 [ 41.868972] acpi_hotplug_work_fn+0x1a/0x30 [ 41.869473] process_one_work+0x1a7/0x370 [ 41.869953] worker_thread+0x30/0x380 [ 41.870396] ? flush_rcu_work+0x30/0x30 [ 41.870846] kthread+0x112/0x130 [ 41.871236] ? kthread_create_on_node+0x60/0x60 [ 41.871770] ret_from_fork+0x35/0x40 We should use memmap as it did. On x86 the impact is limited to x86_32 builds, or x86_64 configurations that override the default setting for SPARSEMEM_VMEMMAP. [dan.j.williams@intel.com: changelog update] Link: http://lkml.kernel.org/r/20200219030454.4844-1-bhe@redhat.com Fixes: ba72b4c8cf60 ("mm/sparsemem: support sub-section hotplug") Signed-off-by: Wei Yang Signed-off-by: Baoquan He Acked-by: David Hildenbrand Reviewed-by: Baoquan He Reviewed-by: Dan Williams Cc: Mike Rapoport Cc: Oscar Salvador Cc: Michal Hocko Cc: Signed-off-by: Andrew Morton --- mm/sparse.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/sparse.c~mm-sparsemem-pfn_to_page-is-not-valid-yet-on-sparsemem +++ a/mm/sparse.c @@ -876,7 +876,7 @@ int __meminit sparse_add_section(int nid * Poison uninitialized struct pages in order to catch invalid flags * combinations. */ - page_init_poison(pfn_to_page(start_pfn), sizeof(struct page) * nr_pages); + page_init_poison(memmap, sizeof(struct page) * nr_pages); ms = __nr_to_section(section_nr); set_section_nid(section_nr, nid);