[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.052665] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.742910] random: sshd: uninitialized urandom read (32 bytes read) [ 25.174171] random: sshd: uninitialized urandom read (32 bytes read) [ 25.906184] random: sshd: uninitialized urandom read (32 bytes read) [ 26.063207] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.39' (ECDSA) to the list of known hosts. [ 31.598480] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.691259] WARNING: CPU: 1 PID: 4515 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.699663] Kernel panic - not syncing: panic_on_warn set ... [ 31.699663] [ 31.707031] CPU: 1 PID: 4515 Comm: syz-executor534 Not tainted 4.17.0-rc3+ #37 [ 31.714397] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.723757] Call Trace: [ 31.726350] dump_stack+0x1b9/0x294 [ 31.729966] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.735163] ? smc_unhash_sk+0x320/0x4a0 [ 31.739218] panic+0x22f/0x4de [ 31.742394] ? add_taint.cold.5+0x16/0x16 [ 31.746542] ? __warn.cold.8+0x148/0x1b3 [ 31.750582] ? __warn.cold.8+0x117/0x1b3 [ 31.754624] ? smc_unhash_sk+0x345/0x4a0 [ 31.758666] __warn.cold.8+0x163/0x1b3 [ 31.762541] ? smc_unhash_sk+0x345/0x4a0 [ 31.766584] report_bug+0x252/0x2d0 [ 31.770197] do_error_trap+0x1de/0x490 [ 31.774067] ? graph_lock+0x170/0x170 [ 31.777849] ? math_error+0x420/0x420 [ 31.781637] ? lock_acquire+0x1dc/0x520 [ 31.785593] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.790424] do_invalid_op+0x1b/0x20 [ 31.794121] invalid_op+0x14/0x20 [ 31.797556] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.802232] RSP: 0018:ffff8801cf26f488 EFLAGS: 00010293 [ 31.807578] RAX: ffff8801acfc8540 RBX: ffff8801acfcb7c0 RCX: ffffffff873f756e [ 31.814829] RDX: 0000000000000000 RSI: ffffffff873f7625 RDI: 0000000000000005 [ 31.822096] RBP: ffff8801cf26f570 R08: ffff8801acfc8540 R09: ffffed00359f9708 [ 31.829347] R10: ffffed00359f9708 R11: ffff8801acfcb843 R12: 1ffff10039e4de95 [ 31.836597] R13: ffff8801cf26f548 R14: ffffffff8970b1e0 R15: ffff8801acfcb840 [ 31.843859] ? smc_unhash_sk+0x28e/0x4a0 [ 31.847909] ? smc_unhash_sk+0x345/0x4a0 [ 31.851955] ? smc_unhash_sk+0x345/0x4a0 [ 31.856003] ? smc_rx_data_available+0x100/0x100 [ 31.860752] ? release_sock+0x1e2/0x2b0 [ 31.864710] ? __local_bh_enable_ip+0x161/0x230 [ 31.869365] ? __release_sock+0x3a0/0x3a0 [ 31.873495] ? smc_release+0x269/0x610 [ 31.877362] ? trace_hardirqs_on+0xd/0x10 [ 31.881491] ? __local_bh_enable_ip+0x161/0x230 [ 31.886143] smc_release+0x36e/0x610 [ 31.889843] sock_release+0x96/0x1b0 [ 31.893541] ? sock_alloc_file+0x4e0/0x4e0 [ 31.897761] sock_close+0x16/0x20 [ 31.901200] __fput+0x34d/0x890 [ 31.904463] ? fput+0x1a0/0x1a0 [ 31.907725] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.912203] ____fput+0x15/0x20 [ 31.915474] task_work_run+0x1e4/0x290 [ 31.919352] ? task_work_cancel+0x240/0x240 [ 31.923666] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.929192] ? switch_task_namespaces+0xa2/0xd0 [ 31.933844] do_exit+0x1aee/0x2730 [ 31.937368] ? mm_update_next_owner+0x980/0x980 [ 31.942039] ? ___sys_sendmsg+0x31a/0x940 [ 31.946171] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.951171] ? kfree+0x1e9/0x260 [ 31.954522] ? ___sys_sendmsg+0x31f/0x940 [ 31.958660] ? copy_msghdr_from_user+0x560/0x560 [ 31.963406] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.968409] ? graph_lock+0x170/0x170 [ 31.972200] ? pud_val+0x80/0xf0 [ 31.975556] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.981094] ? __fget_light+0x2ef/0x430 [ 31.985051] ? __handle_mm_fault+0x93a/0x4310 [ 31.989528] ? fget_raw+0x20/0x20 [ 31.992967] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 31.997705] ? graph_lock+0x170/0x170 [ 32.001498] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.007027] ? sockfd_lookup_light+0xc5/0x160 [ 32.011515] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.017039] ? __sys_sendmmsg+0x4b3/0x6f0 [ 32.021173] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 32.025478] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.031007] ? __handle_mm_fault+0x4310/0x4310 [ 32.035593] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.041121] ? __do_page_fault+0x441/0xe40 [ 32.045350] do_group_exit+0x16f/0x430 [ 32.049219] ? mm_fault_error+0x380/0x380 [ 32.053356] ? __ia32_sys_exit+0x50/0x50 [ 32.057405] ? do_syscall_64+0x92/0x800 [ 32.061375] __x64_sys_exit_group+0x3e/0x50 [ 32.065682] do_syscall_64+0x1b1/0x800 [ 32.069571] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.074498] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.079424] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.084780] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.089614] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.094783] RIP: 0033:0x43ec78 [ 32.097954] RSP: 002b:00007ffd2af5e358 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.105644] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ec78 [ 32.112893] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.120145] RBP: 00000000004be620 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.127395] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 32.134662] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.142588] Dumping ftrace buffer: [ 32.146272] (ftrace buffer empty) [ 32.149964] Kernel Offset: disabled [ 32.153575] Rebooting in 86400 seconds..