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Mon, 15 Aug 2022 15:46:46 +0000 Received: from [172.27.11.227] (10.126.230.35) by rnnvmail201.nvidia.com (10.129.68.8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.29; Mon, 15 Aug 2022 08:46:43 -0700 Message-ID: <0e8a0d16-3c6f-a649-44b3-ab960801d90f@nvidia.com> Date: Mon, 15 Aug 2022 18:46:40 +0300 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.12.0 Subject: Re: Bug report: vfio over kernel 5.19 - mm area Content-Language: en-US To: Alex Williamson , CC: , jason Gunthorpe , "maor Gottlieb" , "kvm@vger.kernel.org" , , References: <3391f2e5-149a-7825-f89e-8bde3c6d555d@nvidia.com> <20220615080228.7a5e7552.alex.williamson@redhat.com> From: Yishai Hadas In-Reply-To: <20220615080228.7a5e7552.alex.williamson@redhat.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-Originating-IP: [10.126.230.35] X-ClientProxiedBy: rnnvmail202.nvidia.com (10.129.68.7) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: fd17533c-3a3b-49c0-1e86-08da7ed55c7c X-MS-TrafficTypeDiagnostic: MWHPR12MB1600:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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spf=pass (imf08.hostedemail.com: domain of yishaih@nvidia.com designates 40.107.94.63 as permitted sender) smtp.mailfrom=yishaih@nvidia.com; dmarc=pass (policy=reject) header.from=nvidia.com; arc=pass ("microsoft.com:s=arcselector9901:i=1") X-Stat-Signature: 3um3soamez131exc7a6yzxuf6e6urz1d X-HE-Tag: 1660578410-190701 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: On 15/06/2022 17:02, Alex Williamson wrote: > On Wed, 15 Jun 2022 13:52:10 +0300 > Yishai Hadas wrote: > >> Adding some extra relevant people from the MM area. >> >> On 15/06/2022 13:43, Yishai Hadas wrote: >>> Hi All, >>> >>> Any idea what could cause the below break in 5.19 ? we run QEMU and >>> immediately the machine is stuck. >>> >>> Once I run, echo l > /proc/sysrq-trigger could see the below task >>> which seems to be stuck.. >>> >>> This basic flow worked fine in 5.18. > Spent Friday bisecting this and posted this fix: > > https://lore.kernel.org/all/165490039431.944052.12458624139225785964.stgit@omen/ > > I expect you're hotting the same. Thanks, > > Alex Alex, It seems that we got the same bug again in V6.0 RC1 .. The below code [1] from commit [2], put back the 'is_zero_pfn()' under the !(..) and seems buggy. I would expect the below fix for that [3]. Alex Sierra, Can you please review the below suggested fix for your patch and send a patch for RC2 accordingly ? Yishai [1] See: https://elixir.bootlin.com/linux/v6.0-rc1/source/include/linux/mm.h#L1549 diff --git a/include/linux/mm.h b/include/linux/mm.h index a2d01e49253b..64393ed3330a 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -28,6 +28,7 @@  #include  #include  #include +#include  struct mempolicy;  struct anon_vma; @@ -1537,7 +1538,9 @@ static inline bool is_longterm_pinnable_page(struct page *page)         if (mt == MIGRATE_CMA || mt == MIGRATE_ISOLATE)                 return false;  #endif -       return !is_zone_movable_page(page) || is_zero_pfn(page_to_pfn(page)); +       return !(is_device_coherent_page(page) || +                is_zone_movable_page(page) || +                is_zero_pfn(page_to_pfn(page)));  } [2] f25cbb7a95a24ff9a2a3bebd308e303942ae6b2c Author: Alex Sierra Date:   Fri Jul 15 10:05:10 2022 -0500     mm: add zone device coherent type memory support [3] Expected fix diff --git a/include/linux/mm.h b/include/linux/mm.h index 3bedc449c14d..b25f9886bd4c 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1544,9 +1544,9 @@ static inline bool is_longterm_pinnable_page(struct page *page)         if (mt == MIGRATE_CMA || mt == MIGRATE_ISOLATE)                 return false;  #endif -       return !