[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.5' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 28.464960] 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. [ 28.495290] kvm: emulating exchange as write [ 28.706970] ------------[ cut here ]------------ [ 28.711939] WARNING: CPU: 1 PID: 7969 at arch/x86/kvm/x86.c:7534 kvm_arch_vcpu_ioctl_run+0x145/0x5c80 [ 28.721280] Kernel panic - not syncing: panic_on_warn set ... [ 28.721280] [ 28.728685] CPU: 1 PID: 7969 Comm: syz-executor260 Not tainted 4.14.244-syzkaller #0 [ 28.736554] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.746010] Call Trace: [ 28.748600] dump_stack+0x1b2/0x281 [ 28.752210] panic+0x1f9/0x42d [ 28.755392] ? add_taint.cold+0x16/0x16 [ 28.759369] ? kvm_arch_vcpu_ioctl_run+0x145/0x5c80 [ 28.764687] ? kvm_arch_vcpu_ioctl_run+0x145/0x5c80 [ 28.769694] __warn.cold+0x20/0x44 [ 28.773232] ? ist_end_non_atomic+0x10/0x10 [ 28.777645] ? kvm_arch_vcpu_ioctl_run+0x145/0x5c80 [ 28.782659] report_bug+0x208/0x250 [ 28.786281] do_error_trap+0x195/0x2d0 [ 28.790153] ? math_error+0x2d0/0x2d0 [ 28.793940] ? _synchronize_rcu_expedited+0x567/0x770 [ 28.799152] ? call_rcu_sched+0x10/0x10 [ 28.803111] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.807963] invalid_op+0x1b/0x40 [ 28.811400] RIP: 0010:kvm_arch_vcpu_ioctl_run+0x145/0x5c80 [ 28.817006] RSP: 0018:ffff88809603faf0 EFLAGS: 00010297 [ 28.822370] RAX: ffff88809b346140 RBX: ffff8880b3b4e000 RCX: ffff8880959e845c [ 28.829626] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff8880959e8268 [ 28.836874] RBP: ffff88809603fc40 R08: ffff88809b346140 R09: 0000000000000001 [ 28.844132] R10: ffff88809603fc60 R11: 0000000000000000 R12: 0000000000000000 [ 28.851539] R13: ffff8880959e8118 R14: 0000000000000000 R15: ffff8880959e8040 [ 28.858833] ? synchronize_rcu+0x98/0x130 [ 28.862962] ? kvm_arch_vcpu_runnable+0x530/0x530 [ 28.868050] ? lock_acquire+0x170/0x3f0 [ 28.872003] ? lock_downgrade+0x740/0x740 [ 28.876158] ? kvm_vcpu_ioctl+0x3de/0xc50 [ 28.880283] kvm_vcpu_ioctl+0x3de/0xc50 [ 28.884269] ? kvm_vm_ioctl_check_extension_generic+0xa0/0xa0 [ 28.890137] ? __lock_acquire+0x5fc/0x3f20 [ 28.894361] ? trace_hardirqs_on+0x10/0x10 [ 28.898582] ? trace_hardirqs_on+0x10/0x10 [ 28.902794] ? kvm_vm_ioctl_check_extension_generic+0xa0/0xa0 [ 28.908660] do_vfs_ioctl+0x75a/0xff0 [ 28.912443] ? ioctl_preallocate+0x1a0/0x1a0 [ 28.916840] ? lock_downgrade+0x740/0x740 [ 28.920984] ? __fget+0x225/0x360 [ 28.924456] ? do_vfs_ioctl+0xff0/0xff0 [ 28.928580] ? security_file_ioctl+0x83/0xb0 [ 28.932964] SyS_ioctl+0x7f/0xb0 [ 28.936655] ? do_vfs_ioctl+0xff0/0xff0 [ 28.940605] do_syscall_64+0x1d5/0x640 [ 28.944486] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 28.949662] RIP: 0033:0x4469d9 [ 28.952831] RSP: 002b:00007f3a347f4308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 28.960535] RAX: ffffffffffffffda RBX: 00000000004cb438 RCX: 00000000004469d9 [ 28.967780] RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 [ 28.975025] RBP: 00000000004cb430 R08: 00007f3a347f4700 R09: 0000000000000000 [ 28.982269] R10: 00007f3a347f4700 R11: 0000000000000246 R12: 00000000004cb43c [ 28.989532] R13: 000000000049b058 R14: 6d766b2f7665642f R15: 0000000000022000 [ 28.998226] Kernel Offset: disabled [ 29.001873] Rebooting in 86400 seconds..