KCSAN: data-race in direct_page_fault / kvm_mmu_notifier_change

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in direct_page_fault / kvm_mmu_notifier_change_pte (3) kvm				1	1188d	1188d	0/26	auto-closed as invalid on 2021/02/27 13:37
upstream	KCSAN: data-race in direct_page_fault / kvm_mmu_notifier_change_pte (2) kvm				1	1300d	1300d	0/26	auto-closed as invalid on 2020/11/07 23:13

================================================================== BUG: KCSAN: data-race in direct_page_fault / kvm_mmu_notifier_change_pte write to 0xffffc90001762188 of 8 bytes by task 13500 on cpu 1: kvm_mmu_notifier_change_pte+0x66/0x1a0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:462 __mmu_notifier_change_pte+0x82/0x100 mm/mmu_notifier.c:438 mmu_notifier_change_pte include/linux/mmu_notifier.h:442 [inline] wp_page_copy+0x8b3/0x1710 mm/memory.c:2724 do_wp_page+0x9b2/0xd80 arch/x86/include/asm/atomic.h:95 handle_pte_fault mm/memory.c:4242 [inline] __handle_mm_fault mm/memory.c:4359 [inline] handle_mm_fault+0x1899/0x1af0 mm/memory.c:4457 do_user_addr_fault+0x380/0x770 arch/x86/mm/fault.c:1294 handle_page_fault arch/x86/mm/fault.c:1351 [inline] exc_page_fault+0xb8/0x330 arch/x86/mm/fault.c:1404 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:538 read to 0xffffc90001762188 of 8 bytes by task 13505 on cpu 0: direct_page_fault+0x1c6/0x740 arch/x86/kvm/mmu/mmu.c:4104 kvm_tdp_page_fault+0x92/0xa0 arch/x86/kvm/mmu/mmu.c:4187 kvm_mmu_do_page_fault arch/x86/kvm/mmu.h:112 [inline] kvm_mmu_page_fault+0xca/0x410 arch/x86/kvm/mmu/mmu.c:5450 handle_ept_violation+0x275/0x610 arch/x86/kvm/vmx/vmx.c:5337 vmx_handle_exit+0x56b/0xc20 arch/x86/kvm/vmx/vmx.c:6118 vcpu_enter_guest+0x1ada/0x2660 arch/x86/kvm/x86.c:8641 vcpu_run+0x26e/0x740 arch/x86/kvm/x86.c:8706 kvm_arch_vcpu_ioctl_run+0x38d/0x6a0 arch/x86/kvm/x86.c:8923 kvm_vcpu_ioctl+0x565/0x950 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3229 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:739 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:739 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 13505 Comm: syz-executor.5 Not tainted 5.9.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================