(is_device_coherent_page(page) || -                is_zone_movable_page(page) || -                is_zero_pfn(page_to_pfn(page))); +       return !is_device_coherent_page(page) || +              !is_zone_movable_page(page) || +              is_zero_pfn(page_to_pfn(page));  }  #else  static inline bool is_longterm_pinnable_page(struct page *page) >>> [1162.056583] NMI backtrace for cpu 4 >>> [ 1162.056585] CPU: 4 PID: 1979 Comm: qemu-system-x86 Not tainted >>> 5.19.0-rc1 #747 >>> [ 1162.056587] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), >>> BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 >>> [ 1162.056588] RIP: 0010:pmd_huge+0x0/0x20 >>> [ 1162.056592] Code: 49 89 44 24 28 48 8b 47 30 49 89 44 24 30 31 c0 >>> 41 5c c3 5b b8 01 00 00 00 5d 41 5c c3 cc cc cc cc cc cc cc cc cc cc >>> cc cc cc <0f> 1f 44 00 00 31 c0 48 f7 c7 9f ff ff ff 74 0f 81 e7 81 00 >>> 00 00 >>> [ 1162.056594] RSP: 0018:ffff888146253b38 EFLAGS: 00000202 >>> [ 1162.056596] RAX: ffff888101461980 RBX: ffff888146253bc0 RCX: >>> 000ffffffffff000 >>> [ 1162.056597] RDX: ffff88814fa22000 RSI: 00007f9f68231000 RDI: >>> 000000010a6b6067 >>> [ 1162.056598] RBP: ffff888111b90dc0 R08: 000000000002f424 R09: >>> 0000000000000001 >>> [ 1162.056599] R10: ffffffff825c2a40 R11: 0000000000000a08 R12: >>> ffff88814fa22a08 >>> [ 1162.056600] R13: 000000010a6b6067 R14: 0000000000052202 R15: >>> 00007f9f68231000 >>> [ 1162.056602] FS:  00007f9f6c228c40(0000) GS:ffff88885f900000(0000) >>> knlGS:0000000000000000 >>> [ 1162.056605] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >>> [ 1162.056606] CR2: 00005643994fd0ed CR3: 00000001496da005 CR4: >>> 0000000000372ea0 >>> [ 1162.056607] DR0: 0000000000000000 DR1: 0000000000000000 DR2: >>> 0000000000000000 >>> [ 1162.056609] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: >>> 0000000000000400 >>> [ 1162.056610] Call Trace: >>> [ 1162.056611]  >>> [ 1162.056611]  follow_page_mask+0x196/0x5e0 >>> [ 1162.056615]  __get_user_pages+0x190/0x5d0 >>> [ 1162.056617]  ? flush_workqueue_prep_pwqs+0x110/0x110 >>> [ 1162.056620]  __gup_longterm_locked+0xaf/0x470 >>> [ 1162.056624]  vaddr_get_pfns+0x8e/0x240 [vfio_iommu_type1] >>> [ 1162.056628]  ? qi_flush_iotlb+0x83/0xa0 >>> [ 1162.056631]  vfio_pin_pages_remote+0x326/0x460 [vfio_iommu_type1] >>> [ 1162.056634]  vfio_iommu_type1_ioctl+0x421/0x14f0 [vfio_iommu_type1] >>> [ 1162.056638]  __x64_sys_ioctl+0x3e4/0x8e0 >>> [ 1162.056641]  do_syscall_64+0x3d/0x90 >>> [ 1162.056644]  entry_SYSCALL_64_after_hwframe+0x46/0xb0 >>> [ 1162.056646] RIP: 0033:0x7f9f6d14317b >>> [ 1162.056648] Code: 0f 1e fa 48 8b 05 1d ad 0c 00 64 c7 00 26 00 00 >>> 00 48 c7 c0 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa b8 10 00 00 >>> 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d ed ac 0c 00 f7 d8 64 89 >>> 01 48 >>> [ 1162.056650] RSP: 002b:00007fff4fca15b8 EFLAGS: 00000246 ORIG_RAX: >>> 0000000000000010 >>> [ 1162.056652] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: >>> 00007f9f6d14317b >>> [ 1162.056653] RDX: 00007fff4fca1620 RSI: 0000000000003b71 RDI: >>> 000000000000001c >>> [ 1162.056654] RBP: 00007fff4fca1650 R08: 0000000000000001 R09: >>> 0000000000000000 >>> [ 1162.056655] R10: 0000000100000000 R11: 0000000000000246 R12: >>> 0000000000000000 >>> [ 1162.056656] R13: 0000000000000000 R14: 0000000000000000 R15: >>> 0000000000000000 >>> [ 1162.056657]  >>> >>> Yishai >>>