[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.239142] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.669307] random: sshd: uninitialized urandom read (32 bytes read) [ 22.898965] random: sshd: uninitialized urandom read (32 bytes read) [ 23.674474] random: sshd: uninitialized urandom read (32 bytes read) [ 23.836720] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.19' (ECDSA) to the list of known hosts. [ 29.303738] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.394021] WARNING: CPU: 1 PID: 4508 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.402445] Kernel panic - not syncing: panic_on_warn set ... [ 29.402445] [ 29.409791] CPU: 1 PID: 4508 Comm: syz-executor516 Not tainted 4.17.0-rc6+ #63 [ 29.417127] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.426459] Call Trace: [ 29.429043] dump_stack+0x1b9/0x294 [ 29.432665] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.437840] ? smc_unhash_sk+0x290/0x4a0 [ 29.441884] panic+0x22f/0x4de [ 29.445067] ? add_taint.cold.5+0x16/0x16 [ 29.449198] ? __warn.cold.8+0x148/0x1b3 [ 29.453237] ? __warn.cold.8+0x117/0x1b3 [ 29.457277] ? smc_unhash_sk+0x345/0x4a0 [ 29.461327] __warn.cold.8+0x163/0x1b3 [ 29.465198] ? smc_unhash_sk+0x345/0x4a0 [ 29.469241] report_bug+0x252/0x2d0 [ 29.472856] do_error_trap+0x1de/0x490 [ 29.476729] ? graph_lock+0x170/0x170 [ 29.480512] ? math_error+0x420/0x420 [ 29.484295] ? lock_acquire+0x1dc/0x520 [ 29.488254] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.493080] do_invalid_op+0x1b/0x20 [ 29.496780] invalid_op+0x14/0x20 [ 29.500213] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 29.504856] RSP: 0018:ffff8801ac56f488 EFLAGS: 00010293 [ 29.510199] RAX: ffff8801acd045c0 RBX: ffff8801acd4c7c0 RCX: ffffffff87427cfe [ 29.517457] RDX: 0000000000000000 RSI: ffffffff87427db5 RDI: 0000000000000005 [ 29.524725] RBP: ffff8801ac56f570 R08: ffff8801acd045c0 R09: ffffed00359a9908 [ 29.531979] R10: ffffed00359a9908 R11: ffff8801acd4c843 R12: 1ffff100358ade95 [ 29.539240] R13: ffff8801ac56f548 R14: ffffffff8970ea60 R15: ffff8801acd4c840 [ 29.546504] ? smc_unhash_sk+0x28e/0x4a0 [ 29.550547] ? smc_unhash_sk+0x345/0x4a0 [ 29.554589] ? smc_unhash_sk+0x345/0x4a0 [ 29.558634] ? smc_rx_data_available+0x100/0x100 [ 29.563370] ? release_sock+0x1e2/0x2b0 [ 29.567325] ? __local_bh_enable_ip+0x161/0x230 [ 29.571975] ? __release_sock+0x3a0/0x3a0 [ 29.576106] ? smc_release+0x269/0x610 [ 29.579974] ? trace_hardirqs_on+0xd/0x10 [ 29.584105] ? __local_bh_enable_ip+0x161/0x230 [ 29.588755] smc_release+0x36e/0x610 [ 29.592449] sock_release+0x96/0x1b0 [ 29.596142] ? sock_alloc_file+0x4e0/0x4e0 [ 29.600358] sock_close+0x16/0x20 [ 29.603791] __fput+0x34d/0x890 [ 29.607054] ? fput+0x1a0/0x1a0 [ 29.610314] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.614801] ____fput+0x15/0x20 [ 29.618064] task_work_run+0x1e4/0x290 [ 29.621933] ? task_work_cancel+0x240/0x240 [ 29.626239] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.631756] ? switch_task_namespaces+0xa2/0xd0 [ 29.636425] do_exit+0x1aee/0x2730 [ 29.639951] ? mm_update_next_owner+0x980/0x980 [ 29.644614] ? lock_downgrade+0x8e0/0x8e0 [ 29.648740] ? noop_count+0x40/0x40 [ 29.652353] ? lock_pin_lock+0x350/0x350 [ 29.656395] ? kasan_check_read+0x11/0x20 [ 29.660523] ? rcu_is_watching+0x85/0x140 [ 29.664657] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 29.669836] ? is_bpf_text_address+0xd7/0x170 [ 29.674316] ? check_usage_backwards+0x151/0x3a0 [ 29.679058] ? graph_lock+0x170/0x170 [ 29.682847] ? graph_lock+0x170/0x170 [ 29.686631] ? find_held_lock+0x36/0x1c0 [ 29.690677] ? lock_downgrade+0x8e0/0x8e0 [ 29.694815] ? kasan_check_read+0x11/0x20 [ 29.698946] ? do_raw_spin_unlock+0x9e/0x2e0 [ 29.703337] ? __local_bh_enable_ip+0x161/0x230 [ 29.707985] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.712987] ? release_sock+0x1e2/0x2b0 [ 29.716961] ? trace_hardirqs_on+0xd/0x10 [ 29.721089] ? __local_bh_enable_ip+0x161/0x230 [ 29.725754] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.730154] ? release_sock+0x1e2/0x2b0 [ 29.734113] ? __release_sock+0x3a0/0x3a0 [ 29.738242] ? __local_bh_enable_ip+0x161/0x230 [ 29.742894] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 29.748067] ? smc_setsockopt+0x1ed/0x6d0 [ 29.752197] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.757718] ? __sys_setsockopt+0x24f/0x390 [ 29.762040] do_group_exit+0x16f/0x430 [ 29.765908] ? mm_fault_error+0x380/0x380 [ 29.770046] ? __ia32_sys_exit+0x50/0x50 [ 29.774093] ? do_syscall_64+0x92/0x800 [ 29.778051] __x64_sys_exit_group+0x3e/0x50 [ 29.782359] do_syscall_64+0x1b1/0x800 [ 29.786227] ? syscall_return_slowpath+0x5c0/0x5c0 [ 29.791135] ? syscall_return_slowpath+0x30f/0x5c0 [ 29.796051] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 29.801396] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.806226] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.811402] RIP: 0033:0x43e8d8 [ 29.814578] RSP: 002b:00007ffd0a5af828 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 29.822281] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 29.829528] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 29.836777] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 29.844037] R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000001 [ 29.851287] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 29.859211] Dumping ftrace buffer: [ 29.862840] (ftrace buffer empty) [ 29.866534] Kernel Offset: disabled [ 29.870144] Rebooting in 86400 seconds..