[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.636416] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.805874] random: sshd: uninitialized urandom read (32 bytes read) [ 22.138536] random: sshd: uninitialized urandom read (32 bytes read) [ 22.912678] random: sshd: uninitialized urandom read (32 bytes read) [ 23.067755] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.47' (ECDSA) to the list of known hosts. [ 28.569331] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.667990] WARNING: CPU: 1 PID: 4488 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 28.676360] Kernel panic - not syncing: panic_on_warn set ... [ 28.676360] [ 28.683708] CPU: 1 PID: 4488 Comm: syz-executor186 Not tainted 4.17.0-rc4+ #52 [ 28.691054] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.700392] Call Trace: [ 28.702962] dump_stack+0x1b9/0x294 [ 28.706578] ? dump_stack_print_info.cold.2+0x52/0x52 [ 28.711759] ? smc_unhash_sk+0x2f0/0x4a0 [ 28.715803] panic+0x22f/0x4de [ 28.718973] ? add_taint.cold.5+0x16/0x16 [ 28.723101] ? __warn.cold.8+0x148/0x1b3 [ 28.727167] ? __warn.cold.8+0x117/0x1b3 [ 28.731213] ? smc_unhash_sk+0x345/0x4a0 [ 28.735263] __warn.cold.8+0x163/0x1b3 [ 28.739128] ? smc_unhash_sk+0x345/0x4a0 [ 28.743173] report_bug+0x252/0x2d0 [ 28.746779] do_error_trap+0x1de/0x490 [ 28.750652] ? graph_lock+0x170/0x170 [ 28.754432] ? math_error+0x420/0x420 [ 28.758216] ? lock_acquire+0x1dc/0x520 [ 28.762172] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.766993] do_invalid_op+0x1b/0x20 [ 28.770694] invalid_op+0x14/0x20 [ 28.774129] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 28.778772] RSP: 0018:ffff8801ac80f488 EFLAGS: 00010293 [ 28.784113] RAX: ffff8801ac8366c0 RBX: ffff8801acc9d7c0 RCX: ffffffff8740fa9e [ 28.791364] RDX: 0000000000000000 RSI: ffffffff8740fb55 RDI: 0000000000000005 [ 28.799060] RBP: ffff8801ac80f570 R08: ffff8801ac8366c0 R09: ffffed0035993b08 [ 28.806326] R10: ffffed0035993b08 R11: ffff8801acc9d843 R12: 1ffff10035901e95 [ 28.813592] R13: ffff8801ac80f548 R14: ffffffff8970dc60 R15: ffff8801acc9d840 [ 28.820855] ? smc_unhash_sk+0x28e/0x4a0 [ 28.824895] ? smc_unhash_sk+0x345/0x4a0 [ 28.828944] ? smc_unhash_sk+0x345/0x4a0 [ 28.832992] ? smc_rx_data_available+0x100/0x100 [ 28.837727] ? release_sock+0x1e2/0x2b0 [ 28.841682] ? __local_bh_enable_ip+0x161/0x230 [ 28.846335] ? __release_sock+0x3a0/0x3a0 [ 28.850462] ? smc_release+0x269/0x610 [ 28.854328] ? trace_hardirqs_on+0xd/0x10 [ 28.858455] ? __local_bh_enable_ip+0x161/0x230 [ 28.863114] smc_release+0x36e/0x610 [ 28.866811] sock_release+0x96/0x1b0 [ 28.870506] ? sock_alloc_file+0x4e0/0x4e0 [ 28.874724] sock_close+0x16/0x20 [ 28.878161] __fput+0x34d/0x890 [ 28.881423] ? fput+0x1a0/0x1a0 [ 28.884684] ? _raw_spin_unlock_irq+0x27/0x70 [ 28.889167] ____fput+0x15/0x20 [ 28.892430] task_work_run+0x1e4/0x290 [ 28.896303] ? task_work_cancel+0x240/0x240 [ 28.900607] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 28.906125] ? switch_task_namespaces+0xa2/0xd0 [ 28.910776] do_exit+0x1aee/0x2730 [ 28.914301] ? mm_update_next_owner+0x980/0x980 [ 28.918949] ? lock_downgrade+0x8e0/0x8e0 [ 28.923085] ? noop_count+0x40/0x40 [ 28.926695] ? lock_pin_lock+0x350/0x350 [ 28.930739] ? kasan_check_read+0x11/0x20 [ 28.934869] ? rcu_is_watching+0x85/0x140 [ 28.938996] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 28.944175] ? is_bpf_text_address+0xd7/0x170 [ 28.948663] ? check_usage_backwards+0x151/0x3a0 [ 28.953401] ? graph_lock+0x170/0x170 [ 28.957185] ? graph_lock+0x170/0x170 [ 28.960979] ? find_held_lock+0x36/0x1c0 [ 28.965029] ? lock_downgrade+0x8e0/0x8e0 [ 28.969163] ? kasan_check_read+0x11/0x20 [ 28.973293] ? do_raw_spin_unlock+0x9e/0x2e0 [ 28.977682] ? __local_bh_enable_ip+0x161/0x230 [ 28.982328] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.987323] ? release_sock+0x1e2/0x2b0 [ 28.991274] ? trace_hardirqs_on+0xd/0x10 [ 28.995398] ? __local_bh_enable_ip+0x161/0x230 [ 29.000053] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.004441] ? release_sock+0x1e2/0x2b0 [ 29.008395] ? __release_sock+0x3a0/0x3a0 [ 29.012523] ? __local_bh_enable_ip+0x161/0x230 [ 29.017173] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 29.022348] ? smc_setsockopt+0x1ed/0x6d0 [ 29.026483] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.032000] ? __sys_setsockopt+0x24f/0x390 [ 29.036307] do_group_exit+0x16f/0x430 [ 29.040173] ? mm_fault_error+0x380/0x380 [ 29.044299] ? __ia32_sys_exit+0x50/0x50 [ 29.048344] ? do_syscall_64+0x92/0x800 [ 29.052300] __x64_sys_exit_group+0x3e/0x50 [ 29.056603] do_syscall_64+0x1b1/0x800 [ 29.060472] ? syscall_return_slowpath+0x5c0/0x5c0 [ 29.065380] ? syscall_return_slowpath+0x30f/0x5c0 [ 29.070292] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 29.075635] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.080458] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.085632] RIP: 0033:0x43e8d8 [ 29.088800] RSP: 002b:00007ffdd460f568 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 29.096487] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 29.103733] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 29.110980] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 29.118227] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 29.125473] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 29.133329] Dumping ftrace buffer: [ 29.136939] (ftrace buffer empty) [ 29.140628] Kernel Offset: disabled [ 29.144238] Rebooting in 86400 seconds..