From patchwork Tue Apr 12 15:11:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xu Yu X-Patchwork-Id: 12810872 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8CC4AC433F5 for ; Tue, 12 Apr 2022 15:11:20 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 1C0706B0071; Tue, 12 Apr 2022 11:11:20 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 16EF56B0073; Tue, 12 Apr 2022 11:11:20 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 039F86B0074; Tue, 12 Apr 2022 11:11:19 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0042.hostedemail.com [216.40.44.42]) by kanga.kvack.org (Postfix) with ESMTP id E882A6B0071 for ; Tue, 12 Apr 2022 11:11:19 -0400 (EDT) Received: from smtpin31.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 976F5AA094 for ; Tue, 12 Apr 2022 15:11:19 +0000 (UTC) X-FDA: 79348565478.31.8EFD77E Received: from out30-56.freemail.mail.aliyun.com (out30-56.freemail.mail.aliyun.com [115.124.30.56]) by imf16.hostedemail.com (Postfix) with ESMTP id B2DBF18000D for ; Tue, 12 Apr 2022 15:11:15 +0000 (UTC) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R171e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04395;MF=xuyu@linux.alibaba.com;NM=1;PH=DS;RN=5;SR=0;TI=SMTPD_---0V9vHTGC_1649776270; Received: from localhost(mailfrom:xuyu@linux.alibaba.com fp:SMTPD_---0V9vHTGC_1649776270) by smtp.aliyun-inc.com(127.0.0.1); Tue, 12 Apr 2022 23:11:11 +0800 From: Xu Yu To: linux-mm@kvack.org Cc: naoya.horiguchi@nec.com, akpm@linux-foundation.org, linmiaohe@huawei.com, osalvador@suse.de Subject: [PATCH v2] mm/memory-failure.c: skip huge_zero_page in memory_failure() Date: Tue, 12 Apr 2022 23:11:01 +0800 Message-Id: <497d3835612610e370c74e697ea3c721d1d55b9c.1649775850.git.xuyu@linux.alibaba.com> X-Mailer: git-send-email 2.20.1.2432.ga663e714 MIME-Version: 1.0 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: B2DBF18000D X-Stat-Signature: 5wpuwuk79ym9amx6sjb6a7i6hr5589zg X-Rspam-User: Authentication-Results: imf16.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=alibaba.com; spf=pass (imf16.hostedemail.com: domain of xuyu@linux.alibaba.com designates 115.124.30.56 as permitted sender) smtp.mailfrom=xuyu@linux.alibaba.com X-HE-Tag: 1649776275-614030 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: Kernel panic when injecting memory_failure for the global huge_zero_page, when CONFIG_DEBUG_VM is enabled, as follows. [ 5.582720] Injecting memory failure for pfn 0x109ff9 at process virtual address 0x20ff9000 [ 5.583786] page:00000000fb053fc3 refcount:2 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109e00 [ 5.584900] head:00000000fb053fc3 order:9 compound_mapcount:0 compound_pincount:0 [ 5.585796] flags: 0x17fffc000010001(locked|head|node=0|zone=2|lastcpupid=0x1ffff) [ 5.586712] raw: 017fffc000010001 0000000000000000 dead000000000122 0000000000000000 [ 5.587640] raw: 0000000000000000 0000000000000000 00000002ffffffff 0000000000000000 [ 5.588565] page dumped because: VM_BUG_ON_PAGE(is_huge_zero_page(head)) [ 5.589398] ------------[ cut here ]------------ [ 5.589952] kernel BUG at mm/huge_memory.c:2499! [ 5.590516] invalid opcode: 0000 [#1] PREEMPT SMP PTI [ 5.591120] CPU: 6 PID: 553 Comm: split_bug Not tainted 5.18.0-rc1+ #11 [ 5.591904] Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 3288b3c 04/01/2014 [ 5.592817] RIP: 0010:split_huge_page_to_list+0x66a/0x880 [ 5.593469] Code: 84 9b fb ff ff 48 8b 7c 24 08 31 f6 e8 9f 5d 2a 00 b8 b8 02 00 00 e9 e8 fb ff ff 48 c7 c6 e8 47 3c 82 4c b [ 5.595806] RSP: 0018:ffffc90000dcbdf8 EFLAGS: 00010246 [ 5.596434] RAX: 000000000000003c RBX: 0000000000000001 RCX: 0000000000000000 [ 5.597322] RDX: 0000000000000000 RSI: ffffffff823e4c4f RDI: 00000000ffffffff [ 5.598162] RBP: ffff88843fffdb40 R08: 0000000000000000 R09: 00000000fffeffff [ 5.598999] R10: ffffc90000dcbc48 R11: ffffffff82d68448 R12: ffffea0004278000 [ 5.599849] R13: ffffffff823c6203 R14: 0000000000109ff9 R15: ffffea000427fe40 [ 5.600693] FS: 00007fc375a26740(0000) GS:ffff88842fd80000(0000) knlGS:0000000000000000 [ 5.601640] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 5.602304] CR2: 00007fc3757c9290 CR3: 0000000102174006 CR4: 00000000003706e0 [ 5.603139] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 5.603977] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 5.604806] Call Trace: [ 5.605101] [ 5.605357] ? __irq_work_queue_local+0x39/0x70 [ 5.605904] try_to_split_thp_page+0x3a/0x130 [ 5.606430] memory_failure+0x128/0x800 [ 5.606888] madvise_inject_error.cold+0x8b/0xa1 [ 5.607444] __x64_sys_madvise+0x54/0x60 [ 5.607915] do_syscall_64+0x35/0x80 [ 5.608347] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 5.608949] RIP: 0033:0x7fc3754f8bf9 [ 5.609374] Code: 01 00 48 81 c4 80 00 00 00 e9 f1 fe ff ff 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 8 [ 5.611554] RSP: 002b:00007ffeda93a1d8 EFLAGS: 00000217 ORIG_RAX: 000000000000001c [ 5.612441] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc3754f8bf9 [ 5.613269] RDX: 0000000000000064 RSI: 0000000000003000 RDI: 0000000020ff9000 [ 5.614108] RBP: 00007ffeda93a200 R08: 0000000000000000 R09: 0000000000000000 [ 5.614946] R10: 00000000ffffffff R11: 0000000000000217 R12: 0000000000400490 [ 5.615787] R13: 00007ffeda93a2e0 R14: 0000000000000000 R15: 0000000000000000 [ 5.616626] This makes huge_zero_page bail out explicitly before split in memory_failure(), thus the panic above won't happen again. Reported-by: Abaci Suggested-by: Naoya Horiguchi Cc: Miaohe Lin Cc: Oscar Salvador Signed-off-by: Xu Yu Acked-by: Naoya Horiguchi Reviewed-by: Miaohe Lin --- mm/memory-failure.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index dcb6bb9cf731..8788ea49bd28 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1799,6 +1799,19 @@ int memory_failure(unsigned long pfn, int flags) } if (PageTransHuge(hpage)) { + /* + * Bail out before SetPageHasHWPoisoned() if hpage is + * huge_zero_page, although PG_has_hwpoisoned is not + * checked in set_huge_zero_page(). + * + * TODO: Handle memory failure of huge_zero_page thoroughly. + */ + if (is_huge_zero_page(hpage)) { + action_result(pfn, MF_MSG_UNSPLIT_THP, MF_IGNORED); + res = -EBUSY; + goto unlock_mutex; + } + /* * The flag must be set after the refcount is bumped * otherwise it may race with THP split.