[....] Starting OpenBSD Secure Shell server: sshd[ 18.210211] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.946287] random: sshd: uninitialized urandom read (32 bytes read) [ 22.201975] sshd (4471) used greatest stack depth: 16264 bytes left [ 22.223994] random: sshd: uninitialized urandom read (32 bytes read) [ 22.978734] random: sshd: uninitialized urandom read (32 bytes read) [ 23.137057] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.63' (ECDSA) to the list of known hosts. [ 28.610509] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.702880] WARNING: CPU: 1 PID: 4488 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 28.711278] Kernel panic - not syncing: panic_on_warn set ... [ 28.711278] [ 28.718657] CPU: 1 PID: 4488 Comm: syz-executor177 Not tainted 4.17.0-rc6+ #62 [ 28.726029] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.735373] Call Trace: [ 28.737953] dump_stack+0x1b9/0x294 [ 28.741565] ? dump_stack_print_info.cold.2+0x52/0x52 [ 28.746749] ? smc_unhash_sk+0x290/0x4a0 [ 28.750796] panic+0x22f/0x4de [ 28.753977] ? add_taint.cold.5+0x16/0x16 [ 28.758109] ? __warn.cold.8+0x148/0x1b3 [ 28.762164] ? __warn.cold.8+0x117/0x1b3 [ 28.766241] ? smc_unhash_sk+0x345/0x4a0 [ 28.770307] __warn.cold.8+0x163/0x1b3 [ 28.774183] ? smc_unhash_sk+0x345/0x4a0 [ 28.778232] report_bug+0x252/0x2d0 [ 28.781845] do_error_trap+0x1de/0x490 [ 28.785712] ? graph_lock+0x170/0x170 [ 28.789501] ? math_error+0x420/0x420 [ 28.793311] ? lock_acquire+0x1dc/0x520 [ 28.797279] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.802109] do_invalid_op+0x1b/0x20 [ 28.805834] invalid_op+0x14/0x20 [ 28.809278] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 28.813927] RSP: 0018:ffff8801c544f488 EFLAGS: 00010293 [ 28.819280] RAX: ffff8801d953a180 RBX: ffff8801ad85a7c0 RCX: ffffffff87427cfe [ 28.826548] RDX: 0000000000000000 RSI: ffffffff87427db5 RDI: 0000000000000005 [ 28.833814] RBP: ffff8801c544f570 R08: ffff8801d953a180 R09: ffffed0035b0b508 [ 28.841072] R10: ffffed0035b0b508 R11: ffff8801ad85a843 R12: 1ffff10038a89e95 [ 28.848348] R13: ffff8801c544f548 R14: ffffffff8970ea20 R15: ffff8801ad85a840 [ 28.855626] ? smc_unhash_sk+0x28e/0x4a0 [ 28.859682] ? smc_unhash_sk+0x345/0x4a0 [ 28.863738] ? smc_unhash_sk+0x345/0x4a0 [ 28.867787] ? smc_rx_data_available+0x100/0x100 [ 28.872535] ? release_sock+0x1e2/0x2b0 [ 28.876507] ? __local_bh_enable_ip+0x161/0x230 [ 28.881166] ? __release_sock+0x3a0/0x3a0 [ 28.885298] ? smc_release+0x269/0x610 [ 28.889176] ? trace_hardirqs_on+0xd/0x10 [ 28.893311] ? __local_bh_enable_ip+0x161/0x230 [ 28.897969] smc_release+0x36e/0x610 [ 28.901669] sock_release+0x96/0x1b0 [ 28.905384] ? sock_alloc_file+0x4e0/0x4e0 [ 28.909619] sock_close+0x16/0x20 [ 28.913060] __fput+0x34d/0x890 [ 28.916332] ? fput+0x1a0/0x1a0 [ 28.919607] ? _raw_spin_unlock_irq+0x27/0x70 [ 28.924088] ____fput+0x15/0x20 [ 28.927357] task_work_run+0x1e4/0x290 [ 28.931248] ? task_work_cancel+0x240/0x240 [ 28.935565] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 28.941091] ? switch_task_namespaces+0xa2/0xd0 [ 28.945746] do_exit+0x1aee/0x2730 [ 28.949276] ? mm_update_next_owner+0x980/0x980 [ 28.953928] ? lock_downgrade+0x8e0/0x8e0 [ 28.958063] ? noop_count+0x40/0x40 [ 28.961672] ? lock_pin_lock+0x350/0x350 [ 28.965717] ? kasan_check_read+0x11/0x20 [ 28.969854] ? rcu_is_watching+0x85/0x140 [ 28.973985] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 28.979175] ? is_bpf_text_address+0xd7/0x170 [ 28.983668] ? check_usage_backwards+0x151/0x3a0 [ 28.988406] ? graph_lock+0x170/0x170 [ 28.992190] ? graph_lock+0x170/0x170 [ 28.995975] ? find_held_lock+0x36/0x1c0 [ 29.000071] ? lock_downgrade+0x8e0/0x8e0 [ 29.004226] ? kasan_check_read+0x11/0x20 [ 29.008367] ? do_raw_spin_unlock+0x9e/0x2e0 [ 29.012760] ? __local_bh_enable_ip+0x161/0x230 [ 29.017501] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.022522] ? release_sock+0x1e2/0x2b0 [ 29.026494] ? trace_hardirqs_on+0xd/0x10 [ 29.030629] ? __local_bh_enable_ip+0x161/0x230 [ 29.035283] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.039679] ? release_sock+0x1e2/0x2b0 [ 29.043645] ? __release_sock+0x3a0/0x3a0 [ 29.047779] ? __local_bh_enable_ip+0x161/0x230 [ 29.052440] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 29.057618] ? smc_setsockopt+0x1ed/0x6d0 [ 29.061754] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.067290] ? __sys_setsockopt+0x24f/0x390 [ 29.071600] do_group_exit+0x16f/0x430 [ 29.075472] ? mm_fault_error+0x380/0x380 [ 29.079603] ? __ia32_sys_exit+0x50/0x50 [ 29.083663] ? do_syscall_64+0x92/0x800 [ 29.087623] __x64_sys_exit_group+0x3e/0x50 [ 29.091940] do_syscall_64+0x1b1/0x800 [ 29.095820] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 29.100667] ? syscall_return_slowpath+0x5c0/0x5c0 [ 29.105594] ? syscall_return_slowpath+0x30f/0x5c0 [ 29.110522] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 29.115881] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.120712] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.125884] RIP: 0033:0x43e8d8 [ 29.129056] RSP: 002b:00007ffc61975468 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 29.136748] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 29.144003] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 29.151265] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 29.158522] R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000001 [ 29.165777] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 29.173826] Dumping ftrace buffer: [ 29.177469] (ftrace buffer empty) [ 29.181158] Kernel Offset: disabled [ 29.184768] Rebooting in 86400 seconds..