==================================================================
BUG: KMSAN: uninit-value in native_apic_mem_read+0x54/0x60 arch/x86/include/asm/apic.h:113
CPU: 1 PID: 17936 Comm: syz-executor4 Not tainted 4.20.0-rc3+ #101
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x32d/0x480 lib/dump_stack.c:113
 kmsan_report+0x12c/0x290 mm/kmsan/kmsan.c:682
 __msan_warning+0x76/0xc0 mm/kmsan/kmsan_instr.c:316
 native_apic_mem_read+0x54/0x60 arch/x86/include/asm/apic.h:113
 apic_read arch/x86/include/asm/apic.h:392 [inline]
 smp_spurious_interrupt+0x38e/0x770 arch/x86/kernel/apic/apic.c:2044
 spurious_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:837
 </IRQ>
RIP: 0010:vmx_handle_external_intr+0x1e2/0x280 arch/x86/kvm/vmx.c:10907
Code: e3 20 4c 09 fb 48 89 c1 48 c1 e1 20 4c 09 e9 0f 85 95 00 00 00 4c 89 f4 48 89 e0 48 83 e4 f0 6a 18 50 9c 6a 10 e8 8e e4 f3 09 <eb> 05 e8 77 d8 79 00 65 48 8b 04 25 28 00 00 00 48 3b 45 d0 75 7d
RSP: 0018:ffff8880a562f528 EFLAGS: 00000082 ORIG_RAX: ffffffffffffff00
RAX: ffff8880a562f528 RBX: ffffffff8b001520 RCX: 0000000000000000
RDX: ffffffff8c91f000 RSI: fffffe0080000ef8 RDI: 0000758000000ef8
RBP: ffff8880a562f580 R08: ffff888000000000 R09: 0000000000000002
R10: 0000000000000000 R11: ffffffff812c8390 R12: fffffe0000000ef8
R13: 0000000000000000 R14: ffff8880a562f528 R15: 000000008b001520
 vcpu_enter_guest arch/x86/kvm/x86.c:7782 [inline]
 vcpu_run arch/x86/kvm/x86.c:7872 [inline]
 kvm_arch_vcpu_ioctl_run+0xac74/0x12040 arch/x86/kvm/x86.c:8072
 kvm_vcpu_ioctl+0xfe4/0x1cc0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2596
 do_vfs_ioctl+0xefc/0x2ca0 fs/ioctl.c:46
 ksys_ioctl fs/ioctl.c:713 [inline]
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl+0x1da/0x270 fs/ioctl.c:718
 __x64_sys_ioctl+0x4a/0x70 fs/ioctl.c:718
 do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457569
Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f00a4382c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006
RBP: 000000000072c040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f00a43836d4
R13: 00000000004c034e R14: 00000000004d0d60 R15: 00000000ffffffff

Local variable description: ----regs.i.i@vmx_vcpu_run
Variable was created at:
 vmx_vcpu_run+0xb7/0x7d80 arch/x86/kvm/vmx.c:11132
 vcpu_enter_guest arch/x86/kvm/x86.c:7747 [inline]
 vcpu_run arch/x86/kvm/x86.c:7872 [inline]
 kvm_arch_vcpu_ioctl_run+0xa315/0x12040 arch/x86/kvm/x86.c:8072
==================================================================