[ OK ] Started Getty on tty5. [ 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 '10.128.0.242' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 55.288864][ T6780] 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. [ 55.311839][ T6780] ------------[ cut here ]------------ [ 55.317403][ T6780] kernel BUG at arch/x86/kvm/mmu/mmu.c:3719! [ 55.324309][ T6780] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 55.330378][ T6780] CPU: 1 PID: 6780 Comm: syz-executor756 Not tainted 5.7.0-rc7-next-20200529-syzkaller #0 [ 55.340240][ T6780] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.350278][ T6780] RIP: 0010:kvm_mmu_load+0xbfa/0xe00 [ 55.355547][ T6780] 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 [ 55.375154][ T6780] RSP: 0018:ffffc90001477b30 EFLAGS: 00010293 [ 55.381227][ T6780] RAX: ffff88808ba68400 RBX: 0000000000000000 RCX: ffffffff8118d661 [ 55.389173][ T6780] RDX: 0000000000000000 RSI: ffffffff8118e14a RDI: 0000000000000001 [ 55.397236][ T6780] RBP: ffff888089dfc040 R08: ffff88808ba68400 R09: ffffed1015ce719c [ 55.405180][ T6780] R10: ffff8880ae738cdb R11: ffffed1015ce719b R12: 0000000000000000 [ 55.413123][ T6780] R13: 0000000000000001 R14: ffff888089dfc458 R15: 0000000000000000 [ 55.421066][ T6780] FS: 00000000016b1880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 55.429999][ T6780] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 55.436555][ T6780] CR2: 00007f2329d226c0 CR3: 000000009c2ee000 CR4: 00000000001426e0 [ 55.444497][ T6780] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 55.452439][ T6780] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 55.460379][ T6780] Call Trace: [ 55.463690][ T6780] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 55.469643][ T6780] kvm_arch_vcpu_ioctl_run+0x4016/0x68d0 [ 55.475258][ T6780] ? kvm_arch_vcpu_runnable+0x6c0/0x6c0 [ 55.480772][ T6780] ? lock_downgrade+0x840/0x840 [ 55.485596][ T6780] ? rcu_read_lock_held_common+0xa0/0xa0 [ 55.491246][ T6780] ? check_preemption_disabled+0x38/0x220 [ 55.496937][ T6780] ? kvm_vcpu_ioctl+0x467/0xe10 [ 55.501792][ T6780] kvm_vcpu_ioctl+0x467/0xe10 [ 55.506441][ T6780] ? kvm_get_dirty_log_protect.isra.0+0x670/0x670 [ 55.512825][ T6780] ? ioctl_file_clone+0x180/0x180 [ 55.517822][ T6780] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 55.523339][ T6780] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 55.529289][ T6780] ? check_preemption_disabled+0x38/0x220 [ 55.534975][ T6780] ? check_preemption_disabled+0x38/0x220 [ 55.540665][ T6780] ? kvm_get_dirty_log_protect.isra.0+0x670/0x670 [ 55.547047][ T6780] ksys_ioctl+0x11a/0x180 [ 55.551353][ T6780] __x64_sys_ioctl+0x6f/0xb0 [ 55.555910][ T6780] do_syscall_64+0x60/0xe0 [ 55.560301][ T6780] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.566160][ T6780] RIP: 0033:0x4401f9 [ 55.570039][ T6780] 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 [ 55.589637][ T6780] RSP: 002b:00007ffcb2f66848 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 55.598032][ T6780] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401f9 [ 55.605987][ T6780] RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 [ 55.613942][ T6780] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 55.621882][ T6780] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000401a80 [ 55.629822][ T6780] R13: 0000000000401b10 R14: 0000000000000000 R15: 0000000000000000 [ 55.637780][ T6780] Modules linked in: [ 55.646577][ T6780] ---[ end trace 1fd83544911686e9 ]--- [ 55.652038][ T6780] RIP: 0010:kvm_mmu_load+0xbfa/0xe00 [ 55.657388][ T6780] 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 [ 55.677088][ T6780] RSP: 0018:ffffc90001477b30 EFLAGS: 00010293 [ 55.683141][ T6780] RAX: ffff88808ba68400 RBX: 0000000000000000 RCX: ffffffff8118d661 [ 55.691116][ T6780] RDX: 0000000000000000 RSI: ffffffff8118e14a RDI: 0000000000000001 [ 55.699114][ T6780] RBP: ffff888089dfc040 R08: ffff88808ba68400 R09: ffffed1015ce719c [ 55.707103][ T6780] R10: ffff8880ae738cdb R11: ffffed1015ce719b R12: 0000000000000000 [ 55.715056][ T6780] R13: 0000000000000001 R14: ffff888089dfc458 R15: 0000000000000000 [ 55.723046][ T6780] FS: 00000000016b1880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 55.731998][ T6780] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 55.738867][ T6780] CR2: 00007f3b1b454000 CR3: 000000009c2ee000 CR4: 00000000001426e0 [ 55.746860][ T6780] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 55.754924][ T6780] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 55.763291][ T6780] Kernel panic - not syncing: Fatal exception [ 55.770535][ T6780] Kernel Offset: disabled [ 55.774846][ T6780] Rebooting in 86400 seconds..