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client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by MWH0EPF000A6730.mail.protection.outlook.com (10.167.249.22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8655.12 via Frontend Transport; Thu, 17 Apr 2025 11:52:17 +0000 Received: from BLR-L1-SARUNKOD.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Thu, 17 Apr 2025 06:52:13 -0500 From: Sairaj Kodilkar To: , , CC: , , , , , , , , Subject: [bug report] Potential DEADLOCK due to vfio_pci_mmap_huge_fault() Date: Thu, 17 Apr 2025 17:22:00 +0530 Message-ID: <20250417115200.31275-1-sarunkod@amd.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MWH0EPF000A6730:EE_|SN7PR12MB7452:EE_ X-MS-Office365-Filtering-Correlation-Id: 60f32a41-3a95-41c8-e7c0-08dd7da64d71 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|36860700013|376014; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Apr 2025 11:52:17.2269 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 60f32a41-3a95-41c8-e7c0-08dd7da64d71 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: MWH0EPF000A6730.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB7452 Hi everyone, I am seeing following errors on the host when I run FIO tests inside the guest on the latest upstream kernel. This causes guest to hang. Can anyone help with this ? I have done some cursory analysis of the trace and it seems the reason is `vfio_pci_mmap_huge_fault`. I think following scenario is causing the deadlock. CPU0 CPU1 CPU2 (Trying do (Trying to perform (Receives fault `vfio_pci_set_msi_trigger()) operation with sysfs during vfio_pin_pages_remote()) /sys/bus/pci/devices/) =================================================================================================== (A) vdev->memory_lock (vfio_msi_enable()) (C) root->kernfs_rwsem (kernfs_fop_readdir()) (B) root->kernfs_rwsem (kernfs_add_one()) (E) mm->mmap_lock (do_user_addr_fault()) (D) mm->mmap_lock (do_user_addr_fault()) (F) vdev->memory_lock (vfio_pci_mmap_huge_fault()) Here, there is circular dependency of A->B->C->D->E->F->A. Please let me know if anyone encountered this. I will be happy to help! --------------------------------------------------------------------------------- [ 1457.982233] ====================================================== [ 1457.989494] WARNING: possible circular locking dependency detected [ 1457.996764] 6.15.0-rc1-0af2f6be1b42-1744803490343 #1 Not tainted [ 1458.003842] ------------------------------------------------------ [ 1458.011105] CPU 0/KVM/8259 is trying to acquire lock: [ 1458.017107] ff27171d80a8e960 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_add_one+0x34/0x380 [ 1458.027027] [ 1458.027027] but task is already holding lock: [ 1458.034273] ff27171e19663918 (&vdev->memory_lock){++++}-{4:4}, at: vfio_pci_memory_lock_and_enable+0x2c/0x90 [vfio_pci_core] [ 1458.047221] [ 1458.047221] which lock already depends on the new lock. [ 1458.047221] [ 1458.057506] [ 1458.057506] the existing dependency chain (in reverse order) is: [ 1458.066629] [ 1458.066629] -> #2 (&vdev->memory_lock){++++}-{4:4}: [ 1458.074509] __lock_acquire+0x52e/0xbe0 [ 1458.079778] lock_acquire+0xc7/0x2e0 [ 1458.084764] down_read+0x35/0x270 [ 1458.089437] vfio_pci_mmap_huge_fault+0xac/0x1c0 [vfio_pci_core] [ 1458.097135] __do_fault+0x30/0x180 [ 1458.101918] do_shared_fault+0x2d/0x1b0 [ 1458.107189] do_fault+0x41/0x390 [ 1458.111779] __handle_mm_fault+0x2f6/0x730 [ 1458.117339] handle_mm_fault+0xd8/0x2a0 [ 1458.122606] fixup_user_fault+0x7f/0x1d0 [ 1458.127963] vaddr_get_pfns+0x129/0x2b0 [vfio_iommu_type1] [ 1458.135073] vfio_pin_pages_remote+0xd4/0x430 [vfio_iommu_type1] [ 1458.142771] vfio_pin_map_dma+0xd4/0x350 [vfio_iommu_type1] [ 1458.149979] vfio_dma_do_map+0x2dd/0x450 [vfio_iommu_type1] [ 1458.157183] vfio_iommu_type1_ioctl+0x126/0x1c0 [vfio_iommu_type1] [ 1458.165076] __x64_sys_ioctl+0x94/0xc0 [ 1458.170250] do_syscall_64+0x72/0x180 [ 1458.175320] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 1458.181944] [ 1458.181944] -> #1 (&mm->mmap_lock){++++}-{4:4}: [ 1458.189446] __lock_acquire+0x52e/0xbe0 [ 1458.194703] lock_acquire+0xc7/0x2e0 [ 1458.199676] down_read_killable+0x35/0x280 [ 1458.205229] lock_mm_and_find_vma+0x96/0x280 [ 1458.210979] do_user_addr_fault+0x1da/0x710 [ 1458.216638] exc_page_fault+0x6d/0x200 [ 1458.221814] asm_exc_page_fault+0x26/0x30 [ 1458.227274] filldir64+0xee/0x170 [ 1458.231963] kernfs_fop_readdir+0x102/0x2e0 [ 1458.237620] iterate_dir+0xb1/0x2a0 [ 1458.242509] __x64_sys_getdents64+0x88/0x130 [ 1458.248282] do_syscall_64+0x72/0x180 [ 1458.253371] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 1458.260006] [ 1458.260006] -> #0 (&root->kernfs_rwsem){++++}-{4:4}: [ 1458.268012] check_prev_add+0xf1/0xca0 [ 1458.273187] validate_chain+0x610/0x6f0 [ 1458.278452] __lock_acquire+0x52e/0xbe0 [ 1458.283711] lock_acquire+0xc7/0x2e0 [ 1458.288678] down_write+0x32/0x1d0 [ 1458.293442] kernfs_add_one+0x34/0x380 [ 1458.298588] kernfs_create_dir_ns+0x5a/0x90 [ 1458.304214] internal_create_group+0x11e/0x2f0 [ 1458.310131] devm_device_add_group+0x4a/0x90 [ 1458.315860] msi_setup_device_data+0x60/0x110 [ 1458.321679] pci_setup_msi_context+0x19/0x60 [ 1458.327398] __pci_enable_msix_range+0x19d/0x640 [ 1458.333513] pci_alloc_irq_vectors_affinity+0xab/0x110 [ 1458.340211] vfio_pci_set_msi_trigger+0x8c/0x230 [vfio_pci_core] [ 1458.347883] vfio_pci_core_ioctl+0x2a6/0x420 [vfio_pci_core] [ 1458.355164] vfio_device_fops_unl_ioctl+0x81/0x140 [vfio] [ 1458.362155] __x64_sys_ioctl+0x93/0xc0 [ 1458.367295] do_syscall_64+0x72/0x180 [ 1458.372336] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 1458.378932] [ 1458.378932] other info that might help us debug this: [ 1458.378932] [ 1458.388965] Chain exists of: [ 1458.388965] &root->kernfs_rwsem --> &mm->mmap_lock --> &vdev->memory_lock [ 1458.388965] [ 1458.402717] Possible unsafe locking scenario: [ 1458.402717] [ 1458.410064] CPU0 CPU1 [ 1458.415495] ---- ---- [ 1458.420939] lock(&vdev->memory_lock); [ 1458.425597] lock(&mm->mmap_lock); [ 1458.432683] lock(&vdev->memory_lock); [ 1458.440153] lock(&root->kernfs_rwsem); [ 1458.444905] [ 1458.444905] *** DEADLOCK *** [ 1458.444905] [ 1458.452589] 2 locks held by CPU 0/KVM/8259: [ 1458.457627] #0: ff27171e196636b8 (&vdev->igate){+.