[ 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... Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.130' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 38.522477] 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. [ 38.554069] ------------[ cut here ]------------ [ 38.558895] WARNING: CPU: 1 PID: 8098 at arch/x86/kvm/vmx.c:7239 handle_desc.cold+0x11/0x18 [ 38.567360] Kernel panic - not syncing: panic_on_warn set ... [ 38.567360] [ 38.574712] CPU: 1 PID: 8098 Comm: syz-executor413 Not tainted 4.19.211-syzkaller #0 [ 38.582566] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.591909] Call Trace: [ 38.594479] dump_stack+0x1fc/0x2ef [ 38.598085] panic+0x26a/0x50e [ 38.601258] ? __warn_printk+0xf3/0xf3 [ 38.605126] ? handle_desc.cold+0x11/0x18 [ 38.609256] ? __probe_kernel_read+0x130/0x1b0 [ 38.613815] ? __warn.cold+0x5/0x5a [ 38.617604] ? __warn+0xe4/0x200 [ 38.620951] ? handle_desc.cold+0x11/0x18 [ 38.625075] __warn.cold+0x20/0x5a [ 38.628603] ? handle_desc.cold+0x11/0x18 [ 38.632729] report_bug+0x262/0x2b0 [ 38.636336] do_error_trap+0x1d7/0x310 [ 38.640202] ? math_error+0x310/0x310 [ 38.643981] ? __irq_work_queue_local+0x101/0x160 [ 38.649086] ? irq_work_queue+0x29/0x80 [ 38.653044] ? error_entry+0x72/0xd0 [ 38.656737] ? trace_hardirqs_off_caller+0x6e/0x210 [ 38.661739] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.666568] invalid_op+0x14/0x20 [ 38.670049] RIP: 0010:handle_desc.cold+0x11/0x18 [ 38.674789] Code: f9 48 c7 c7 40 ca 63 88 c6 05 97 d4 34 03 01 e8 92 c5 01 00 e9 04 b3 26 f9 e8 1d 94 70 f9 48 c7 c7 e0 c5 63 88 e8 7c c5 01 00 <0f> 0b e9 a2 be 26 f9 e8 05 94 70 f9 89 de 48 c7 c7 e0 cc 63 88 c6 [ 38.693673] RSP: 0018:ffff8880a2487968 EFLAGS: 00010286 [ 38.699012] RAX: 0000000000000024 RBX: 0000000000000000 RCX: 0000000000000000 [ 38.706272] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed1014490f1f [ 38.713519] RBP: ffff888094e08040 R08: 0000000000000024 R09: 0000000000000000 [ 38.720767] R10: 0000000000000005 R11: 0000000000000000 R12: 000000000000002e [ 38.728025] R13: ffff888094e08040 R14: 0000000000000000 R15: dffffc0000000000 [ 38.735288] ? vprintk_func+0x81/0x180 [ 38.739162] ? handle_desc.cold+0x11/0x18 [ 38.743444] ? handle_preemption_timer+0x80/0x80 [ 38.748189] vmx_handle_exit+0x26c/0xf90 [ 38.752238] ? lock_acquire+0x170/0x3c0 [ 38.756198] ? kvm_arch_vcpu_ioctl_run+0x262d/0x6f70 [ 38.761292] ? kvm_arch_vcpu_ioctl_run+0x25c4/0x6f70 [ 38.766380] kvm_arch_vcpu_ioctl_run+0x27b2/0x6f70 [ 38.771299] ? kvm_arch_vcpu_runnable+0x690/0x690 [ 38.776120] ? get_task_pid+0x143/0x2a0 [ 38.780075] ? lock_downgrade+0x720/0x720 [ 38.784203] ? check_preemption_disabled+0x41/0x280 [ 38.789199] ? check_preemption_disabled+0x41/0x280 [ 38.794197] ? kvm_vcpu_ioctl+0x493/0xe10 [ 38.798334] kvm_vcpu_ioctl+0x493/0xe10 [ 38.802301] ? lock_downgrade+0x720/0x720 [ 38.806436] ? kvm_vm_ioctl_check_extension_generic+0xb0/0xb0 [ 38.812317] ? __lock_acquire+0x6de/0x3ff0 [ 38.816533] ? lock_downgrade+0x720/0x720 [ 38.820661] ? lock_acquire+0x170/0x3c0 [ 38.824613] ? debug_object_active_state+0x104/0x330 [ 38.829700] ? mark_held_locks+0xf0/0xf0 [ 38.833739] ? kvm_vm_ioctl_check_extension_generic+0xb0/0xb0 [ 38.839688] do_vfs_ioctl+0xcdb/0x12e0 [ 38.843563] ? ioctl_preallocate+0x200/0x200 [ 38.847951] ? task_work_run+0x11c/0x1c0 [ 38.851994] ? blkcg_maybe_throttle_current+0x56c/0xc10 [ 38.857334] ? lock_downgrade+0x720/0x720 [ 38.861464] ? lock_acquire+0x170/0x3c0 [ 38.865415] ? task_work_run+0x64/0x1c0 [ 38.869368] ? blkcg_schedule_throttle+0x1f0/0x1f0 [ 38.874277] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 38.878836] ? _raw_spin_unlock_irq+0x5a/0x80 [ 38.883312] ksys_ioctl+0x9b/0xc0 [ 38.886743] __x64_sys_ioctl+0x6f/0xb0 [ 38.890609] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 38.895167] do_syscall_64+0xf9/0x620 [ 38.898947] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.904114] RIP: 0033:0x7fd80c7437a9 [ 38.907807] Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 [ 38.926683] RSP: 002b:00007ffd14cf3d38 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 38.934377] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd80c7437a9 [ 38.941622] RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 [ 38.948869] RBP: 00007fd80c7072a0 R08: 0000000000000000 R09: 0000000000000000 [ 38.956115] R10: 0000000000009120 R11: 0000000000000246 R12: 00007fd80c707330 [ 38.963362] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 38.970918] Kernel Offset: disabled [ 38.974569] Rebooting in 86400 seconds..