[ 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. [ 47.282543][ T4844] systemd-udevd (4844) used greatest stack depth: 22128 bytes left [ 48.285453][ T6723] scp (6723) used greatest stack depth: 21896 bytes left Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.6' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 54.904119][ T6789] 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. [ 54.929008][ T6789] ------------[ cut here ]------------ [ 54.934621][ T6789] kernel BUG at arch/x86/kvm/mmu/mmu.c:3719! [ 54.941142][ T6789] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 54.947240][ T6789] CPU: 1 PID: 6789 Comm: syz-executor073 Not tainted 5.7.0-rc7-next-20200529-syzkaller #0 [ 54.957117][ T6789] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.967486][ T6789] RIP: 0010:kvm_mmu_load+0xbfa/0xe00 [ 54.972893][ T6789] Code: ac 23 99 00 48 8b 44 24 08 e9 cf f5 ff ff e8 6d 23 99 00 e9 b7 f4 ff ff 4c 89 f7 e8 90 23 99 00 e9 78 f4 ff ff e8 56 1a 5a 00 <0f> 0b 48 89 df e8 7c 23 99 00 e9 7e f8 ff ff e8 72 23 99 00 e9 c4 [ 54.992486][ T6789] RSP: 0018:ffffc90000eb7b30 EFLAGS: 00010293 [ 54.998676][ T6789] RAX: ffff8880a8c2a3c0 RBX: 0000000000000000 RCX: ffffffff8118d661 [ 55.006639][ T6789] RDX: 0000000000000000 RSI: ffffffff8118e14a RDI: 0000000000000001 [ 55.014799][ T6789] RBP: ffff888097d80040 R08: ffff8880a8c2a3c0 R09: ffffed1015ce719c [ 55.022871][ T6789] R10: ffff8880ae738cdb R11: ffffed1015ce719b R12: 0000000000000000 [ 55.030828][ T6789] R13: 0000000000000001 R14: ffff888097d80458 R15: 0000000000000000 [ 55.038788][ T6789] FS: 0000000001225880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 55.047869][ T6789] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 55.054572][ T6789] CR2: 00007fcb2eb016c0 CR3: 00000000a87f6000 CR4: 00000000001426e0 [ 55.062717][ T6789] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 55.070958][ T6789] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 55.079042][ T6789] Call Trace: [ 55.082342][ T6789] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 55.088479][ T6789] kvm_arch_vcpu_ioctl_run+0x4016/0x68d0 [ 55.094102][ T6789] ? kvm_arch_vcpu_runnable+0x6c0/0x6c0 [ 55.099637][ T6789] ? lock_downgrade+0x840/0x840 [ 55.104609][ T6789] ? rcu_read_lock_held_common+0xa0/0xa0 [ 55.110394][ T6789] ? check_preemption_disabled+0x38/0x220 [ 55.116104][ T6789] ? kvm_vcpu_ioctl+0x467/0xe10 [ 55.120941][ T6789] kvm_vcpu_ioctl+0x467/0xe10 [ 55.125694][ T6789] ? kvm_get_dirty_log_protect.isra.0+0x670/0x670 [ 55.132100][ T6789] ? ioctl_file_clone+0x180/0x180 [ 55.137114][ T6789] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 55.142647][ T6789] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 55.148656][ T6789] ? check_preemption_disabled+0x38/0x220 [ 55.154359][ T6789] ? check_preemption_disabled+0x38/0x220 [ 55.160116][ T6789] ? kvm_get_dirty_log_protect.isra.0+0x670/0x670 [ 55.166627][ T6789] ksys_ioctl+0x11a/0x180 [ 55.170960][ T6789] __x64_sys_ioctl+0x6f/0xb0 [ 55.175543][ T6789] do_syscall_64+0x60/0xe0 [ 55.179954][ T6789] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.185837][ T6789] RIP: 0033:0x4401f9 [ 55.189720][ T6789] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 55.209362][ T6789] RSP: 002b:00007ffe5a742bb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 55.217757][ T6789] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401f9 [ 55.225711][ T6789] RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 [ 55.233666][ T6789] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 55.241755][ T6789] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000401a80 [ 55.249714][ T6789] R13: 0000000000401b10 R14: 0000000000000000 R15: 0000000000000000 [ 55.257677][ T6789] Modules linked in: [ 55.262890][ T6789] ---[ end trace 0e3f12fd9cc2ab78 ]--- [ 55.268574][ T6789] RIP: 0010:kvm_mmu_load+0xbfa/0xe00 [ 55.273870][ T6789] Code: ac 23 99 00 48 8b 44 24 08 e9 cf f5 ff ff e8 6d 23 99 00 e9 b7 f4 ff ff 4c 89 f7 e8 90 23 99 00 e9 78 f4 ff ff e8 56 1a 5a 00 <0f> 0b 48 89 df e8 7c 23 99 00 e9 7e f8 ff ff e8 72 23 99 00 e9 c4 [ 55.293546][ T6789] RSP: 0018:ffffc90000eb7b30 EFLAGS: 00010293 [ 55.299801][ T6789] RAX: ffff8880a8c2a3c0 RBX: 0000000000000000 RCX: ffffffff8118d661 [ 55.307979][ T6789] RDX: 0000000000000000 RSI: ffffffff8118e14a RDI: 0000000000000001 [ 55.315947][ T6789] RBP: ffff888097d80040 R08: ffff8880a8c2a3c0 R09: ffffed1015ce719c [ 55.324095][ T6789] R10: ffff8880ae738cdb R11: ffffed1015ce719b R12: 0000000000000000 [ 55.332127][ T6789] R13: 0000000000000001 R14: ffff888097d80458 R15: 0000000000000000 [ 55.340398][ T6789] FS: 0000000001225880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 55.349697][ T6789] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 55.356470][ T6789] CR2: 00007f575403f078 CR3: 00000000a87f6000 CR4: 00000000001426e0 [ 55.364598][ T6789] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 55.372923][ T6789] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 55.381299][ T6789] Kernel panic - not syncing: Fatal exception [ 55.388847][ T6789] Kernel Offset: disabled [ 55.393171][ T6789] Rebooting in 86400 seconds..