+.}-{4:4}, at: vfio_pci_core_ioctl+0x28a/0x420 [vfio_pci_core] [ 1458.469499] #1: ff27171e19663918 (&vdev->memory_lock){++++}-{4:4}, at: vfio_pci_memory_lock_and_enable+0x2c/0x90 [vfio_pci_core] [ 1458.483306] [ 1458.483306] stack backtrace: [ 1458.488927] CPU: 169 UID: 0 PID: 8259 Comm: CPU 0/KVM Not tainted 6.15.0-rc1-0af2f6be1b42-1744803490343 #1 PREEMPT(voluntary) [ 1458.488933] Hardware name: AMD Corporation RUBY/RUBY, BIOS RRR100EB 12/05/2024 [ 1458.488936] Call Trace: [ 1458.488940] [ 1458.488944] dump_stack_lvl+0x78/0xe0 [ 1458.488954] print_circular_bug+0xd5/0xf0 [ 1458.488965] check_noncircular+0x14c/0x170 [ 1458.488970] ? srso_alias_return_thunk+0x5/0xfbef5 [ 1458.488976] ? srso_alias_return_thunk+0x5/0xfbef5 [ 1458.488980] ? find_held_lock+0x32/0x90 [ 1458.488986] ? local_clock_noinstr+0xd/0xc0 [ 1458.489001] check_prev_add+0xf1/0xca0 [ 1458.489006] ? srso_alias_return_thunk+0x5/0xfbef5 [ 1458.489015] validate_chain+0x610/0x6f0 [ 1458.489027] __lock_acquire+0x52e/0xbe0 [ 1458.489032] ? srso_alias_return_thunk+0x5/0xfbef5 [ 1458.489035] ? __lock_release+0x15d/0x2a0 [ 1458.489046] lock_acquire+0xc7/0x2e0 [ 1458.489051] ? kernfs_add_one+0x34/0x380 [ 1458.489060] ? srso_alias_return_thunk+0x5/0xfbef5 [ 1458.489063] ? srso_alias_return_thunk+0x5/0xfbef5 [ 1458.489067] ? __lock_release+0x15d/0x2a0 [ 1458.489080] down_write+0x32/0x1d0 [ 1458.489085] ? kernfs_add_one+0x34/0x380 [ 1458.489090] kernfs_add_one+0x34/0x380 [ 1458.489100] kernfs_create_dir_ns+0x5a/0x90 [ 1458.489107] internal_create_group+0x11e/0x2f0 [ 1458.489118] devm_device_add_group+0x4a/0x90 [ 1458.489128] msi_setup_device_data+0x60/0x110 [ 1458.489136] pci_setup_msi_context+0x19/0x60 [ 1458.489144] __pci_enable_msix_range+0x19d/0x640 [ 1458.489150] ? pci_conf1_read+0x4e/0xf0 [ 1458.489154] ? find_held_lock+0x32/0x90 [ 1458.489162] ? srso_alias_return_thunk+0x5/0xfbef5 [ 1458.489165] ? srso_alias_return_thunk+0x5/0xfbef5 [ 1458.489172] ? srso_alias_return_thunk+0x5/0xfbef5 [ 1458.489176] ? mark_held_locks+0x40/0x70 [ 1458.489182] ? srso_alias_return_thunk+0x5/0xfbef5 [ 1458.489191] pci_alloc_irq_vectors_affinity+0xab/0x110 [ 1458.489206] vfio_pci_set_msi_trigger+0x8c/0x230 [vfio_pci_core] [ 1458.489222] vfio_pci_core_ioctl+0x2a6/0x420 [vfio_pci_core] [ 1458.489231] ? srso_alias_return_thunk+0x5/0xfbef5 [ 1458.489241] vfio_device_fops_unl_ioctl+0x81/0x140 [vfio] [ 1458.489252] __x64_sys_ioctl+0x94/0xc0 [ 1458.489262] do_syscall_64+0x72/0x180 [ 1458.489269] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 1458.489273] RIP: 0033:0x7f0898724ded [ 1458.489279] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00 [ 1458.489282] RSP: 002b:00007f08965622a0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1458.489286] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0898724ded [ 1458.489289] RDX: 00007f07800f6d00 RSI: 0000000000003b6e RDI: 000000000000001e [ 1458.489291] RBP: 00007f08965622f0 R08: 00007f07800008e0 R09: 0000000000000001 [ 1458.489293] R10: 0000000000000007 R11: 0000000000000246 R12: 0000000000000000 [ 1458.489295] R13: fffffffffffffb28 R14: 0000000000000007 R15: 00007ffd0ef83ae0 [ 1458.489315]