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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, 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 C0E71C35669 for ; Sat, 22 Feb 2020 03:34:46 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3EF0D206DB for ; Sat, 22 Feb 2020 03:34:45 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3EF0D206DB Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 6C59A6B0003; Fri, 21 Feb 2020 22:34:45 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 6756D6B0006; Fri, 21 Feb 2020 22:34:45 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 563CE6B0007; Fri, 21 Feb 2020 22:34:45 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0137.hostedemail.com [216.40.44.137]) by kanga.kvack.org (Postfix) with ESMTP id 3C84B6B0003 for ; Fri, 21 Feb 2020 22:34:45 -0500 (EST) Received: from smtpin26.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id E101C180AD811 for ; Sat, 22 Feb 2020 03:34:44 +0000 (UTC) X-FDA: 76516346088.26.flock01_45eb13b00d255 X-HE-Tag: flock01_45eb13b00d255 X-Filterd-Recvd-Size: 6553 Received: from huawei.com (szxga05-in.huawei.com [45.249.212.191]) by imf48.hostedemail.com (Postfix) with ESMTP for ; Sat, 22 Feb 2020 03:34:40 +0000 (UTC) Received: from DGGEMS407-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id DF35AB523A292F0A1675; Sat, 22 Feb 2020 11:34:30 +0800 (CST) Received: from localhost (10.177.246.209) by DGGEMS407-HUB.china.huawei.com (10.3.19.207) with Microsoft SMTP Server id 14.3.439.0; Sat, 22 Feb 2020 11:34:24 +0800 From: "Longpeng(Mike)" To: , CC: , , , , , , , Longpeng , Matthew Wilcox , "Sean Christopherson" , Subject: [PATCH v2] mm/hugetlb: fix a addressing exception caused by huge_pte_offset() Date: Sat, 22 Feb 2020 11:33:47 +0800 Message-ID: <1582342427-230392-1-git-send-email-longpeng2@huawei.com> X-Mailer: git-send-email 1.8.4.msysgit.0 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.177.246.209] X-CFilter-Loop: Reflected 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: From: Longpeng Our machine encountered a panic(addressing exception) after run for a long time and the calltrace is: RIP: 0010:[] [] hugetlb_fault+0x307/0xbe0 RSP: 0018:ffff9567fc27f808 EFLAGS: 00010286 RAX: e800c03ff1258d48 RBX: ffffd3bb003b69c0 RCX: e800c03ff1258d48 RDX: 17ff3fc00eda72b7 RSI: 00003ffffffff000 RDI: e800c03ff1258d48 RBP: ffff9567fc27f8c8 R08: e800c03ff1258d48 R09: 0000000000000080 R10: ffffaba0704c22a8 R11: 0000000000000001 R12: ffff95c87b4b60d8 R13: 00005fff00000000 R14: 0000000000000000 R15: ffff9567face8074 FS: 00007fe2d9ffb700(0000) GS:ffff956900e40000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffd3bb003b69c0 CR3: 000000be67374000 CR4: 00000000003627e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: [] ? unlock_page+0x2b/0x30 [] ? hugetlb_fault+0x222/0xbe0 [] follow_hugetlb_page+0x175/0x540 [] ? cpumask_next_and+0x35/0x50 [] __get_user_pages+0x2a0/0x7e0 [] __get_user_pages_unlocked+0x15d/0x210 [] __gfn_to_pfn_memslot+0x3c5/0x460 [kvm] [] try_async_pf+0x6e/0x2a0 [kvm] [] tdp_page_fault+0x151/0x2d0 [kvm] [] ? vmx_vcpu_run+0x2ec/0xc80 [kvm_intel] [] ? vmx_vcpu_run+0x2f8/0xc80 [kvm_intel] [] kvm_mmu_page_fault+0x31/0x140 [kvm] [] handle_ept_violation+0x9e/0x170 [kvm_intel] [] vmx_handle_exit+0x2bc/0xc70 [kvm_intel] [] ? __vmx_complete_interrupts.part.73+0x80/0xd0 [kvm_intel] [] ? vmx_vcpu_run+0x490/0xc80 [kvm_intel] [] vcpu_enter_guest+0x7be/0x13a0 [kvm] [] ? kvm_check_async_pf_completion+0x8e/0xb0 [kvm] [] kvm_arch_vcpu_ioctl_run+0x330/0x490 [kvm] [] kvm_vcpu_ioctl+0x309/0x6d0 [kvm] [] ? dequeue_signal+0x32/0x180 [] ? do_sigtimedwait+0xcd/0x230 [] do_vfs_ioctl+0x3f0/0x540 [] SyS_ioctl+0xa1/0xc0 [] system_call_fastpath+0x22/0x27 ( The kernel we used is older, but we think the latest kernel also has this bug after dig into this problem. ) For 1G hugepages, huge_pte_offset() wants to return NULL or pudp, but it may return a wrong 'pmdp' if there is a race. Please look at the following code snippet: ... pud = pud_offset(p4d, addr); if (sz != PUD_SIZE && pud_none(*pud)) return NULL; /* hugepage or swap? */ if (pud_huge(*pud) || !pud_present(*pud)) return (pte_t *)pud; pmd = pmd_offset(pud, addr); if (sz != PMD_SIZE && pmd_none(*pmd)) return NULL; /* hugepage or swap? */ if (pmd_huge(*pmd) || !pmd_present(*pmd)) return (pte_t *)pmd; ... The following sequence would trigger this bug: 1. CPU0: sz = PUD_SIZE and *pud = 0 , continue 1. CPU0: "pud_huge(*pud)" is false 2. CPU1: calling hugetlb_no_page and set *pud to xxxx8e7(PRESENT) 3. CPU0: "!pud_present(*pud)" is false, continue 4. CPU0: pmd = pmd_offset(pud, addr) and maybe return a wrong pmdp However, we want CPU0 to return NULL or pudp. We can avoid this race by read the pud only once. What's more, we also use READ_ONCE to access the entries for safe(e.g. avoid the compilier mischief) Cc: Matthew Wilcox Cc: Sean Christopherson Cc: Mike Kravetz Cc: stable@vger.kernel.org Signed-off-by: Longpeng --- v1 -> v2: - avoid renaming [Matthew, Mike] --- mm/hugetlb.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index dd8737a..90daf37 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -4910,28 +4910,30 @@ pte_t *huge_pte_offset(struct mm_struct *mm, { pgd_t *pgd; p4d_t *p4d; - pud_t *pud; - pmd_t *pmd; + pud_t *pud, pud_entry; + pmd_t *pmd, pmd_entry; pgd = pgd_offset(mm, addr); - if (!pgd_present(*pgd)) + if (!pgd_present(READ_ONCE(*pgd))) return NULL; p4d = p4d_offset(pgd, addr); - if (!p4d_present(*p4d)) + if (!p4d_present(READ_ONCE(*p4d))) return NULL; pud = pud_offset(p4d, addr); - if (sz != PUD_SIZE && pud_none(*pud)) + pud_entry = READ_ONCE(*pud); + if (sz != PUD_SIZE && pud_none(pud_entry)) return NULL; /* hugepage or swap? */ - if (pud_huge(*pud) || !pud_present(*pud)) + if (pud_huge(pud_entry) || !pud_present(pud_entry)) return (pte_t *)pud; pmd = pmd_offset(pud, addr); - if (sz != PMD_SIZE && pmd_none(*pmd)) + pmd_entry = READ_ONCE(*pmd); + if (sz != PMD_SIZE && pmd_none(pmd_entry)) return NULL; /* hugepage or swap? */ - if (pmd_huge(*pmd) || !pmd_present(*pmd)) + if (pmd_huge(pmd_entry) || !pmd_present(pmd_entry)) return (pte_t *)pmd; return NULL; -- 1.8.3.1