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helo=lists.xenproject.org; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Date: Thu, 18 May 2023 16:44:53 -0700 From: Stefano Stabellini X-X-Sender: sstabellini@ubuntu-linux-20-04-desktop To: CC: , , , , Subject: [RFC] Xen crashes on ASSERT on suspend/resume, suggested fix Message-ID: User-Agent: Alpine 2.22 (DEB 394 2020-01-19) MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6NAM11FT010:EE_|IA0PR12MB8350:EE_ X-MS-Office365-Filtering-Correlation-Id: d1b2950f-209f-4638-5800-08db57f9e260 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230028)(4636009)(7916004)(376002)(136003)(346002)(39860400002)(396003)(451199021)(46966006)(40470700004)(36840700001)(33716001)(356005)(81166007)(40480700001)(86362001)(40460700003)(82310400005)(82740400003)(44832011)(478600001)(186003)(26005)(9686003)(41300700001)(5660300002)(15650500001)(8676002)(8936002)(70206006)(70586007)(6916009)(316002)(4326008)(54906003)(2906002)(36860700001)(83380400001)(426003)(336012)(47076005)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 May 2023 23:44:55.8557 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d1b2950f-209f-4638-5800-08db57f9e260 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: DM6NAM11FT010.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB8350 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1684453555622100001 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Hi all, After many PVH Dom0 suspend/resume cycles we are seeing the following Xen crash (it is random and doesn't reproduce reliably): (XEN) [555.042981][] R arch/x86/irq.c#_clear_irq_vector+0= x214/0x2bd (XEN) [555.042986][] F destroy_irq+0xe2/0x1b8 (XEN) [555.042991][] F msi_free_irq+0x5e/0x1a7 (XEN) [555.042995][] F unmap_domain_pirq+0x441/0x4b4 (XEN) [555.043001][] F arch/x86/hvm/vmsi.c#vpci_msi_disab= le+0xc0/0x155 (XEN) [555.043006][] F vpci_msi_arch_disable+0x1e/0x2b (XEN) [555.043013][] F drivers/vpci/msi.c#control_write+0= x109/0x10e (XEN) [555.043018][] F vpci_write+0x11f/0x268 (XEN) [555.043024][] F arch/x86/hvm/io.c#vpci_portio_writ= e+0xa0/0xa7 (XEN) [555.043029][] F hvm_process_io_intercept+0x203/0x2= 6f (XEN) [555.043034][] F hvm_io_intercept+0x2a/0x4c (XEN) [555.043039][] F arch/x86/hvm/emulate.c#hvmemul_do_= io+0x29b/0x5f6 (XEN) [555.043043][] F arch/x86/hvm/emulate.c#hvmemul_do_= io_buffer+0x2f/0x6a (XEN) [555.043048][] F hvmemul_do_pio_buffer+0x33/0x35 (XEN) [555.043053][] F handle_pio+0x6d/0x1b4 (XEN) [555.043059][] F svm_vmexit_handler+0x10bf/0x18b0 (XEN) [555.043064][] F svm_stgi_label+0x8/0x18 (XEN) [555.043067] (XEN) [555.469861] (XEN) [555.471855] **************************************** (XEN) [555.477315] Panic on CPU 9: (XEN) [555.480608] Assertion 'per_cpu(vector_irq, cpu)[old_vector] =3D=3D i= rq' failed at arch/x86/irq.c:233 (XEN) [555.489882] **************************************** Looking at the code in question, the ASSERT looks wrong to me. Specifically, if you see send_cleanup_vector and irq_move_cleanup_interrupt, it is entirely possible to have old_vector still valid and also move_in_progress still set, but only some of the per_cpu(vector_irq, me)[vector] cleared. It seems to me that this could happen especially when an MSI has a large old_cpu_mask. While we go and clear per_cpu(vector_irq, me)[vector] in each CPU one by one, the state is that not all per_cpu(vector_irq, me)[vector] are cleared and old_vector is still set. If at this point we enter _clear_irq_vector, we are going to hit the ASSERT above. My suggestion was to turn the ASSERT into an if. Any better ideas? Cheers, Stefano diff --git a/xen/arch/x86/irq.c b/xen/arch/x86/irq.c index 20150b1c7f..c82c6b350a 100644 --- a/xen/arch/x86/irq.c +++ b/xen/arch/x86/irq.c @@ -230,9 +230,11 @@ static void _clear_irq_vector(struct irq_desc *desc) =20 for_each_cpu(cpu, tmp_mask) { - ASSERT(per_cpu(vector_irq, cpu)[old_vector] =3D=3D irq); - TRACE_3D(TRC_HW_IRQ_MOVE_FINISH, irq, old_vector, cpu); - per_cpu(vector_irq, cpu)[old_vector] =3D ~irq; + if ( per_cpu(vector_irq, cpu)[old_vector] =3D=3D irq ) + { + TRACE_3D(TRC_HW_IRQ_MOVE_FINISH, irq, old_vector, cpu); + per_cpu(vector_irq, cpu)[old_vector] =3D ~irq; + } } =20 release_old_vec(desc);