[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 59.077161] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 61.271870] random: sshd: uninitialized urandom read (32 bytes read) [ 61.811064] random: sshd: uninitialized urandom read (32 bytes read) [ 63.246079] random: sshd: uninitialized urandom read (32 bytes read) [ 63.629540] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.76' (ECDSA) to the list of known hosts. [ 69.375489] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 69.647424] L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/l1tf.html for details. [ 69.665103] ================================================================== [ 69.672489] BUG: KMSAN: uninit-value in vmx_set_constant_host_state+0x1778/0x1830 [ 69.680125] CPU: 1 PID: 6208 Comm: syz-executor794 Not tainted 4.19.0-rc4+ #65 [ 69.687471] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.696814] Call Trace: [ 69.699395] dump_stack+0x306/0x460 [ 69.703017] ? vmx_set_constant_host_state+0x1778/0x1830 [ 69.708472] kmsan_report+0x1a2/0x2e0 [ 69.712281] __msan_warning+0x7c/0xe0 [ 69.716085] vmx_set_constant_host_state+0x1778/0x1830 [ 69.721363] vmx_create_vcpu+0x3e6f/0x7870 [ 69.725610] ? kmsan_set_origin_inline+0x6b/0x120 [ 69.730451] ? __msan_poison_alloca+0x17a/0x210 [ 69.735127] ? vmx_vm_init+0x340/0x340 [ 69.739010] kvm_arch_vcpu_create+0x25d/0x2f0 [ 69.743507] kvm_vm_ioctl+0x13fd/0x33d0 [ 69.747483] ? __msan_poison_alloca+0x17a/0x210 [ 69.752146] ? kmsan_set_origin_inline+0x6b/0x120 [ 69.756987] ? do_vfs_ioctl+0x18a/0x2810 [ 69.761041] ? __se_sys_ioctl+0x1da/0x270 [ 69.765185] ? vcpu_stat_clear_per_vm+0x420/0x420 [ 69.770023] ? vcpu_stat_clear_per_vm+0x420/0x420 [ 69.774858] do_vfs_ioctl+0xcf3/0x2810 [ 69.778769] ? security_file_ioctl+0x92/0x200 [ 69.783271] __se_sys_ioctl+0x1da/0x270 [ 69.787277] __x64_sys_ioctl+0x4a/0x70 [ 69.791170] do_syscall_64+0xbe/0x100 [ 69.794972] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 69.800158] RIP: 0033:0x440039 [ 69.803342] 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 [ 69.822281] RSP: 002b:00007ffcc6bfa068 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 69.830010] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440039 [ 69.837271] RDX: 0000000000000000 RSI: 000000000000ae41 RDI: 0000000000000004 [ 69.844535] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 69.851810] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004018c0 [ 69.859067] R13: 0000000000401950 R14: 0000000000000000 R15: 0000000000000000 [ 69.866342] [ 69.867962] Local variable description: ----dt@vmx_set_constant_host_state [ 69.874956] Variable was created at: [ 69.878662] vmx_set_constant_host_state+0x2b0/0x1830 [ 69.883843] vmx_create_vcpu+0x3e6f/0x7870 [ 69.888084] ================================================================== [ 69.895428] Disabling lock debugging due to kernel taint [ 69.900880] Kernel panic - not syncing: panic_on_warn set ... [ 69.900880] [ 69.908249] CPU: 1 PID: 6208 Comm: syz-executor794 Tainted: G B 4.19.0-rc4+ #65 [ 69.916990] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.926332] Call Trace: [ 69.929114] dump_stack+0x306/0x460 [ 69.932756] panic+0x54c/0xafa [ 69.936011] ? __msan_metadata_ptr_for_store_1+0x13/0x20 [ 69.941460] kmsan_report+0x2d3/0x2e0 [ 69.945269] __msan_warning+0x7c/0xe0 [ 69.949068] vmx_set_constant_host_state+0x1778/0x1830 [ 69.954374] vmx_create_vcpu+0x3e6f/0x7870 [ 69.958603] ? kmsan_set_origin_inline+0x6b/0x120 [ 69.963456] ? __msan_poison_alloca+0x17a/0x210 [ 69.968126] ? vmx_vm_init+0x340/0x340 [ 69.972030] kvm_arch_vcpu_create+0x25d/0x2f0 [ 69.976539] kvm_vm_ioctl+0x13fd/0x33d0 [ 69.980512] ? __msan_poison_alloca+0x17a/0x210 [ 69.985184] ? kmsan_set_origin_inline+0x6b/0x120 [ 69.990026] ? do_vfs_ioctl+0x18a/0x2810 [ 69.994077] ? __se_sys_ioctl+0x1da/0x270 [ 69.998220] ? vcpu_stat_clear_per_vm+0x420/0x420 [ 70.003061] ? vcpu_stat_clear_per_vm+0x420/0x420 [ 70.007896] do_vfs_ioctl+0xcf3/0x2810 [ 70.011786] ? security_file_ioctl+0x92/0x200 [ 70.016286] __se_sys_ioctl+0x1da/0x270 [ 70.020279] __x64_sys_ioctl+0x4a/0x70 [ 70.024167] do_syscall_64+0xbe/0x100 [ 70.027968] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 70.033149] RIP: 0033:0x440039 [ 70.036349] 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 [ 70.055249] RSP: 002b:00007ffcc6bfa068 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 70.062957] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440039 [ 70.070218] RDX: 0000000000000000 RSI: 000000000000ae41 RDI: 0000000000000004 [ 70.077486] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 70.084766] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004018c0 [ 70.092037] R13: 0000000000401950 R14: 0000000000000000 R15: 0000000000000000 [ 70.100245] Kernel Offset: disabled [ 70.103890] Rebooting in 86400 seconds..