[ 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. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.143' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 56.337471][ T6790] 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. [ 56.361613][ T6790] ------------[ cut here ]------------ [ 56.367202][ T6790] kernel BUG at arch/x86/kvm/mmu/mmu.c:3722! [ 56.375508][ T6790] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 56.381577][ T6790] CPU: 0 PID: 6790 Comm: syz-executor803 Not tainted 5.7.0-rc6-next-20200522-syzkaller #0 [ 56.391536][ T6790] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.401663][ T6790] RIP: 0010:kvm_mmu_load+0xbfa/0xe00 [ 56.406926][ T6790] Code: 9c 5f 99 00 48 8b 44 24 08 e9 cf f5 ff ff e8 5d 5f 99 00 e9 b7 f4 ff ff 4c 89 f7 e8 80 5f 99 00 e9 78 f4 ff ff e8 16 4c 5a 00 <0f> 0b 48 89 df e8 6c 5f 99 00 e9 7e f8 ff ff e8 62 5f 99 00 e9 c4 [ 56.427040][ T6790] RSP: 0018:ffffc90000ea7b10 EFLAGS: 00010293 [ 56.433080][ T6790] RAX: ffff88809f87e200 RBX: 0000000000000000 RCX: ffffffff81195061 [ 56.441046][ T6790] RDX: 0000000000000000 RSI: ffffffff81195b4a RDI: 0000000000000001 [ 56.449012][ T6790] RBP: ffff8880a638c040 R08: ffff88809f87e200 R09: ffffed1015cc717c [ 56.457499][ T6790] R10: ffff8880ae638bdb R11: ffffed1015cc717b R12: 0000000000000000 [ 56.465444][ T6790] R13: 0000000000000001 R14: ffff8880a638c458 R15: 0000000000000000 [ 56.473391][ T6790] FS: 0000000001802880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 56.482290][ T6790] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 56.488843][ T6790] CR2: 00007f5a2fb326c0 CR3: 00000000a355f000 CR4: 00000000001426f0 [ 56.497317][ T6790] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 56.505266][ T6790] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 56.513214][ T6790] Call Trace: [ 56.516489][ T6790] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 56.522477][ T6790] kvm_arch_vcpu_ioctl_run+0x4022/0x6920 [ 56.528184][ T6790] ? kvm_arch_vcpu_runnable+0x6f0/0x6f0 [ 56.533795][ T6790] ? debug_smp_processor_id+0x2f/0x185 [ 56.539241][ T6790] ? lock_downgrade+0x840/0x840 [ 56.544174][ T6790] ? rcu_read_lock_held_common+0xa0/0xa0 [ 56.549838][ T6790] ? debug_smp_processor_id+0x2f/0x185 [ 56.555298][ T6790] ? kvm_vcpu_ioctl+0x46a/0xe20 [ 56.560216][ T6790] kvm_vcpu_ioctl+0x46a/0xe20 [ 56.564869][ T6790] ? kvm_get_dirty_log_protect.isra.0+0x670/0x670 [ 56.571279][ T6790] ? ioctl_file_clone+0x180/0x180 [ 56.576285][ T6790] ? debug_smp_processor_id+0x2f/0x185 [ 56.581722][ T6790] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 56.587246][ T6790] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 56.594022][ T6790] ? kvm_get_dirty_log_protect.isra.0+0x670/0x670 [ 56.600424][ T6790] ksys_ioctl+0x11a/0x180 [ 56.604757][ T6790] __x64_sys_ioctl+0x6f/0xb0 [ 56.609326][ T6790] do_syscall_64+0xf6/0x7d0 [ 56.613828][ T6790] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 56.620130][ T6790] RIP: 0033:0x4401f9 [ 56.624011][ T6790] 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 [ 56.643863][ T6790] RSP: 002b:00007ffff1c71898 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 56.652246][ T6790] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401f9 [ 56.660207][ T6790] RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 [ 56.668244][ T6790] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 56.676202][ T6790] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000401a80 [ 56.684146][ T6790] R13: 0000000000401b10 R14: 0000000000000000 R15: 0000000000000000 [ 56.692106][ T6790] Modules linked in: [ 56.703975][ T6790] ---[ end trace d90bc5c6963834cf ]--- [ 56.709458][ T6790] RIP: 0010:kvm_mmu_load+0xbfa/0xe00 [ 56.715167][ T6790] Code: 9c 5f 99 00 48 8b 44 24 08 e9 cf f5 ff ff e8 5d 5f 99 00 e9 b7 f4 ff ff 4c 89 f7 e8 80 5f 99 00 e9 78 f4 ff ff e8 16 4c 5a 00 <0f> 0b 48 89 df e8 6c 5f 99 00 e9 7e f8 ff ff e8 62 5f 99 00 e9 c4 [ 56.735838][ T6790] RSP: 0018:ffffc90000ea7b10 EFLAGS: 00010293 [ 56.741904][ T6790] RAX: ffff88809f87e200 RBX: 0000000000000000 RCX: ffffffff81195061 [ 56.750313][ T6790] RDX: 0000000000000000 RSI: ffffffff81195b4a RDI: 0000000000000001 [ 56.758975][ T6790] RBP: ffff8880a638c040 R08: ffff88809f87e200 R09: ffffed1015cc717c [ 56.768375][ T6790] R10: ffff8880ae638bdb R11: ffffed1015cc717b R12: 0000000000000000 [ 56.777246][ T6790] R13: 0000000000000001 R14: ffff8880a638c458 R15: 0000000000000000 [ 56.786677][ T6790] FS: 0000000001802880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 56.795933][ T6790] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 56.802502][ T6790] CR2: 00007ffb8b7d3000 CR3: 00000000a355f000 CR4: 00000000001426f0 [ 56.810509][ T6790] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 56.818951][ T6790] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 56.827135][ T6790] Kernel panic - not syncing: Fatal exception [ 56.834001][ T6790] Kernel Offset: disabled [ 56.838319][ T6790] Rebooting in 86400 seconds..