[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.471846] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.814010] random: sshd: uninitialized urandom read (32 bytes read) [ 23.165157] random: sshd: uninitialized urandom read (32 bytes read) [ 23.897925] random: sshd: uninitialized urandom read (32 bytes read) [ 24.058637] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.20' (ECDSA) to the list of known hosts. [ 29.458921] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.561112] WARNING: CPU: 0 PID: 4493 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.569505] Kernel panic - not syncing: panic_on_warn set ... [ 29.569505] [ 29.576853] CPU: 0 PID: 4493 Comm: syz-executor678 Not tainted 4.17.0-rc3+ #38 [ 29.584190] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.593520] Call Trace: [ 29.596096] dump_stack+0x1b9/0x294 [ 29.599717] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.604891] ? smc_unhash_sk+0x290/0x4a0 [ 29.608935] panic+0x22f/0x4de [ 29.612108] ? add_taint.cold.5+0x16/0x16 [ 29.616241] ? __warn.cold.8+0x148/0x1b3 [ 29.620295] ? __warn.cold.8+0x117/0x1b3 [ 29.624337] ? smc_unhash_sk+0x345/0x4a0 [ 29.628384] __warn.cold.8+0x163/0x1b3 [ 29.632252] ? smc_unhash_sk+0x345/0x4a0 [ 29.636296] report_bug+0x252/0x2d0 [ 29.639904] do_error_trap+0x1de/0x490 [ 29.643771] ? graph_lock+0x170/0x170 [ 29.647553] ? math_error+0x420/0x420 [ 29.651338] ? lock_acquire+0x1dc/0x520 [ 29.655297] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.660123] do_invalid_op+0x1b/0x20 [ 29.663815] invalid_op+0x14/0x20 [ 29.667251] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 29.671895] RSP: 0018:ffff8801ad55f488 EFLAGS: 00010293 [ 29.677245] RAX: ffff8801adaa4100 RBX: ffff8801ad7397c0 RCX: ffffffff873f7cfe [ 29.684494] RDX: 0000000000000000 RSI: ffffffff873f7db5 RDI: 0000000000000005 [ 29.691742] RBP: ffff8801ad55f570 R08: ffff8801adaa4100 R09: ffffed0035ae7308 [ 29.698991] R10: ffffed0035ae7308 R11: ffff8801ad739843 R12: 1ffff10035aabe95 [ 29.706250] R13: ffff8801ad55f548 R14: ffffffff8970b1e0 R15: ffff8801ad739840 [ 29.713511] ? smc_unhash_sk+0x28e/0x4a0 [ 29.717554] ? smc_unhash_sk+0x345/0x4a0 [ 29.721596] ? smc_unhash_sk+0x345/0x4a0 [ 29.725637] ? smc_rx_data_available+0x100/0x100 [ 29.730381] ? release_sock+0x1e2/0x2b0 [ 29.734338] ? __local_bh_enable_ip+0x161/0x230 [ 29.739012] ? __release_sock+0x3a0/0x3a0 [ 29.743143] ? smc_release+0x269/0x610 [ 29.747014] ? trace_hardirqs_on+0xd/0x10 [ 29.751143] ? __local_bh_enable_ip+0x161/0x230 [ 29.755806] smc_release+0x36e/0x610 [ 29.759505] sock_release+0x96/0x1b0 [ 29.763202] ? sock_alloc_file+0x4e0/0x4e0 [ 29.767432] sock_close+0x16/0x20 [ 29.770874] __fput+0x34d/0x890 [ 29.774148] ? fput+0x1a0/0x1a0 [ 29.777411] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.781887] ____fput+0x15/0x20 [ 29.785152] task_work_run+0x1e4/0x290 [ 29.789023] ? task_work_cancel+0x240/0x240 [ 29.793331] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.798850] ? switch_task_namespaces+0xa2/0xd0 [ 29.803505] do_exit+0x1aee/0x2730 [ 29.807029] ? mm_update_next_owner+0x980/0x980 [ 29.811681] ? lock_downgrade+0x8e0/0x8e0 [ 29.815809] ? noop_count+0x40/0x40 [ 29.819418] ? lock_pin_lock+0x350/0x350 [ 29.823465] ? kasan_check_read+0x11/0x20 [ 29.827596] ? rcu_is_watching+0x85/0x140 [ 29.831742] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 29.836916] ? is_bpf_text_address+0xd7/0x170 [ 29.841397] ? check_usage_backwards+0x151/0x3a0 [ 29.846136] ? graph_lock+0x170/0x170 [ 29.849923] ? graph_lock+0x170/0x170 [ 29.853708] ? find_held_lock+0x36/0x1c0 [ 29.857762] ? lock_downgrade+0x8e0/0x8e0 [ 29.861894] ? kasan_check_read+0x11/0x20 [ 29.866021] ? do_raw_spin_unlock+0x9e/0x2e0 [ 29.870414] ? __local_bh_enable_ip+0x161/0x230 [ 29.875067] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.880072] ? release_sock+0x1e2/0x2b0 [ 29.884042] ? trace_hardirqs_on+0xd/0x10 [ 29.888180] ? __local_bh_enable_ip+0x161/0x230 [ 29.892830] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.897224] ? release_sock+0x1e2/0x2b0 [ 29.901181] ? __release_sock+0x3a0/0x3a0 [ 29.905311] ? __local_bh_enable_ip+0x161/0x230 [ 29.909973] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 29.915144] ? smc_setsockopt+0x1ed/0x630 [ 29.919276] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.924793] ? __sys_setsockopt+0x24f/0x390 [ 29.929098] do_group_exit+0x16f/0x430 [ 29.932966] ? mm_fault_error+0x380/0x380 [ 29.937094] ? __ia32_sys_exit+0x50/0x50 [ 29.941136] ? do_syscall_64+0x92/0x800 [ 29.945092] __x64_sys_exit_group+0x3e/0x50 [ 29.949393] do_syscall_64+0x1b1/0x800 [ 29.953261] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 29.958083] ? syscall_return_slowpath+0x5c0/0x5c0 [ 29.962996] ? syscall_return_slowpath+0x30f/0x5c0 [ 29.967912] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 29.973259] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.978090] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.983261] RIP: 0033:0x43e8b8 [ 29.986429] RSP: 002b:00007ffe0d1665f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 29.994122] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8b8 [ 30.001371] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.008623] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.015874] R10: 0000000020000200 R11: 0000000000000246 R12: 0000000000000001 [ 30.023126] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.030973] Dumping ftrace buffer: [ 30.034601] (ftrace buffer empty) [ 30.038291] Kernel Offset: disabled [ 30.041898] Rebooting in 86400 seconds..