[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 24.081316] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.753082] random: sshd: uninitialized urandom read (32 bytes read) [ 27.334706] random: sshd: uninitialized urandom read (32 bytes read) [ 28.170634] random: sshd: uninitialized urandom read (32 bytes read) [ 28.354139] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.13' (ECDSA) to the list of known hosts. [ 33.821498] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.923325] WARNING: CPU: 1 PID: 4566 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 33.931741] Kernel panic - not syncing: panic_on_warn set ... [ 33.931741] [ 33.939111] CPU: 1 PID: 4566 Comm: syz-executor998 Not tainted 4.17.0-rc3+ #40 [ 33.946470] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.955830] Call Trace: [ 33.958420] dump_stack+0x1b9/0x294 [ 33.962050] ? dump_stack_print_info.cold.2+0x52/0x52 [ 33.967254] ? smc_unhash_sk+0x280/0x4a0 [ 33.971318] panic+0x22f/0x4de [ 33.974505] ? add_taint.cold.5+0x16/0x16 [ 33.978644] ? __warn.cold.8+0x148/0x1b3 [ 33.982728] ? __warn.cold.8+0x117/0x1b3 [ 33.986794] ? smc_unhash_sk+0x345/0x4a0 [ 33.990863] __warn.cold.8+0x163/0x1b3 [ 33.994747] ? smc_unhash_sk+0x345/0x4a0 [ 33.998803] report_bug+0x252/0x2d0 [ 34.002428] do_error_trap+0x1de/0x490 [ 34.006305] ? graph_lock+0x170/0x170 [ 34.010104] ? math_error+0x420/0x420 [ 34.013908] ? lock_acquire+0x1dc/0x520 [ 34.017879] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.022716] do_invalid_op+0x1b/0x20 [ 34.026422] invalid_op+0x14/0x20 [ 34.029883] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 34.034546] RSP: 0018:ffff8801afd57488 EFLAGS: 00010293 [ 34.039902] RAX: ffff8801ad586540 RBX: ffff8801d93e37c0 RCX: ffffffff87402a0e [ 34.047165] RDX: 0000000000000000 RSI: ffffffff87402ac5 RDI: 0000000000000005 [ 34.054447] RBP: ffff8801afd57570 R08: ffff8801ad586540 R09: ffffed003b27c708 [ 34.061717] R10: ffffed003b27c708 R11: ffff8801d93e3843 R12: 1ffff10035faae95 [ 34.069010] R13: ffff8801afd57548 R14: ffffffff8970caa0 R15: ffff8801d93e3840 [ 34.076294] ? smc_unhash_sk+0x28e/0x4a0 [ 34.080346] ? smc_unhash_sk+0x345/0x4a0 [ 34.084406] ? smc_unhash_sk+0x345/0x4a0 [ 34.088467] ? smc_rx_data_available+0x100/0x100 [ 34.093218] ? release_sock+0x1e2/0x2b0 [ 34.097193] ? __local_bh_enable_ip+0x161/0x230 [ 34.101885] ? __release_sock+0x3a0/0x3a0 [ 34.106086] ? smc_release+0x269/0x610 [ 34.109988] ? trace_hardirqs_on+0xd/0x10 [ 34.114140] ? __local_bh_enable_ip+0x161/0x230 [ 34.118806] smc_release+0x36e/0x610 [ 34.122514] sock_release+0x96/0x1b0 [ 34.126227] ? sock_alloc_file+0x4e0/0x4e0 [ 34.130463] sock_close+0x16/0x20 [ 34.133943] __fput+0x34d/0x890 [ 34.137233] ? fput+0x1a0/0x1a0 [ 34.140521] ? _raw_spin_unlock_irq+0x27/0x70 [ 34.145125] ____fput+0x15/0x20 [ 34.148423] task_work_run+0x1e4/0x290 [ 34.152330] ? task_work_cancel+0x240/0x240 [ 34.156670] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 34.162242] ? switch_task_namespaces+0xa2/0xd0 [ 34.166925] do_exit+0x1aee/0x2730 [ 34.170463] ? mm_update_next_owner+0x980/0x980 [ 34.175136] ? lock_downgrade+0x8e0/0x8e0 [ 34.179289] ? noop_count+0x40/0x40 [ 34.182910] ? lock_pin_lock+0x350/0x350 [ 34.186984] ? kasan_check_read+0x11/0x20 [ 34.191130] ? rcu_is_watching+0x85/0x140 [ 34.195282] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 34.200479] ? is_bpf_text_address+0xd7/0x170 [ 34.205011] ? check_usage_backwards+0x151/0x3a0 [ 34.209776] ? graph_lock+0x170/0x170 [ 34.213566] ? graph_lock+0x170/0x170 [ 34.217380] ? find_held_lock+0x36/0x1c0 [ 34.221454] ? lock_downgrade+0x8e0/0x8e0 [ 34.225611] ? kasan_check_read+0x11/0x20 [ 34.229756] ? do_raw_spin_unlock+0x9e/0x2e0 [ 34.234167] ? __local_bh_enable_ip+0x161/0x230 [ 34.238838] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 34.243857] ? release_sock+0x1e2/0x2b0 [ 34.247832] ? trace_hardirqs_on+0xd/0x10 [ 34.251992] ? __local_bh_enable_ip+0x161/0x230 [ 34.256667] ? _raw_spin_unlock_bh+0x30/0x40 [ 34.261083] ? release_sock+0x1e2/0x2b0 [ 34.265071] ? __release_sock+0x3a0/0x3a0 [ 34.269228] ? __local_bh_enable_ip+0x161/0x230 [ 34.273902] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 34.279102] ? smc_setsockopt+0x1ed/0x630 [ 34.283257] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.288800] ? __sys_setsockopt+0x24f/0x390 [ 34.293127] do_group_exit+0x16f/0x430 [ 34.297022] ? mm_fault_error+0x380/0x380 [ 34.301181] ? __ia32_sys_exit+0x50/0x50 [ 34.305248] ? do_syscall_64+0x92/0x800 [ 34.309252] __x64_sys_exit_group+0x3e/0x50 [ 34.313574] do_syscall_64+0x1b1/0x800 [ 34.317455] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 34.322297] ? syscall_return_slowpath+0x5c0/0x5c0 [ 34.327231] ? syscall_return_slowpath+0x30f/0x5c0 [ 34.332167] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 34.337538] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.342389] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.347576] RIP: 0033:0x43e8b8 [ 34.350768] RSP: 002b:00007ffd4e4bea88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 34.358479] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8b8 [ 34.365751] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 34.373027] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 34.380340] R10: 0000000020000200 R11: 0000000000000246 R12: 0000000000000001 [ 34.387598] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 34.395710] Dumping ftrace buffer: [ 34.399432] (ftrace buffer empty) [ 34.403351] Kernel Offset: disabled [ 34.407003] Rebooting in 86400 seconds..