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When initializing a vCPU's Hyper-V object, ensure the object is fully initialized prior to exposing it through the vCPU, and ensure accesses from other tasks (e.g. other vCPUs) see the fully initialized object if vcpu->arch.hyperv is non-NULL. Lack of ordering manifests as a lockdep splat due to attempting to lock a TLB flush FIFO before the spinlock is initialized. INFO: trying to register non-static key. The code is fine but needs lockdep annotation, or maybe you didn't initialize this object before use? turning off the locking correctness validator. CPU: 1 PID: 5005 Comm: syz-executor189 Not tainted 6.6.120-smp-DEV #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: <TASK> [<ffffffff810dd10c>] dump_stack_lvl+0xcc/0x130 lib/dump_stack.c:106 [<ffffffff8192bddd>] assign_lock_key+0x1fd/0x230 kernel/locking/lockdep.c:977 [<ffffffff8191cb97>] register_lock_class+0x187/0x7a0 kernel/locking/lockdep.c:1291 [<ffffffff8191e7a9>] __lock_acquire+0x179/0x7650 kernel/locking/lockdep.c:5016 [<ffffffff8191e28f>] lock_acquire+0x13f/0x3d0 kernel/locking/lockdep.c:5756 [<ffffffff8101a65b>] __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] [<ffffffff8101a65b>] _raw_spin_lock+0x2b/0x40 kernel/locking/spinlock.c:154 [<ffffffff81319d44>] spin_lock include/linux/spinlock.h:351 [inline] [<ffffffff81319d44>] hv_tlb_flush_enqueue+0xb4/0x270 arch/x86/kvm/hyperv.c:1946 [<ffffffff813160c6>] kvm_hv_flush_tlb+0xa96/0x1dc0 arch/x86/kvm/hyperv.c:2145 [<ffffffff8131438b>] kvm_hv_hypercall+0x103b/0x1fe0 arch/x86/kvm/hyperv.c:-1 [<ffffffff8133bff3>] __vmx_handle_exit arch/x86/kvm/vmx/vmx.c:6624 [inline] [<ffffffff8133bff3>] vmx_handle_exit+0x12e3/0x21f0 arch/x86/kvm/vmx/vmx.c:6641 [<ffffffff81215d11>] vcpu_enter_guest arch/x86/kvm/x86.c:11649 [inline] [<ffffffff81215d11>] vcpu_run+0x4d01/0x79c0 arch/x86/kvm/x86.c:11832 [<ffffffff8120fe39>] kvm_arch_vcpu_ioctl_run+0xb49/0x1c80 arch/x86/kvm/x86.c:12179 [<ffffffff8119cd60>] kvm_vcpu_ioctl+0xc80/0xff0 virt/kvm/kvm_main.c:6029 [<ffffffff8226fefd>] vfs_ioctl fs/ioctl.c:52 [inline] [<ffffffff8226fefd>] __do_sys_ioctl fs/ioctl.c:872 [inline] [<ffffffff8226fefd>] __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:858 [<ffffffff85ac97d9>] do_syscall_x64 arch/x86/entry/common.c:52 [inline] [<ffffffff85ac97d9>] do_syscall_64+0x69/0xb0 arch/x86/entry/common.c:93 [<ffffffff85c000d0>] entry_SYSCALL_64_after_hwframe+0x68/0xd2 </TASK> Use the "safe" variant in all paths that are known to access the Hyper-V object, as detected by an upcoming lockdep assertion, with an assist or two from Sashiko. Link: https://lore.kernel.org/all/20260612232258.0D9131F000E9@smtp.kernel.org Fixes: |
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Linux kernel ============ The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software. Quick Start ----------- * Report a bug: See Documentation/admin-guide/reporting-issues.rst * Get the latest kernel: https://kernel.org * Build the kernel: See Documentation/admin-guide/quickly-build-trimmed-linux.rst * Join the community: https://lore.kernel.org/ Essential Documentation ----------------------- All users should be familiar with: * Building requirements: Documentation/process/changes.rst * Code of Conduct: Documentation/process/code-of-conduct.rst * License: See COPYING Documentation can be built with make htmldocs or viewed online at: https://www.kernel.org/doc/html/latest/ Who Are You? ============ Find your role below: * New Kernel Developer - Getting started with kernel development * Academic Researcher - Studying kernel internals and architecture * Security Expert - Hardening and vulnerability analysis * Backport/Maintenance Engineer - Maintaining stable kernels * System Administrator - Configuring and troubleshooting * Maintainer - Leading subsystems and reviewing patches * Hardware Vendor - Writing drivers for new hardware * Distribution Maintainer - Packaging kernels for distros * AI Coding Assistant - LLMs and AI-powered development tools For Specific Users ================== New Kernel Developer -------------------- Welcome! Start your kernel development journey here: * Getting Started: Documentation/process/development-process.rst * Your First Patch: Documentation/process/submitting-patches.rst * Coding Style: