[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 23.962708] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 24.636805] random: sshd: uninitialized urandom read (32 bytes read) [ 24.894316] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.701969] random: sshd: uninitialized urandom read (32 bytes read) [ 27.941403] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.20' (ECDSA) to the list of known hosts. [ 33.491304] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.591039] WARNING: CPU: 0 PID: 4547 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 33.599462] Kernel panic - not syncing: panic_on_warn set ... [ 33.599462] [ 33.606815] CPU: 0 PID: 4547 Comm: syz-executor406 Not tainted 4.17.0-rc3+ #37 [ 33.614157] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.623491] Call Trace: [ 33.626074] dump_stack+0x1b9/0x294 [ 33.629683] ? dump_stack_print_info.cold.2+0x52/0x52 [ 33.634863] ? smc_unhash_sk+0x320/0x4a0 [ 33.638906] panic+0x22f/0x4de [ 33.642078] ? add_taint.cold.5+0x16/0x16 [ 33.646212] ? __warn.cold.8+0x148/0x1b3 [ 33.650257] ? __warn.cold.8+0x117/0x1b3 [ 33.654301] ? smc_unhash_sk+0x345/0x4a0 [ 33.658346] __warn.cold.8+0x163/0x1b3 [ 33.662228] ? smc_unhash_sk+0x345/0x4a0 [ 33.666274] report_bug+0x252/0x2d0 [ 33.669888] do_error_trap+0x1de/0x490 [ 33.673763] ? graph_lock+0x170/0x170 [ 33.677553] ? math_error+0x420/0x420 [ 33.681368] ? lock_acquire+0x1dc/0x520 [ 33.685353] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.690204] do_invalid_op+0x1b/0x20 [ 33.693932] invalid_op+0x14/0x20 [ 33.697379] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 33.702050] RSP: 0018:ffff8801af5af488 EFLAGS: 00010293 [ 33.707433] RAX: ffff8801acdd26c0 RBX: ffff8801acee17c0 RCX: ffffffff873f756e [ 33.714708] RDX: 0000000000000000 RSI: ffffffff873f7625 RDI: 0000000000000005 [ 33.721995] RBP: ffff8801af5af570 R08: ffff8801acdd26c0 R09: ffffed00359dc308 [ 33.729353] R10: ffffed00359dc308 R11: ffff8801acee1843 R12: 1ffff10035eb5e95 [ 33.736614] R13: ffff8801af5af548 R14: ffffffff8970b1e0 R15: ffff8801acee1840 [ 33.743890] ? smc_unhash_sk+0x28e/0x4a0 [ 33.747936] ? smc_unhash_sk+0x345/0x4a0 [ 33.751982] ? smc_unhash_sk+0x345/0x4a0 [ 33.756044] ? smc_rx_data_available+0x100/0x100 [ 33.760810] ? release_sock+0x1e2/0x2b0 [ 33.764787] ? __local_bh_enable_ip+0x161/0x230 [ 33.769451] ? __release_sock+0x3a0/0x3a0 [ 33.773590] ? smc_release+0x269/0x610 [ 33.778441] ? trace_hardirqs_on+0xd/0x10 [ 33.782587] ? __local_bh_enable_ip+0x161/0x230 [ 33.787264] smc_release+0x36e/0x610 [ 33.790971] sock_release+0x96/0x1b0 [ 33.794705] ? sock_alloc_file+0x4e0/0x4e0 [ 33.798928] sock_close+0x16/0x20 [ 33.802364] __fput+0x34d/0x890 [ 33.805635] ? fput+0x1a0/0x1a0 [ 33.808911] ? _raw_spin_unlock_irq+0x27/0x70 [ 33.813513] ____fput+0x15/0x20 [ 33.816779] task_work_run+0x1e4/0x290 [ 33.820649] ? task_work_cancel+0x240/0x240 [ 33.824957] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 33.830475] ? switch_task_namespaces+0xa2/0xd0 [ 33.835130] do_exit+0x1aee/0x2730 [ 33.838650] ? _raw_spin_unlock_bh+0x30/0x40 [ 33.843057] ? mm_update_next_owner+0x980/0x980 [ 33.847719] ? ___sys_sendmsg+0x31a/0x940 [ 33.851867] ? rcu_read_lock_sched_held+0x108/0x120 [ 33.856885] ? kfree+0x1e9/0x260 [ 33.860250] ? ___sys_sendmsg+0x31f/0x940 [ 33.864388] ? copy_msghdr_from_user+0x560/0x560 [ 33.869127] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.874136] ? graph_lock+0x170/0x170 [ 33.877931] ? pud_val+0x80/0xf0 [ 33.881291] ? __handle_mm_fault+0x93a/0x4310 [ 33.885780] ? fget_raw+0x20/0x20 [ 33.889235] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 33.893980] ? graph_lock+0x170/0x170 [ 33.897771] ? graph_lock+0x170/0x170 [ 33.901553] ? find_held_lock+0x36/0x1c0 [ 33.905604] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.911137] ? sockfd_lookup_light+0xc5/0x160 [ 33.915631] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.921163] ? __sys_sendmmsg+0x4b3/0x6f0 [ 33.925307] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 33.929724] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 33.935258] ? __handle_mm_fault+0x4310/0x4310 [ 33.939832] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.945358] ? __do_page_fault+0x441/0xe40 [ 33.949583] do_group_exit+0x16f/0x430 [ 33.953451] ? mm_fault_error+0x380/0x380 [ 33.957584] ? __ia32_sys_exit+0x50/0x50 [ 33.961629] ? do_syscall_64+0x92/0x800 [ 33.965594] __x64_sys_exit_group+0x3e/0x50 [ 33.969898] do_syscall_64+0x1b1/0x800 [ 33.973767] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 33.978609] ? syscall_return_slowpath+0x5c0/0x5c0 [ 33.983547] ? syscall_return_slowpath+0x30f/0x5c0 [ 33.988482] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 33.993842] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.998677] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.003942] RIP: 0033:0x43f2b8 [ 34.007119] RSP: 002b:00007ffd255f3998 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 34.014812] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f2b8 [ 34.022076] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 34.029331] RBP: 00000000004bec60 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 34.036589] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 34.043853] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 34.051816] Dumping ftrace buffer: [ 34.055517] (ftrace buffer empty) [ 34.059223] Kernel Offset: disabled [ 34.062850] Rebooting in 86400 seconds..