[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.301298] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.635633] random: sshd: uninitialized urandom read (32 bytes read) [ 21.889238] random: sshd: uninitialized urandom read (32 bytes read) [ 22.678375] random: sshd: uninitialized urandom read (32 bytes read) [ 39.537063] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.35' (ECDSA) to the list of known hosts. [ 44.947680] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 45.037213] WARNING: CPU: 1 PID: 4451 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 45.045601] Kernel panic - not syncing: panic_on_warn set ... [ 45.045601] [ 45.052952] CPU: 1 PID: 4451 Comm: syz-executor600 Not tainted 4.17.0-rc4+ #41 [ 45.060290] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.069620] Call Trace: [ 45.072193] dump_stack+0x1b9/0x294 [ 45.075803] ? dump_stack_print_info.cold.2+0x52/0x52 [ 45.080977] ? smc_unhash_sk+0x2d0/0x4a0 [ 45.085021] panic+0x22f/0x4de [ 45.088205] ? add_taint.cold.5+0x16/0x16 [ 45.092336] ? __warn.cold.8+0x148/0x1b3 [ 45.096376] ? __warn.cold.8+0x117/0x1b3 [ 45.100418] ? smc_unhash_sk+0x345/0x4a0 [ 45.104469] __warn.cold.8+0x163/0x1b3 [ 45.108344] ? smc_unhash_sk+0x345/0x4a0 [ 45.112401] report_bug+0x252/0x2d0 [ 45.116013] do_error_trap+0x1de/0x490 [ 45.119883] ? graph_lock+0x170/0x170 [ 45.123669] ? math_error+0x420/0x420 [ 45.127476] ? lock_acquire+0x1dc/0x520 [ 45.131441] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.136268] do_invalid_op+0x1b/0x20 [ 45.140050] invalid_op+0x14/0x20 [ 45.143486] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 45.148132] RSP: 0018:ffff8801c3e57488 EFLAGS: 00010293 [ 45.153478] RAX: ffff8801b64a0200 RBX: ffff8801b50587c0 RCX: ffffffff87404cbe [ 45.160814] RDX: 0000000000000000 RSI: ffffffff87404d75 RDI: 0000000000000005 [ 45.168075] RBP: ffff8801c3e57570 R08: ffff8801b64a0200 R09: ffffed0036a0b108 [ 45.175327] R10: ffffed0036a0b108 R11: ffff8801b5058843 R12: 1ffff100387cae95 [ 45.182579] R13: ffff8801c3e57548 R14: ffffffff8970cc20 R15: ffff8801b5058840 [ 45.189842] ? smc_unhash_sk+0x28e/0x4a0 [ 45.193896] ? smc_unhash_sk+0x345/0x4a0 [ 45.197977] ? smc_unhash_sk+0x345/0x4a0 [ 45.202030] ? smc_rx_data_available+0x100/0x100 [ 45.206774] ? release_sock+0x1e2/0x2b0 [ 45.210734] ? __local_bh_enable_ip+0x161/0x230 [ 45.215407] ? __release_sock+0x3a0/0x3a0 [ 45.219536] ? smc_release+0x269/0x610 [ 45.223405] ? trace_hardirqs_on+0xd/0x10 [ 45.227536] ? __local_bh_enable_ip+0x161/0x230 [ 45.232188] smc_release+0x36e/0x610 [ 45.235886] sock_release+0x96/0x1b0 [ 45.239588] ? sock_alloc_file+0x4e0/0x4e0 [ 45.243803] sock_close+0x16/0x20 [ 45.247236] __fput+0x34d/0x890 [ 45.250497] ? fput+0x1a0/0x1a0 [ 45.253757] ? _raw_spin_unlock_irq+0x27/0x70 [ 45.258232] ____fput+0x15/0x20 [ 45.261502] task_work_run+0x1e4/0x290 [ 45.265371] ? task_work_cancel+0x240/0x240 [ 45.269677] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 45.275191] ? switch_task_namespaces+0xa2/0xd0 [ 45.279852] do_exit+0x1aee/0x2730 [ 45.283377] ? mm_update_next_owner+0x980/0x980 [ 45.288025] ? lock_downgrade+0x8e0/0x8e0 [ 45.292153] ? noop_count+0x40/0x40 [ 45.295760] ? lock_pin_lock+0x350/0x350 [ 45.299809] ? kasan_check_read+0x11/0x20 [ 45.303956] ? rcu_is_watching+0x85/0x140 [ 45.308084] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 45.313250] ? print_usage_bug+0xc0/0xc0 [ 45.317292] ? is_bpf_text_address+0xd7/0x170 [ 45.321769] ? check_usage_backwards+0x151/0x3a0 [ 45.326598] ? graph_lock+0x170/0x170 [ 45.330388] ? graph_lock+0x170/0x170 [ 45.334182] ? find_held_lock+0x36/0x1c0 [ 45.338227] ? lock_downgrade+0x8e0/0x8e0 [ 45.342356] ? kasan_check_read+0x11/0x20 [ 45.346494] ? do_raw_spin_unlock+0x9e/0x2e0 [ 45.350884] ? __local_bh_enable_ip+0x161/0x230 [ 45.355538] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 45.360534] ? release_sock+0x1e2/0x2b0 [ 45.364489] ? trace_hardirqs_on+0xd/0x10 [ 45.368617] ? __local_bh_enable_ip+0x161/0x230 [ 45.373268] ? _raw_spin_unlock_bh+0x30/0x40 [ 45.377668] ? release_sock+0x1e2/0x2b0 [ 45.381621] ? __release_sock+0x3a0/0x3a0 [ 45.385749] ? __local_bh_enable_ip+0x161/0x230 [ 45.390401] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 45.395573] ? smc_setsockopt+0x1ed/0x630 [ 45.399712] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.405242] ? __sys_setsockopt+0x24f/0x390 [ 45.409548] do_group_exit+0x16f/0x430 [ 45.413419] ? mm_fault_error+0x380/0x380 [ 45.417545] ? __ia32_sys_exit+0x50/0x50 [ 45.421591] ? do_syscall_64+0x92/0x800 [ 45.425547] __x64_sys_exit_group+0x3e/0x50 [ 45.429849] do_syscall_64+0x1b1/0x800 [ 45.433718] ? syscall_return_slowpath+0x5c0/0x5c0 [ 45.438627] ? syscall_return_slowpath+0x30f/0x5c0 [ 45.443547] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 45.448905] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.453734] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.458905] RIP: 0033:0x43e8c8 [ 45.462073] RSP: 002b:00007fffc5656128 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 45.469761] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8c8 [ 45.477011] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 45.484269] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 45.491520] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 45.499004] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 45.506781] Dumping ftrace buffer: [ 45.510416] (ftrace buffer empty) [ 45.514110] Kernel Offset: disabled [ 45.517723] Rebooting in 86400 seconds..