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Tue, 11 Feb 2020 04:29:50 +0000 From: Justin He To: Jeff Moyer CC: Catalin Marinas , Kirill A.Shutemov , "linux-mm@kvack.org" Subject: RE: bug: data corruption introduced by commit 83d116c53058 ("mm: fix double page fault on arm64 if PTE_AF is cleared") Thread-Topic: bug: data corruption introduced by commit 83d116c53058 ("mm: fix double page fault on arm64 if PTE_AF is cleared") Thread-Index: AQHV4GS1VLwrv+Kjo0eGYDc8c61fmKgVYlGQgAADz2A= Date: Tue, 11 Feb 2020 04:29:49 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US, zh-CN Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ts-tracking-id: e38fe1c6-7f09-4968-8b7f-055feed03873.1 x-checkrecipientchecked: true Authentication-Results-Original: spf=none (sender IP is ) smtp.mailfrom=Justin.He@arm.com; x-originating-ip: [113.29.88.7] x-ms-publictraffictype: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: e2529d14-b01b-4017-262b-08d7aeab0d05 X-MS-TrafficTypeDiagnostic: VE1PR08MB4831:|VE1PR08MB4831:|AM4PR0802MB2243: x-ms-exchange-transport-forked: True X-Microsoft-Antispam-PRVS: x-checkrecipientrouted: true nodisclaimer: true x-ms-oob-tlc-oobclassifiers: OLM:9508;OLM:10000; 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X-Microsoft-Antispam-Message-Info: 8/od+O/0peM8SimstD3k87cIOprrpemlfhbJriKofI816ZTXebH80y4AAPnnIuZg6ADc2QNQGQcceuDadnPTAvFYnaLW8Iu1q2ALEh44G2yY2+jYm1icfa5lnoWtcnRRPOQk8G6pzCaNxOwA4e0wnB72H9gIAyWjn42l2B0lNIEUuqNLI0t00xmofgH6gXAcDHoqzmtdu2y8cSNDkYgEU/A1pveh/TFFPjZ9HYR1qWNwJpsvecE0KCAry5skOIfKcDUTMSgNaaxRb+s0YVRI1SbSDO7L2kYA15l77jA2yl1qWx8zyksdNlZqCs8ws9lfnRo8BywA4k293p+hzlRm4grE0L7e/SFEKRuntuzQ9w/99TLfy2wzxNEMrWi2PAH2H2qaNO5GbQ5T78fcCPQ59XYHDTCeW88I4icV1kOnbnzMnOUcBvMPQYc+B0afh4KA X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Feb 2020 04:29:57.6786 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e2529d14-b01b-4017-262b-08d7aeab0d05 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM4PR0802MB2243 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: Hi Jeff > -----Original Message----- > From: Justin He > Sent: Tuesday, February 11, 2020 12:18 PM > To: Jeff Moyer > Cc: Catalin Marinas ; Kirill A.Shutemov > ; linux-mm@kvack.org > Subject: RE: bug: data corruption introduced by commit 83d116c53058 ("mm: > fix double page fault on arm64 if PTE_AF is cleared") > > Hi Jeff > > > -----Original Message----- > > From: Jeff Moyer > > Sent: Tuesday, February 11, 2020 6:52 AM > > To: Justin He > > Cc: Catalin Marinas ; Kirill A.Shutemov > > ; linux-mm@kvack.org > > Subject: bug: data corruption introduced by commit 83d116c53058 ("mm: f= ix > > double page fault on arm64 if PTE_AF is cleared") > > > > Hi, > > > > While running xfstests test generic/437, I noticed that the following > > WARN_ON_ONCE inside cow_user_page() was triggered: > > > > /* > > * This really shouldn't fail, because the page is there > > * in the page tables. But it might just be unreadable, > > * in which case we just give up and fill the result with > > * zeroes. > > */ > > if (__copy_from_user_inatomic(kaddr, uaddr, PAGE_SIZE)) { > > /* > > * Give a warn in case there can be some obscure > > * use-case > > */ > > WARN_ON_ONCE(1); > > clear_page(kaddr); > > } > > > > Just clearing the page, in this case, will result in data corruption. = I > > think the assumption that the copy fails because the memory is > > inaccessible may be wrong. In this instance, it may be the other threa= d > > issuing the madvise call? > > > > I reverted the commit in question, and the data corruption is gone. > > > > Thanks for the report. But this commit 83d116c53058 doesn't add the > new clear_page code path. Besides the pte_mkyoung part, It just refines > the codes(no functional change) and add a WARN_ON_ONCE to indicate > there is any obscure case before. I can't reproduce it with your