[ 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 '10.128.0.134' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 34.722758] 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. [ 34.755785] kvm: emulating exchange as write [ 34.968466] ------------[ cut here ]------------ [ 34.973287] WARNING: CPU: 0 PID: 8103 at arch/x86/kvm/x86.c:8094 kvm_arch_vcpu_ioctl_run.cold+0x11/0x48 [ 34.982798] Kernel panic - not syncing: panic_on_warn set ... [ 34.982798] [ 34.990143] CPU: 0 PID: 8103 Comm: syz-executor025 Not tainted 4.19.190-syzkaller #0 [ 34.998014] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.007351] Call Trace: [ 35.009936] dump_stack+0x1fc/0x2ef [ 35.013547] panic+0x26a/0x50e [ 35.016719] ? __warn_printk+0xf3/0xf3 [ 35.020593] ? kvm_arch_vcpu_ioctl_run.cold+0x11/0x48 [ 35.025777] ? __probe_kernel_read+0x130/0x1b0 [ 35.030339] ? __warn.cold+0x5/0x5a [ 35.033943] ? __warn+0xe4/0x200 [ 35.037292] ? kvm_arch_vcpu_ioctl_run.cold+0x11/0x48 [ 35.042472] __warn.cold+0x20/0x5a [ 35.045992] ? kvm_arch_vcpu_ioctl_run.cold+0x11/0x48 [ 35.051162] report_bug+0x262/0x2b0 [ 35.054784] do_error_trap+0x1d7/0x310 [ 35.058666] ? math_error+0x310/0x310 [ 35.062444] ? __irq_work_queue_local+0x101/0x160 [ 35.067269] ? irq_work_queue+0x29/0x80 [ 35.071224] ? error_entry+0x72/0xd0 [ 35.074920] ? trace_hardirqs_off_caller+0x6e/0x210 [ 35.079935] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.084761] invalid_op+0x14/0x20 [ 35.088196] RIP: 0010:kvm_arch_vcpu_ioctl_run.cold+0x11/0x48 [ 35.093970] Code: 4c 1c f9 e8 51 d1 71 f9 48 c7 c7 80 3d 62 88 e8 6a d9 01 00 e9 c0 5c 1c f9 e8 3b d1 71 f9 48 c7 c7 20 23 62 88 e8 54 d9 01 00 <0f> 0b e9 ed 9c 1c f9 e8 23 d1 71 f9 48 c7 c7 20 23 62 88 e8 3c d9 [ 35.112856] RSP: 0018:ffff8880b166fa10 EFLAGS: 00010286 [ 35.118264] RAX: 0000000000000024 RBX: 0000000000000001 RCX: 0000000000000000 [ 35.125513] RDX: 0000000000000000 RSI: ffffffff814dde61 RDI: ffffed10162cdf34 [ 35.132779] RBP: ffff8880b166fbb0 R08: 0000000000000024 R09: 0000000000000000 [ 35.140033] R10: 0000000000000005 R11: 0000000000000000 R12: ffff88809e72a000 [ 35.147284] R13: 0000000000000000 R14: ffff8880b160a200 R15: ffff8880b1500040 [ 35.154555] ? vprintk_func+0x81/0x180 [ 35.158442] ? do_raw_spin_unlock+0x171/0x230 [ 35.162918] ? _raw_spin_unlock+0x29/0x40 [ 35.167044] ? __mutex_lock+0x3a8/0x1260 [ 35.171090] ? kvm_arch_vcpu_runnable+0x690/0x690 [ 35.175910] ? synchronize_rcu_expedited+0xa0/0xa0 [ 35.180823] ? lock_downgrade+0x720/0x720 [ 35.184953] ? check_preemption_disabled+0x41/0x280 [ 35.189949] ? check_preemption_disabled+0x41/0x280 [ 35.194959] ? kvm_vcpu_ioctl+0x493/0xe10 [ 35.199085] kvm_vcpu_ioctl+0x493/0xe10 [ 35.203040] ? kvm_vm_ioctl_check_extension_generic+0xb0/0xb0 [ 35.208909] ? mark_held_locks+0xf0/0xf0 [ 35.212947] ? __lock_acquire+0x6de/0x3ff0 [ 35.217168] ? __lock_acquire+0x6de/0x3ff0 [ 35.221394] ? kvm_vm_ioctl_check_extension_generic+0xb0/0xb0 [ 35.227273] do_vfs_ioctl+0xcdb/0x12e0 [ 35.231140] ? lock_downgrade+0x720/0x720 [ 35.235282] ? check_preemption_disabled+0x41/0x280 [ 35.240277] ? ioctl_preallocate+0x200/0x200 [ 35.244666] ? __fget+0x356/0x510 [ 35.248099] ? do_dup2+0x450/0x450 [ 35.251619] ? lock_acquire+0x170/0x3c0 [ 35.255582] ? finish_task_switch+0x118/0x760 [ 35.260073] ksys_ioctl+0x9b/0xc0 [ 35.263505] __x64_sys_ioctl+0x6f/0xb0 [ 35.267385] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 35.271957] do_syscall_64+0xf9/0x620 [ 35.275742] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.280912] RIP: 0033:0x446a59 [ 35.284084] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 14 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 [ 35.302966] RSP: 002b:00007f4b242332f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 35.310654] RAX: ffffffffffffffda RBX: 00000000004ce4f0 RCX: 0000000000446a59 [ 35.317903] RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 [ 35.325161] RBP: 000000000049d054 R08: 00007f4b24233700 R09: 0000000000000000 [ 35.332420] R10: 00007f4b24233700 R11: 0000000000000246 R12: 000000000049c058 [ 35.339669] R13: 0000000020000408 R14: 6d766b2f7665642f R15: 00000000004ce4f8 [ 35.347468] Kernel Offset: disabled [ 35.351124] Rebooting in 86400 seconds..