[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.376719] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.539179] random: sshd: uninitialized urandom read (32 bytes read) [ 22.954271] random: sshd: uninitialized urandom read (32 bytes read) [ 23.747611] random: sshd: uninitialized urandom read (32 bytes read) [ 23.912266] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.2' (ECDSA) to the list of known hosts. [ 29.341207] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.433821] WARNING: CPU: 0 PID: 4503 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.442203] Kernel panic - not syncing: panic_on_warn set ... [ 29.442203] [ 29.449552] CPU: 0 PID: 4503 Comm: syz-executor995 Not tainted 4.17.0-rc6+ #62 [ 29.456893] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.466231] Call Trace: [ 29.468813] dump_stack+0x1b9/0x294 [ 29.472433] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.477611] ? smc_unhash_sk+0x290/0x4a0 [ 29.481654] panic+0x22f/0x4de [ 29.484827] ? add_taint.cold.5+0x16/0x16 [ 29.488957] ? __warn.cold.8+0x148/0x1b3 [ 29.492998] ? __warn.cold.8+0x117/0x1b3 [ 29.497049] ? smc_unhash_sk+0x345/0x4a0 [ 29.501089] __warn.cold.8+0x163/0x1b3 [ 29.504963] ? smc_unhash_sk+0x345/0x4a0 [ 29.509008] report_bug+0x252/0x2d0 [ 29.512625] do_error_trap+0x1de/0x490 [ 29.516492] ? graph_lock+0x170/0x170 [ 29.520281] ? math_error+0x420/0x420 [ 29.524063] ? lock_acquire+0x1dc/0x520 [ 29.528043] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.532867] do_invalid_op+0x1b/0x20 [ 29.536566] invalid_op+0x14/0x20 [ 29.540002] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 29.544656] RSP: 0018:ffff8801ac5a7488 EFLAGS: 00010293 [ 29.549997] RAX: ffff8801ac536440 RBX: ffff8801cddee7c0 RCX: ffffffff87427cfe [ 29.557340] RDX: 0000000000000000 RSI: ffffffff87427db5 RDI: 0000000000000005 [ 29.564588] RBP: ffff8801ac5a7570 R08: ffff8801ac536440 R09: ffffed0039bbdd08 [ 29.571841] R10: ffffed0039bbdd08 R11: ffff8801cddee843 R12: 1ffff100358b4e95 [ 29.579088] R13: ffff8801ac5a7548 R14: ffffffff8970ea20 R15: ffff8801cddee840 [ 29.586350] ? smc_unhash_sk+0x28e/0x4a0 [ 29.590394] ? smc_unhash_sk+0x345/0x4a0 [ 29.594439] ? smc_unhash_sk+0x345/0x4a0 [ 29.598485] ? smc_rx_data_available+0x100/0x100 [ 29.603222] ? release_sock+0x1e2/0x2b0 [ 29.607180] ? __local_bh_enable_ip+0x161/0x230 [ 29.611831] ? __release_sock+0x3a0/0x3a0 [ 29.615962] ? smc_release+0x269/0x610 [ 29.619829] ? trace_hardirqs_on+0xd/0x10 [ 29.623958] ? __local_bh_enable_ip+0x161/0x230 [ 29.628616] smc_release+0x36e/0x610 [ 29.632313] sock_release+0x96/0x1b0 [ 29.636007] ? sock_alloc_file+0x4e0/0x4e0 [ 29.640228] sock_close+0x16/0x20 [ 29.643674] __fput+0x34d/0x890 [ 29.646940] ? fput+0x1a0/0x1a0 [ 29.650202] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.654690] ____fput+0x15/0x20 [ 29.657949] task_work_run+0x1e4/0x290 [ 29.661817] ? task_work_cancel+0x240/0x240 [ 29.666127] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.671648] ? switch_task_namespaces+0xa2/0xd0 [ 29.676316] do_exit+0x1aee/0x2730 [ 29.679844] ? mm_update_next_owner+0x980/0x980 [ 29.684499] ? lock_downgrade+0x8e0/0x8e0 [ 29.688629] ? noop_count+0x40/0x40 [ 29.692244] ? lock_pin_lock+0x350/0x350 [ 29.696299] ? kasan_check_read+0x11/0x20 [ 29.700436] ? rcu_is_watching+0x85/0x140 [ 29.704566] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 29.709752] ? is_bpf_text_address+0xd7/0x170 [ 29.714233] ? check_usage_backwards+0x151/0x3a0 [ 29.718970] ? graph_lock+0x170/0x170 [ 29.722750] ? graph_lock+0x170/0x170 [ 29.726562] ? find_held_lock+0x36/0x1c0 [ 29.730612] ? lock_downgrade+0x8e0/0x8e0 [ 29.734745] ? kasan_check_read+0x11/0x20 [ 29.738879] ? do_raw_spin_unlock+0x9e/0x2e0 [ 29.743272] ? __local_bh_enable_ip+0x161/0x230 [ 29.747922] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.752921] ? release_sock+0x1e2/0x2b0 [ 29.756876] ? trace_hardirqs_on+0xd/0x10 [ 29.761008] ? __local_bh_enable_ip+0x161/0x230 [ 29.765676] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.770070] ? release_sock+0x1e2/0x2b0 [ 29.774036] ? __release_sock+0x3a0/0x3a0 [ 29.778176] ? __local_bh_enable_ip+0x161/0x230 [ 29.782838] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 29.788031] ? smc_setsockopt+0x1ed/0x6d0 [ 29.792180] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.797708] ? __sys_setsockopt+0x24f/0x390 [ 29.802029] do_group_exit+0x16f/0x430 [ 29.805915] ? mm_fault_error+0x380/0x380 [ 29.810057] ? __ia32_sys_exit+0x50/0x50 [ 29.814106] ? do_syscall_64+0x92/0x800 [ 29.818076] __x64_sys_exit_group+0x3e/0x50 [ 29.822386] do_syscall_64+0x1b1/0x800 [ 29.826270] ? syscall_return_slowpath+0x5c0/0x5c0 [ 29.831187] ? syscall_return_slowpath+0x30f/0x5c0 [ 29.836106] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 29.841457] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.846286] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.851459] RIP: 0033:0x43e8d8 [ 29.854633] RSP: 002b:00007ffc3b338238 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 29.862323] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 29.869575] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 29.876824] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 29.884074] R10: 0000000020000100 R11: 0000000000000246 R12: 0000000000000001 [ 29.891325] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 29.899166] Dumping ftrace buffer: [ 29.902799] (ftrace buffer empty) [ 29.906489] Kernel Offset: disabled [ 29.910100] Rebooting in 86400 seconds..