OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.149' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 120.437141][ T6364] 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. [ 120.490395][ T6364] ===================================================== [ 120.497403][ T6364] BUG: KMSAN: uninit-value in kvm_cpuid+0x456/0x28f0 [ 120.504144][ T6364] kvm_cpuid+0x456/0x28f0 [ 120.508501][ T6364] kvm_vcpu_reset+0x13fb/0x1c20 [ 120.513462][ T6364] kvm_apic_accept_events+0x58f/0x8c0 [ 120.518859][ T6364] vcpu_enter_guest+0xfd2/0x6d80 [ 120.523811][ T6364] vcpu_run+0x7f5/0x18d0 [ 120.528098][ T6364] kvm_arch_vcpu_ioctl_run+0x245b/0x2d10 [ 120.533746][ T6364] kvm_vcpu_ioctl+0x1055/0x1e00 [ 120.538613][ T6364] __se_sys_ioctl+0x2df/0x4a0 [ 120.543391][ T6364] __x64_sys_ioctl+0xd8/0x110 [ 120.548083][ T6364] do_syscall_64+0x54/0xd0 [ 120.552513][ T6364] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 120.558512][ T6364] [ 120.560844][ T6364] Local variable ----dummy@kvm_vcpu_reset created at: [ 120.567601][ T6364] kvm_vcpu_reset+0x1fb/0x1c20 [ 120.572381][ T6364] kvm_apic_accept_events+0x58f/0x8c0 [ 120.577765][ T6364] ===================================================== [ 120.584691][ T6364] Disabling lock debugging due to kernel taint [ 120.590835][ T6364] Kernel panic - not syncing: panic_on_kmsan set ... [ 120.597505][ T6364] CPU: 1 PID: 6364 Comm: syz-executor072 Tainted: G B 5.15.0-rc2-syzkaller #0 [ 120.607668][ T6364] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 120.617731][ T6364] Call Trace: [ 120.621013][ T6364] dump_stack_lvl+0x1ff/0x28e [ 120.625727][ T6364] dump_stack+0x25/0x28 [ 120.629904][ T6364] panic+0x44f/0xdeb [ 120.633820][ T6364] ? add_taint+0x187/0x210 [ 120.638260][ T6364] ? __msan_metadata_ptr_for_store_1+0x13/0x20 [ 120.644520][ T6364] kmsan_report+0x2ee/0x300 [ 120.649043][ T6364] ? __msan_warning+0xd7/0x150 [ 120.653922][ T6364] ? kvm_cpuid+0x456/0x28f0 [ 120.658527][ T6364] ? kvm_vcpu_reset+0x13fb/0x1c20 [ 120.663558][ T6364] ? kvm_apic_accept_events+0x58f/0x8c0 [ 120.669090][ T6364] ? vcpu_enter_guest+0xfd2/0x6d80 [ 120.674194][ T6364] ? vcpu_run+0x7f5/0x18d0 [ 120.678599][ T6364] ? kvm_arch_vcpu_ioctl_run+0x245b/0x2d10 [ 120.684409][ T6364] ? kvm_vcpu_ioctl+0x1055/0x1e00 [ 120.689420][ T6364] ? __se_sys_ioctl+0x2df/0x4a0 [ 120.694260][ T6364] ? __x64_sys_ioctl+0xd8/0x110 [ 120.699107][ T6364] ? do_syscall_64+0x54/0xd0 [ 120.703682][ T6364] ? entry_SYSCALL_64_after_hwframe+0x44/0xae [ 120.709765][ T6364] ? kmsan_get_metadata+0x11b/0x180 [ 120.714958][ T6364] __msan_warning+0xd7/0x150 [ 120.719562][ T6364] kvm_cpuid+0x456/0x28f0 [ 120.723884][ T6364] ? kmsan_internal_unpoison_memory+0x10/0x20 [ 120.730053][ T6364] kvm_vcpu_reset+0x13fb/0x1c20 [ 120.734920][ T6364] kvm_apic_accept_events+0x58f/0x8c0 [ 120.740321][ T6364] vcpu_enter_guest+0xfd2/0x6d80 [ 120.745254][ T6364] vcpu_run+0x7f5/0x18d0 [ 120.749505][ T6364] kvm_arch_vcpu_ioctl_run+0x245b/0x2d10 [ 120.755124][ T6364] kvm_vcpu_ioctl+0x1055/0x1e00 [ 120.759962][ T6364] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 120.766034][ T6364] ? security_file_ioctl+0x1bd/0x210 [ 120.771396][ T6364] ? kmsan_get_metadata+0x11b/0x180 [ 120.776632][ T6364] ? kvm_stat_data_clear+0x460/0x460 [ 120.781918][ T6364] __se_sys_ioctl+0x2df/0x4a0 [ 120.786582][ T6364] __x64_sys_ioctl+0xd8/0x110 [ 120.791254][ T6364] do_syscall_64+0x54/0xd0 [ 120.795671][ T6364] ? exc_page_fault+0x76/0x120 [ 120.800532][ T6364] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 120.806418][ T6364] RIP: 0033:0x7f51eb544a19 [ 120.810919][ T6364] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 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 c0 ff ff ff f7 d8 64 89 01 48 [ 120.830514][ T6364] RSP: 002b:00007ffe2fe74dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 120.838921][ T6364] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f51eb544a19 [ 120.846986][ T6364] RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 [ 120.854964][ T6364] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffe2fe74f68 [ 120.862942][ T6364] R10: 0000000000009120 R11: 0000000000000246 R12: 00007f51eb507c80 [ 120.870899][ T6364] R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 [ 120.879128][ T6364] Kernel Offset: disabled [ 120.883438][ T6364] Rebooting in 86400 seconds..