provided test file on my arm64 qemu with a pmem device. Could you do me a favor that just revert 83d116c53058 but keep that WARN_ON_ONCE after clear_page()? Is there any difference? Thanks for your help -- Cheers, Justin (Jia He) > > -- > Cheers, > Justin (Jia He) > > > > Below is the (ppc64) stack trace (this will reproduce on x86 as well). > > I've attached the reproducer, which is a modified version of the > > xfs test. You'll need to setup a file system on pmem, and mount it wit= h > > -o dax. Then issue "./t_mmap_cow_race /mnt/pmem/foo". > > > > Any help tracking this down is appreciated. > > > > Thanks! > > Jeff > > > > [ 3690.894950] run fstests generic/437 at 2020-02-10 13:40:37 > > [ 3691.173277] ------------[ cut here ]------------ > > [ 3691.173302] WARNING: CPU: 76 PID: 51024 at mm/memory.c:2317 > > wp_page_copy+0xc40/0xd50 > > [ 3691.173308] Modules linked in: ext4 mbcache jbd2 loop rfkill ib_iser= t > > iscsi_target_mod ib_srpt target_core_mod ib_srp scsi_transport_srp i2c_= dev > > rpcrdma sunrpc rdma_ucm ib_iser ib_umad rdma_cm iw_cm libiscsi > > scsi_transport_iscsi ib_ipoib ib_cm mlx5_ib ib_uverbs ib_core > > dax_pmem_compat device_dax nd_pmem nd_btt dax_pmem_core > of_pmem > > libnvdimm ses enclosure ipmi_powernv ipmi_devintf sg ibmpowernv xts > > ipmi_msghandler opal_prd vmx_crypto leds_powernv powernv_op_panel > > uio_pdrv_genirq uio xfs libcrc32c sd_mod t10_pi mlx5_core ipr mpt3sas > libata > > raid_class tg3 scsi_transport_sas mlxfw dm_mirror dm_region_hash dm_log > > dm_mod [last unloaded: scsi_debug] > > [ 3691.173363] CPU: 76 PID: 51024 Comm: t_mmap_cow_race Not tainted > > 5.5.0+ #4 > > [ 3691.173369] NIP: c0000000003df6e0 LR: c0000000003df42c CTR: > > 0000000000007f10 > > [ 3691.173375] REGS: c000002ec66fb830 TRAP: 0700 Not tainted (5.5.0+= ) > > [ 3691.173379] MSR: 9000000002029033 CR= : > > 24022244 XER: 20040000 > > [ 3691.173388] CFAR: c0000000003df458 IRQMASK: 0 > > GPR00: 0000000000000000 c000002ec66fbac0 c000000001746a0= 0 > > 0000000000007f10 > > GPR04: 00007fff976080f0 0000000000007f10 00000000000080f= 0 > > 0000000000000000 > > GPR08: 0000000000000000 c000000000000000 c000002de046a00= 0 > > 0000000000000030 > > GPR12: 0000000000000040 c000002ffffa9800 0000000014a7027= 8 > > 00007fff981f0000 > > GPR16: 00007fff98f24410 00007fff98f24420 00007fff9760000= 0 > > 0000000014a70270 > > GPR20: 0000000010000fc0 c000002fa974ebf0 00007fff9760000= 0 > > c0000000017fd9e8 > > GPR24: c0000000017fd960 c000000001775e98 c000002eabcc5a0= 0 > > c000002fc3b40000 > > GPR28: 0000000000000000 c000002fa974ebf0 c00c00000bf0ed0= 0 > > c000002ec66fbc10 > > [ 3691.173430] NIP [c0000000003df6e0] wp_page_copy+0xc40/0xd50 > > [ 3691.173434] LR [c0000000003df42c] wp_page_copy+0x98c/0xd50 > > [ 3691.173438] Call Trace: > > [ 3691.173442] [c000002ec66fbac0] [c0000000003df42c] > > wp_page_copy+0x98c/0xd50 (unreliable) > > [ 3691.173448] [c000002ec66fbb80] [c0000000003e3448] > > do_wp_page+0xd8/0xad0 > > [ 3691.173454] [c000002ec66fbbd0] [c0000000003e6248] > > __handle_mm_fault+0x748/0x1b90 > > [ 3691.173460] [c000002ec66fbcd0] [c0000000003e77b0] > > handle_mm_fault+0x120/0x1f0 > > [ 3691.173466] [c000002ec66fbd10] [c000000000086b60] > > __do_page_fault+0x240/0xd70 > > [ 3691.173473] [c000002ec66fbde0] [c0000000000876c8] > > do_page_fault+0x38/0xd0 > > [ 3691.173480] [c000002ec66fbe20] [c00000000000a888] > > handle_page_fault+0x10/0x30 > > [ 3691.173484] Instruction dump: > > [ 3691.173488] 38800003 4bfffaf8 60000000 60000000 7f83e378 4800d585 > > 60000000 4bfffcb8 > > [ 3691.173496] 7f83e378 4bfa72b5 60000000 4bfffc8c <0fe00000> 3d42ffeb > > 394acb48 812a0008 > > [ 3691.173503] ---[ end trace a8dffbf7f73e8243 ]--- IMPORTANT NOTICE: The contents of this email and any attachments are confid= ential and may also be privileged. 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