[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.219145] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.271791] random: sshd: uninitialized urandom read (32 bytes read) [ 25.633474] random: sshd: uninitialized urandom read (32 bytes read) [ 26.462648] random: sshd: uninitialized urandom read (32 bytes read) [ 26.631564] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.60' (ECDSA) to the list of known hosts. [ 32.064088] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.161777] WARNING: CPU: 1 PID: 4555 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 32.170274] Kernel panic - not syncing: panic_on_warn set ... [ 32.170274] [ 32.177652] CPU: 1 PID: 4555 Comm: syz-executor016 Not tainted 4.17.0-rc6+ #60 [ 32.185018] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.194379] Call Trace: [ 32.196989] dump_stack+0x1b9/0x294 [ 32.200636] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.205845] ? smc_unhash_sk+0x270/0x4a0 [ 32.209914] panic+0x22f/0x4de [ 32.213102] ? add_taint.cold.5+0x16/0x16 [ 32.217245] ? __warn.cold.8+0x148/0x1b3 [ 32.221304] ? __warn.cold.8+0x117/0x1b3 [ 32.225368] ? smc_unhash_sk+0x345/0x4a0 [ 32.229455] __warn.cold.8+0x163/0x1b3 [ 32.233355] ? smc_unhash_sk+0x345/0x4a0 [ 32.237452] report_bug+0x252/0x2d0 [ 32.241095] do_error_trap+0x1de/0x490 [ 32.244999] ? graph_lock+0x170/0x170 [ 32.248828] ? math_error+0x420/0x420 [ 32.252651] ? lock_acquire+0x1dc/0x520 [ 32.256655] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.261522] do_invalid_op+0x1b/0x20 [ 32.265259] invalid_op+0x14/0x20 [ 32.268721] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 32.273373] RSP: 0018:ffff8801cf217488 EFLAGS: 00010293 [ 32.278742] RAX: ffff8801ae2ba380 RBX: ffff8801d95e97c0 RCX: ffffffff8741d11e [ 32.286025] RDX: 0000000000000000 RSI: ffffffff8741d1d5 RDI: 0000000000000005 [ 32.293418] RBP: ffff8801cf217570 R08: ffff8801ae2ba380 R09: ffffed003b2bd308 [ 32.300692] R10: ffffed003b2bd308 R11: ffff8801d95e9843 R12: 1ffff10039e42e95 [ 32.307973] R13: ffff8801cf217548 R14: ffffffff8970e020 R15: ffff8801d95e9840 [ 32.315279] ? smc_unhash_sk+0x28e/0x4a0 [ 32.319339] ? smc_unhash_sk+0x345/0x4a0 [ 32.323408] ? smc_unhash_sk+0x345/0x4a0 [ 32.327481] ? smc_rx_data_available+0x100/0x100 [ 32.332250] ? release_sock+0x1e2/0x2b0 [ 32.336230] ? __local_bh_enable_ip+0x161/0x230 [ 32.340907] ? __release_sock+0x3a0/0x3a0 [ 32.345066] ? smc_release+0x269/0x610 [ 32.348962] ? trace_hardirqs_on+0xd/0x10 [ 32.353123] ? __local_bh_enable_ip+0x161/0x230 [ 32.357803] smc_release+0x36e/0x610 [ 32.361537] sock_release+0x96/0x1b0 [ 32.365266] ? sock_alloc_file+0x4e0/0x4e0 [ 32.369524] sock_close+0x16/0x20 [ 32.373031] __fput+0x34d/0x890 [ 32.376415] ? fput+0x1a0/0x1a0 [ 32.379715] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.384228] ____fput+0x15/0x20 [ 32.387497] task_work_run+0x1e4/0x290 [ 32.391384] ? task_work_cancel+0x240/0x240 [ 32.395709] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.401240] ? switch_task_namespaces+0xa2/0xd0 [ 32.405908] do_exit+0x1aee/0x2730 [ 32.409440] ? mm_update_next_owner+0x980/0x980 [ 32.414111] ? lock_downgrade+0x8e0/0x8e0 [ 32.418246] ? noop_count+0x40/0x40 [ 32.421859] ? lock_pin_lock+0x350/0x350 [ 32.425914] ? kasan_check_read+0x11/0x20 [ 32.430058] ? rcu_is_watching+0x85/0x140 [ 32.434212] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 32.439426] ? is_bpf_text_address+0xd7/0x170 [ 32.443953] ? check_usage_backwards+0x151/0x3a0 [ 32.448703] ? graph_lock+0x170/0x170 [ 32.452488] ? graph_lock+0x170/0x170 [ 32.456279] ? find_held_lock+0x36/0x1c0 [ 32.460334] ? lock_downgrade+0x8e0/0x8e0 [ 32.464489] ? kasan_check_read+0x11/0x20 [ 32.468638] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.473056] ? __local_bh_enable_ip+0x161/0x230 [ 32.477726] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.482750] ? release_sock+0x1e2/0x2b0 [ 32.486745] ? trace_hardirqs_on+0xd/0x10 [ 32.490913] ? __local_bh_enable_ip+0x161/0x230 [ 32.495680] ? _raw_spin_unlock_bh+0x30/0x40 [ 32.500189] ? release_sock+0x1e2/0x2b0 [ 32.504162] ? __release_sock+0x3a0/0x3a0 [ 32.508333] ? __local_bh_enable_ip+0x161/0x230 [ 32.513037] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 32.518244] ? smc_setsockopt+0x1ed/0x6d0 [ 32.522389] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.527925] ? __sys_setsockopt+0x24f/0x390 [ 32.532257] do_group_exit+0x16f/0x430 [ 32.536144] ? mm_fault_error+0x380/0x380 [ 32.540281] ? __ia32_sys_exit+0x50/0x50 [ 32.544352] ? do_syscall_64+0x92/0x800 [ 32.548330] __x64_sys_exit_group+0x3e/0x50 [ 32.552636] do_syscall_64+0x1b1/0x800 [ 32.556536] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.561483] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.566429] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.571802] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.576652] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.581841] RIP: 0033:0x43e8d8 [ 32.585036] RSP: 002b:00007ffd220cb1d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.592759] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 32.600044] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.607321] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.614608] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 32.621886] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.629875] Dumping ftrace buffer: [ 32.633638] (ftrace buffer empty) [ 32.637341] Kernel Offset: disabled [ 32.640955] Rebooting in 86400 seconds..