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 kvm				1	1629d	1629d	0/26	closed as invalid on 2019/11/19 13:24

================================================================== BUG: KCSAN: data-race in install_new_memslots / kvm_mmu_page_fault write to 0xffff88807ec43000 of 8 bytes by task 2421 on cpu 0: install_new_memslots+0xe9/0x130 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1077 kvm_set_memslot+0x800/0xb70 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1153 __kvm_set_memory_region+0x91c/0xc20 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1300 kvm_set_memory_region+0x31/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1321 kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1333 [inline] kvm_vm_ioctl+0x662/0x18b0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3604 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x101/0x150 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x47/0x60 fs/ioctl.c:770 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88807ec43000 of 8 bytes by task 2410 on cpu 1: check_mmio_spte arch/x86/kvm/mmu/mmu.c:504 [inline] handle_mmio_page_fault arch/x86/kvm/mmu/mmu.c:4016 [inline] kvm_mmu_page_fault+0x52d/0xac0 arch/x86/kvm/mmu/mmu.c:5440 handle_ept_misconfig+0xbc/0x240 arch/x86/kvm/vmx/vmx.c:5214 vmx_handle_exit+0x1de/0xfe0 arch/x86/kvm/vmx/vmx.c:5980 vcpu_enter_guest+0xc00/0x3740 arch/x86/kvm/x86.c:8481 vcpu_run arch/x86/kvm/x86.c:8544 [inline] kvm_arch_vcpu_ioctl_run+0x281/0xd60 arch/x86/kvm/x86.c:8766 kvm_vcpu_ioctl+0x70b/0x9d0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3138 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x101/0x150 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x47/0x60 fs/ioctl.c:770 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 2410 Comm: syz-executor.4 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================