Hello, syzbot found the following issue on: HEAD commit: 4b28366af7d9 x86: kmsan: enable KMSAN builds for x86 git tree: https://github.com/google/kmsan.git master console+strace: https://syzkaller.appspot.com/x/log.txt?x=126a4b60080000 kernel config: https://syzkaller.appspot.com/x/.config?x=d14e10a167d1c585 dashboard link: https://syzkaller.appspot.com/bug?extid=d6caa905917d353f0d07 compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project.git 610139d2d9ce6746b3c617fb3e2f7886272d26ff), GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14d596c4080000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10bcf08ff00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d6caa905917d353f0d07@xxxxxxxxxxxxxxxxxxxxxxxxx L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details. ===================================================== BUG: KMSAN: uninit-value in kvm_apic_set_irq arch/x86/kvm/lapic.c:634 [inline] BUG: KMSAN: uninit-value in kvm_irq_delivery_to_apic_fast+0x7a7/0x990 arch/x86/kvm/lapic.c:1044 kvm_apic_set_irq arch/x86/kvm/lapic.c:634 [inline] kvm_irq_delivery_to_apic_fast+0x7a7/0x990 arch/x86/kvm/lapic.c:1044 kvm_irq_delivery_to_apic+0xdb/0xe40 arch/x86/kvm/irq_comm.c:54 kvm_pv_kick_cpu_op+0xd1/0x100 arch/x86/kvm/x86.c:9155 kvm_emulate_hypercall+0xee7/0x1340 arch/x86/kvm/x86.c:9285 __vmx_handle_exit+0x101f/0x1710 arch/x86/kvm/vmx/vmx.c:6237 vmx_handle_exit+0x38/0x1f0 arch/x86/kvm/vmx/vmx.c:6254 vcpu_enter_guest+0x4733/0x52d0 arch/x86/kvm/x86.c:10366 vcpu_run+0x794/0x1230 arch/x86/kvm/x86.c:10455 kvm_arch_vcpu_ioctl_run+0x11fe/0x1b30 arch/x86/kvm/x86.c:10659 kvm_vcpu_ioctl+0xcd4/0x1980 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3948 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0x222/0x400 fs/ioctl.c:856 __x64_sys_ioctl+0x92/0xd0 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Local variable lapic_irq created at: kvm_pv_kick_cpu_op+0x46/0x100 arch/x86/kvm/x86.c:9146 kvm_emulate_hypercall+0xee7/0x1340 arch/x86/kvm/x86.c:9285 CPU: 1 PID: 3490 Comm: syz-executor407 Not tainted 5.19.0-rc3-syzkaller-30868-g4b28366af7d9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
