[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 58.372330] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 60.467804] random: sshd: uninitialized urandom read (32 bytes read) [ 60.934318] random: sshd: uninitialized urandom read (32 bytes read) [ 62.728369] random: sshd: uninitialized urandom read (32 bytes read) [ 63.104789] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.12' (ECDSA) to the list of known hosts. [ 68.969461] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 69.244201] 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. [ 69.261977] ================================================================== [ 69.269405] BUG: KMSAN: uninit-value in vmx_set_constant_host_state+0x1778/0x1830 [ 69.277038] CPU: 0 PID: 6245 Comm: syz-executor378 Not tainted 4.19.0-rc4+ #64 [ 69.284383] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.293724] Call Trace: [ 69.296306] dump_stack+0x306/0x460 [ 69.299926] ? vmx_set_constant_host_state+0x1778/0x1830 [ 69.305416] kmsan_report+0x1a2/0x2e0 [ 69.309233] __msan_warning+0x7c/0xe0 [ 69.313031] vmx_set_constant_host_state+0x1778/0x1830 [ 69.318306] vmx_create_vcpu+0x3e6f/0x7870 [ 69.322535] ? kmsan_set_origin_inline+0x6b/0x120 [ 69.327384] ? __msan_poison_alloca+0x17a/0x210 [ 69.332055] ? vmx_vm_init+0x340/0x340 [ 69.335934] kvm_arch_vcpu_create+0x25d/0x2f0 [ 69.340430] kvm_vm_ioctl+0x13fd/0x33d0 [ 69.344405] ? __msan_poison_alloca+0x17a/0x210 [ 69.349078] ? kmsan_set_origin_inline+0x6b/0x120 [ 69.353924] ? do_vfs_ioctl+0x18a/0x2810 [ 69.357978] ? __se_sys_ioctl+0x1da/0x270 [ 69.362155] ? vcpu_stat_clear_per_vm+0x420/0x420 [ 69.366988] ? vcpu_stat_clear_per_vm+0x420/0x420 [ 69.371840] do_vfs_ioctl+0xcf3/0x2810 [ 69.375751] ? security_file_ioctl+0x92/0x200 [ 69.380245] __se_sys_ioctl+0x1da/0x270 [ 69.384216] __x64_sys_ioctl+0x4a/0x70 [ 69.388110] do_syscall_64+0xbe/0x100 [ 69.391927] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 69.397106] RIP: 0033:0x440059 [ 69.400302] 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 [ 69.419204] RSP: 002b:00007fff37d87bf8 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 69.426901] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440059 [ 69.434191] RDX: 0000000000000000 RSI: 000000000000ae41 RDI: 0000000000000004 [ 69.441446] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 69.448731] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004018e0 [ 69.455996] R13: 0000000000401970 R14: 0000000000000000 R15: 0000000000000000 [ 69.463266] [ 69.464893] Local variable description: ----dt@vmx_set_constant_host_state [ 69.471924] Variable was created at: [ 69.475634] vmx_set_constant_host_state+0x2b0/0x1830 [ 69.480813] vmx_create_vcpu+0x3e6f/0x7870 [ 69.485029] ================================================================== [ 69.492373] Disabling lock debugging due to kernel taint [ 69.497805] Kernel panic - not syncing: panic_on_warn set ... [ 69.497805] [ 69.505194] CPU: 0 PID: 6245 Comm: syz-executor378 Tainted: G B 4.19.0-rc4+ #64 [ 69.513927] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.523285] Call Trace: [ 69.525880] dump_stack+0x306/0x460 [ 69.529524] panic+0x54c/0xafa [ 69.532769] ? __msan_metadata_ptr_for_store_1+0x13/0x20 [ 69.538230] kmsan_report+0x2d3/0x2e0 [ 69.542052] __msan_warning+0x7c/0xe0 [ 69.545872] vmx_set_constant_host_state+0x1778/0x1830 [ 69.551151] vmx_create_vcpu+0x3e6f/0x7870 [ 69.555383] ? kmsan_set_origin_inline+0x6b/0x120 [ 69.560221] ? __msan_poison_alloca+0x17a/0x210 [ 69.564911] ? vmx_vm_init+0x340/0x340 [ 69.568790] kvm_arch_vcpu_create+0x25d/0x2f0 [ 69.573283] kvm_vm_ioctl+0x13fd/0x33d0 [ 69.577260] ? __msan_poison_alloca+0x17a/0x210 [ 69.581935] ? kmsan_set_origin_inline+0x6b/0x120 [ 69.586793] ? do_vfs_ioctl+0x18a/0x2810 [ 69.590842] ? __se_sys_ioctl+0x1da/0x270 [ 69.594983] ? vcpu_stat_clear_per_vm+0x420/0x420 [ 69.599816] ? vcpu_stat_clear_per_vm+0x420/0x420 [ 69.604655] do_vfs_ioctl+0xcf3/0x2810 [ 69.608548] ? security_file_ioctl+0x92/0x200 [ 69.613058] __se_sys_ioctl+0x1da/0x270 [ 69.617045] __x64_sys_ioctl+0x4a/0x70 [ 69.620924] do_syscall_64+0xbe/0x100 [ 69.624720] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 69.629900] RIP: 0033:0x440059 [ 69.633083] 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 [ 69.651994] RSP: 002b:00007fff37d87bf8 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 69.659693] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440059 [ 69.666971] RDX: 0000000000000000 RSI: 000000000000ae41 RDI: 0000000000000004 [ 69.674250] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 69.681522] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004018e0 [ 69.688798] R13: 0000000000401970 R14: 0000000000000000 R15: 0000000000000000 [ 69.697014] Kernel Offset: disabled [ 69.700650] Rebooting in 86400 seconds..