KCSAN: data-race in install_new_memslots / kvm_mmu_page

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in install_new_memslots / kvm_mmu_page_fault (2) kvm				1	1421d	1421d	0/26	closed as invalid on 2020/06/18 14:13

================================================================== BUG: KCSAN: data-race in install_new_memslots / kvm_mmu_page_fault write to 0xffff888095200000 of 8 bytes by task 23046 on cpu 1: install_new_memslots+0xef/0x130 arch/x86/kvm/../../../virt/kvm/kvm_main.c:906 __kvm_set_memory_region+0xeea/0x1380 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1065 kvm_set_memory_region+0x36/0x60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1088 kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1100 [inline] kvm_vm_ioctl+0x6d0/0x1190 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3224 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x991/0xc60 fs/ioctl.c:696 ksys_ioctl+0xbd/0xe0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x4c/0x60 fs/ioctl.c:718 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888095200000 of 8 bytes by task 23045 on cpu 0: check_mmio_spte arch/x86/kvm/mmu.c:466 [inline] handle_mmio_page_fault arch/x86/kvm/mmu.c:4001 [inline] kvm_mmu_page_fault+0x5f0/0xbc0 arch/x86/kvm/mmu.c:5433 handle_ept_misconfig+0xbf/0x1f0 arch/x86/kvm/vmx/vmx.c:5211 vmx_handle_exit+0x1c2/0xd60 arch/x86/kvm/vmx/vmx.c:5949 vcpu_enter_guest+0xc1f/0x3820 arch/x86/kvm/x86.c:8226 vcpu_run arch/x86/kvm/x86.c:8290 [inline] kvm_arch_vcpu_ioctl_run+0x2a2/0xdc0 arch/x86/kvm/x86.c:8497 kvm_vcpu_ioctl+0x752/0xa30 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2765 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x991/0xc60 fs/ioctl.c:696 ksys_ioctl+0xbd/0xe0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x4c/0x60 fs/ioctl.c:718 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 23045 Comm: syz-executor.1 Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================