KCSAN: data-race in install_new_memslots / kvm_write_guest_offset

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in install_new_memslots / kvm_write_guest_offset_cached (2) kvm				2	1433d	1497d	0/26	closed as invalid on 2020/06/18 14:24

================================================================== BUG: KCSAN: data-race in install_new_memslots / kvm_write_guest_offset_cached write to 0xffff8880a8080000 of 8 bytes by task 9836 on cpu 0: install_new_memslots+0xef/0x130 arch/x86/kvm/../../../virt/kvm/kvm_main.c:972 __kvm_set_memory_region+0xeea/0x1380 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1131 kvm_set_memory_region+0x36/0x60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1154 kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1166 [inline] kvm_vm_ioctl+0x6d0/0x1190 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3293 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 0xffff8880a8080000 of 8 bytes by task 9838 on cpu 1: kvm_write_guest_offset_cached+0xba/0x240 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2196 kvm_write_guest_cached+0x38/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2217 kvm_setup_pvclock_page arch/x86/kvm/x86.c:2278 [inline] kvm_guest_time_update arch/x86/kvm/x86.c:2390 [inline] vcpu_enter_guest+0x1f71/0x3830 arch/x86/kvm/x86.c:7984 vcpu_run arch/x86/kvm/x86.c:8319 [inline] kvm_arch_vcpu_ioctl_run+0x2a2/0xdc0 arch/x86/kvm/x86.c:8526 kvm_vcpu_ioctl+0x752/0xa30 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2834 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: 1 PID: 9838 Comm: syz-executor.1 Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================