Documentation/process/coding-style.rst * Build System: Documentation/kbuild/index.rst * Development Tools: Documentation/dev-tools/index.rst * Kernel Hacking Guide: Documentation/kernel-hacking/hacking.rst * Core APIs: Documentation/core-api/index.rst Academic Researcher ------------------- Explore the kernel's architecture and internals: * Researcher Guidelines: Documentation/process/researcher-guidelines.rst * Memory Management: Documentation/mm/index.rst * Scheduler: Documentation/scheduler/index.rst * Networking Stack: Documentation/networking/index.rst * Filesystems: Documentation/filesystems/index.rst * RCU (Read-Copy Update): Documentation/RCU/index.rst * Locking Primitives: Documentation/locking/index.rst * Power Management: Documentation/power/index.rst Security Expert --------------- Security documentation and hardening guides: * Security Documentation: Documentation/security/index.rst * LSM Development: Documentation/security/lsm-development.rst * Self Protection: Documentation/security/self-protection.rst * Reporting Vulnerabilities: Documentation/process/security-bugs.rst * CVE Procedures: Documentation/process/cve.rst * Embargoed Hardware Issues: Documentation/process/embargoed-hardware-issues.rst * Security Features: Documentation/userspace-api/seccomp_filter.rst Backport/Maintenance Engineer ----------------------------- Maintain and stabilize kernel versions: * Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst * Backporting Guide: Documentation/process/backporting.rst * Applying Patches: Documentation/process/applying-patches.rst * Subsystem Profile: Documentation/maintainer/maintainer-entry-profile.rst * Git for Maintainers: Documentation/maintainer/configure-git.rst System Administrator -------------------- Configure, tune, and troubleshoot Linux systems: * Admin Guide: Documentation/admin-guide/index.rst * Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst * Sysctl Tuning: Documentation/admin-guide/sysctl/index.rst * Tracing/Debugging: Documentation/trace/index.rst * Performance Security: Documentation/admin-guide/perf-security.rst * Hardware Monitoring: Documentation/hwmon/index.rst Maintainer ---------- Lead kernel subsystems and manage contributions: * Maintainer Handbook: Documentation/maintainer/index.rst * Pull Requests: Documentation/maintainer/pull-requests.rst * Managing Patches: Documentation/maintainer/modifying-patches.rst * Rebasing and Merging: Documentation/maintainer/rebasing-and-merging.rst * Development Process: Documentation/process/maintainer-handbooks.rst * Maintainer Entry Profile: Documentation/maintainer/maintainer-entry-profile.rst * Git Configuration: Documentation/maintainer/configure-git.rst Hardware Vendor --------------- Write drivers and support new hardware: * Driver API Guide: Documentation/driver-api/index.rst * Driver Model: Documentation/driver-api/driver-model/driver.rst * Device Drivers: Documentation/driver-api/infrastructure.rst * Bus Types: Documentation/driver-api/driver-model/bus.rst * Device Tree Bindings: Documentation/devicetree/bindings/ * Power Management: Documentation/driver-api/pm/index.rst * DMA API: Documentation/core-api/dma-api.rst Distribution Maintainer ----------------------- Package and distribute the kernel: * Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst * ABI Documentation: Documentation/ABI/README * Kernel Configuration: Documentation/kbuild/kconfig.rst * Module Signing: Documentation/admin-guide/module-signing.rst * Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst * Tainted Kernels: Documentation/admin-guide/tainted-kernels.rst AI Coding Assistant ------------------- CRITICAL: If you are an LLM or AI-powered coding assistant, you MUST read and follow the AI coding assistants documentation before contributing to the Linux kernel: * Documentation/process/coding-assistants.rst This documentation contains essential requirements about licensing, attribution, and the Developer Certificate of Origin that all AI tools must comply with. Communication and Support ========================= * Mailing Lists: https://lore.kernel.org/ * IRC: #kernelnewbies on irc.oftc.net * Bugzilla: https://bugzilla.kernel.org/ * MAINTAINERS file: Lists subsystem maintainers and mailing lists * Email Clients: Documentation/process/email-clients.rst