[ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ 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 '10.128.1.55' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 32.522429] 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. [ 32.561710] kvm: emulating exchange as write [ 32.773696] ------------[ cut here ]------------ [ 32.778636] WARNING: CPU: 1 PID: 8093 at arch/x86/kvm/x86.c:8115 kvm_arch_vcpu_ioctl_run.cold+0x29/0x48 [ 32.788152] Kernel panic - not syncing: panic_on_warn set ... [ 32.788152] [ 32.795725] CPU: 1 PID: 8093 Comm: syz-executor413 Not tainted 4.19.211-syzkaller #0 [ 32.803595] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.812946] Call Trace: [ 32.815531] dump_stack+0x1fc/0x2ef [ 32.819145] panic+0x26a/0x50e [ 32.822321] ? __warn_printk+0xf3/0xf3 [ 32.826191] ? kvm_arch_vcpu_ioctl_run.cold+0x29/0x48 [ 32.831364] ? __probe_kernel_read+0x130/0x1b0 [ 32.835925] ? __warn.cold+0x5/0x5a [ 32.839532] ? __warn+0xe4/0x200 [ 32.842898] ? kvm_arch_vcpu_ioctl_run.cold+0x29/0x48 [ 32.848069] __warn.cold+0x20/0x5a [ 32.851596] ? kvm_arch_vcpu_ioctl_run.cold+0x29/0x48 [ 32.856791] report_bug+0x262/0x2b0 [ 32.860520] do_error_trap+0x1d7/0x310 [ 32.864393] ? math_error+0x310/0x310 [ 32.868176] ? __irq_work_queue_local+0x101/0x160 [ 32.873001] ? irq_work_queue+0x29/0x80 [ 32.876961] ? error_entry+0x72/0xd0 [ 32.880657] ? trace_hardirqs_off_caller+0x6e/0x210 [ 32.885682] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.890512] invalid_op+0x14/0x20 [ 32.893950] RIP: 0010:kvm_arch_vcpu_ioctl_run.cold+0x29/0x48 [ 32.899846] Code: f9 e8 0b a8 70 f9 48 c7 c7 a0 23 62 88 e8 6a d9 01 00 0f 0b e9 46 aa 1b f9 e8 f3 a7 70 f9 48 c7 c7 a0 23 62 88 e8 52 d9 01 00 <0f> 0b e9 95 53 1b f9 e8 db a7 70 f9 48 c7 c7 a0 23 62 88 e8 3a d9 [ 32.918750] RSP: 0018:ffff8880b2a1fa10 EFLAGS: 00010286 [ 32.924103] RAX: 0000000000000024 RBX: 0000000000000001 RCX: 0000000000000000 [ 32.931357] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed1016543f34 [ 32.938624] RBP: ffff8880b2a1fbb0 R08: 0000000000000024 R09: 0000000000000000 [ 32.945874] R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880b025d000 [ 32.953138] R13: ffff888095478040 R14: 0000000000000000 R15: 0000000000000000 [ 32.960401] ? vprintk_func+0x81/0x180 [ 32.964277] ? do_raw_spin_unlock+0x171/0x230 [ 32.968771] ? _raw_spin_unlock+0x29/0x40 [ 32.972898] ? __mutex_lock+0x368/0x1190 [ 32.976944] ? kvm_arch_vcpu_runnable+0x690/0x690 [ 32.981818] ? synchronize_rcu_expedited+0xa0/0xa0 [ 32.986743] ? lock_downgrade+0x720/0x720 [ 32.990880] ? check_preemption_disabled+0x41/0x280 [ 32.995914] ? check_preemption_disabled+0x41/0x280 [ 33.000922] ? kvm_vcpu_ioctl+0x493/0xe10 [ 33.005053] kvm_vcpu_ioctl+0x493/0xe10 [ 33.009028] ? kvm_vm_ioctl_check_extension_generic+0xb0/0xb0 [ 33.014911] ? mark_held_locks+0xf0/0xf0 [ 33.018959] ? __lock_acquire+0x6de/0x3ff0 [ 33.023177] ? __lock_acquire+0x6de/0x3ff0 [ 33.027743] ? kvm_vm_ioctl_check_extension_generic+0xb0/0xb0 [ 33.033610] do_vfs_ioctl+0xcdb/0x12e0 [ 33.037481] ? lock_downgrade+0x720/0x720 [ 33.041629] ? check_preemption_disabled+0x41/0x280 [ 33.046623] ? ioctl_preallocate+0x200/0x200 [ 33.051029] ? __fget+0x356/0x510 [ 33.054477] ? do_dup2+0x450/0x450 [ 33.057997] ? lock_acquire+0x170/0x3c0 [ 33.061951] ? finish_task_switch+0x118/0x760 [ 33.066441] ksys_ioctl+0x9b/0xc0 [ 33.069886] __x64_sys_ioctl+0x6f/0xb0 [ 33.073753] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 33.078317] do_syscall_64+0xf9/0x620 [ 33.082102] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.087279] RIP: 0033:0x7fb0fa4b41b9 [ 33.090997] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 a1 17 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 [ 33.109882] RSP: 002b:00007fb0fa43b308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 33.117587] RAX: ffffffffffffffda RBX: 00007fb0fa5353f8 RCX: 00007fb0fa4b41b9 [ 33.124837] RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 [ 33.132100] RBP: 00007fb0fa5353f0 R08: 00007fb0fa43b700 R09: 0000000000000000 [ 33.139461] R10: 00007fb0fa43b700 R11: 0000000000000246 R12: 00007fb0fa5353fc [ 33.146725] R13: 00007fb0fa502298 R14: 6d766b2f7665642f R15: 0000000000022000 [ 33.154210] Kernel Offset: disabled [ 33.157865] Rebooting in 86400 seconds..