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	1197d	1197d	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 kvm				1	1354d	1354d	0/26	auto-closed as invalid on 2020/09/23 09:55

================================================================== BUG: KCSAN: data-race in direct_page_fault / kvm_mmu_notifier_change_pte write to 0xffffc90006baa188 of 8 bytes by task 1443 on cpu 0: 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:2925 do_wp_page+0x4c6/0x740 arch/x86/include/asm/atomic.h:95 handle_pte_fault mm/memory.c:4418 [inline] __handle_mm_fault mm/memory.c:4535 [inline] handle_mm_fault+0x1899/0x1af0 mm/memory.c:4633 do_user_addr_fault+0x380/0x770 arch/x86/mm/fault.c:1372 handle_page_fault arch/x86/mm/fault.c:1429 [inline] exc_page_fault+0xb8/0x330 arch/x86/mm/fault.c:1482 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:538 read to 0xffffc90006baa188 of 8 bytes by task 1451 on cpu 1: direct_page_fault+0x1c6/0x740 arch/x86/kvm/mmu/mmu.c:4105 kvm_tdp_page_fault+0x92/0xa0 arch/x86/kvm/mmu/mmu.c:4188 kvm_mmu_do_page_fault arch/x86/kvm/mmu.h:112 [inline] kvm_mmu_page_fault+0xca/0x410 arch/x86/kvm/mmu/mmu.c:5451 handle_ept_violation+0x2bf/0x660 arch/x86/kvm/vmx/vmx.c:5343 vmx_handle_exit+0x558/0xc30 arch/x86/kvm/vmx/vmx.c:6125 vcpu_enter_guest+0x1ada/0x2660 arch/x86/kvm/x86.c:8655 vcpu_run+0x26e/0x740 arch/x86/kvm/x86.c:8720 kvm_arch_vcpu_ioctl_run+0x38d/0x6a0 arch/x86/kvm/x86.c:8937 kvm_vcpu_ioctl+0x565/0x950 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3230 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: 1 PID: 1451 Comm: syz-executor.2 Not tainted 5.9.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================