[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.460870] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.985458] random: sshd: uninitialized urandom read (32 bytes read) [ 24.175904] random: sshd: uninitialized urandom read (32 bytes read) [ 24.931264] random: sshd: uninitialized urandom read (32 bytes read) [ 25.100168] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.49' (ECDSA) to the list of known hosts. [ 30.554406] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.661718] WARNING: CPU: 0 PID: 4535 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 30.670122] Kernel panic - not syncing: panic_on_warn set ... [ 30.670122] [ 30.677481] CPU: 0 PID: 4535 Comm: syz-executor540 Not tainted 4.17.0-rc6+ #62 [ 30.684825] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.694165] Call Trace: [ 30.696752] dump_stack+0x1b9/0x294 [ 30.700369] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.705553] ? smc_unhash_sk+0x290/0x4a0 [ 30.709678] panic+0x22f/0x4de [ 30.712878] ? add_taint.cold.5+0x16/0x16 [ 30.717021] ? __warn.cold.8+0x148/0x1b3 [ 30.721079] ? __warn.cold.8+0x117/0x1b3 [ 30.725138] ? smc_unhash_sk+0x345/0x4a0 [ 30.729190] __warn.cold.8+0x163/0x1b3 [ 30.733071] ? smc_unhash_sk+0x345/0x4a0 [ 30.737124] report_bug+0x252/0x2d0 [ 30.740769] do_error_trap+0x1de/0x490 [ 30.744648] ? graph_lock+0x170/0x170 [ 30.748446] ? math_error+0x420/0x420 [ 30.752256] ? lock_acquire+0x1dc/0x520 [ 30.756222] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.761056] do_invalid_op+0x1b/0x20 [ 30.764759] invalid_op+0x14/0x20 [ 30.768198] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.772848] RSP: 0018:ffff8801b06d7488 EFLAGS: 00010293 [ 30.778199] RAX: ffff8801ad0dc780 RBX: ffff8801ad4f37c0 RCX: ffffffff87427cfe [ 30.785461] RDX: 0000000000000000 RSI: ffffffff87427db5 RDI: 0000000000000005 [ 30.792729] RBP: ffff8801b06d7570 R08: ffff8801ad0dc780 R09: ffffed0035a9e708 [ 30.799986] R10: ffffed0035a9e708 R11: ffff8801ad4f3843 R12: 1ffff100360dae95 [ 30.807246] R13: ffff8801b06d7548 R14: ffffffff8970ea20 R15: ffff8801ad4f3840 [ 30.814521] ? smc_unhash_sk+0x28e/0x4a0 [ 30.818572] ? smc_unhash_sk+0x345/0x4a0 [ 30.822625] ? smc_unhash_sk+0x345/0x4a0 [ 30.826679] ? smc_rx_data_available+0x100/0x100 [ 30.831428] ? release_sock+0x1e2/0x2b0 [ 30.835421] ? __local_bh_enable_ip+0x161/0x230 [ 30.840096] ? __release_sock+0x3a0/0x3a0 [ 30.844233] ? smc_release+0x269/0x610 [ 30.848109] ? trace_hardirqs_on+0xd/0x10 [ 30.852246] ? __local_bh_enable_ip+0x161/0x230 [ 30.856906] smc_release+0x36e/0x610 [ 30.860611] sock_release+0x96/0x1b0 [ 30.864319] ? sock_alloc_file+0x4e0/0x4e0 [ 30.868537] sock_close+0x16/0x20 [ 30.871993] __fput+0x34d/0x890 [ 30.875286] ? fput+0x1a0/0x1a0 [ 30.878558] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.883051] ____fput+0x15/0x20 [ 30.886340] task_work_run+0x1e4/0x290 [ 30.890217] ? task_work_cancel+0x240/0x240 [ 30.894538] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.900068] ? switch_task_namespaces+0xa2/0xd0 [ 30.904752] do_exit+0x1aee/0x2730 [ 30.908285] ? mm_update_next_owner+0x980/0x980 [ 30.912944] ? lock_downgrade+0x8e0/0x8e0 [ 30.917081] ? noop_count+0x40/0x40 [ 30.920697] ? lock_pin_lock+0x350/0x350 [ 30.924751] ? kasan_check_read+0x11/0x20 [ 30.928889] ? rcu_is_watching+0x85/0x140 [ 30.933044] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 30.938231] ? is_bpf_text_address+0xd7/0x170 [ 30.942718] ? check_usage_backwards+0x151/0x3a0 [ 30.947475] ? graph_lock+0x170/0x170 [ 30.951273] ? graph_lock+0x170/0x170 [ 30.955089] ? find_held_lock+0x36/0x1c0 [ 30.959147] ? lock_downgrade+0x8e0/0x8e0 [ 30.963310] ? kasan_check_read+0x11/0x20 [ 30.967458] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.971868] ? __local_bh_enable_ip+0x161/0x230 [ 30.976528] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.981543] ? release_sock+0x1e2/0x2b0 [ 30.985507] ? trace_hardirqs_on+0xd/0x10 [ 30.989645] ? __local_bh_enable_ip+0x161/0x230 [ 30.994305] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.998705] ? release_sock+0x1e2/0x2b0 [ 31.002671] ? __release_sock+0x3a0/0x3a0 [ 31.006810] ? __local_bh_enable_ip+0x161/0x230 [ 31.011473] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 31.016659] ? smc_setsockopt+0x1ed/0x6d0 [ 31.020814] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.026351] ? __sys_setsockopt+0x24f/0x390 [ 31.030665] do_group_exit+0x16f/0x430 [ 31.034549] ? mm_fault_error+0x380/0x380 [ 31.038688] ? __ia32_sys_exit+0x50/0x50 [ 31.042747] ? do_syscall_64+0x92/0x800 [ 31.046713] __x64_sys_exit_group+0x3e/0x50 [ 31.051035] do_syscall_64+0x1b1/0x800 [ 31.055015] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.059950] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.064875] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.070237] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.075092] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.080275] RIP: 0033:0x43e8d8 [ 31.083463] RSP: 002b:00007fff8a684608 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.091165] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 31.098428] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.105682] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.112941] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 31.120199] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.128133] Dumping ftrace buffer: [ 31.131805] (ftrace buffer empty) [ 31.135501] Kernel Offset: disabled [ 31.139116] Rebooting in 86400 seconds..