[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.193177] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.847488] random: sshd: uninitialized urandom read (32 bytes read) [ 24.233622] random: sshd: uninitialized urandom read (32 bytes read) [ 24.992971] random: sshd: uninitialized urandom read (32 bytes read) [ 26.444629] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.40' (ECDSA) to the list of known hosts. [ 31.982401] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.085824] WARNING: CPU: 1 PID: 4496 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 32.094747] Kernel panic - not syncing: panic_on_warn set ... [ 32.094747] [ 32.102097] CPU: 1 PID: 4496 Comm: syz-executor120 Not tainted 4.17.0-rc3+ #37 [ 32.109438] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.118769] Call Trace: [ 32.121343] dump_stack+0x1b9/0x294 [ 32.124954] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.130135] ? smc_unhash_sk+0x320/0x4a0 [ 32.134177] panic+0x22f/0x4de [ 32.137350] ? add_taint.cold.5+0x16/0x16 [ 32.141480] ? __warn.cold.8+0x148/0x1b3 [ 32.145519] ? __warn.cold.8+0x117/0x1b3 [ 32.149561] ? smc_unhash_sk+0x345/0x4a0 [ 32.153605] __warn.cold.8+0x163/0x1b3 [ 32.157470] ? smc_unhash_sk+0x345/0x4a0 [ 32.161516] report_bug+0x252/0x2d0 [ 32.165128] do_error_trap+0x1de/0x490 [ 32.168995] ? graph_lock+0x170/0x170 [ 32.172955] ? math_error+0x420/0x420 [ 32.176739] ? lock_acquire+0x1dc/0x520 [ 32.180695] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.186048] do_invalid_op+0x1b/0x20 [ 32.189747] invalid_op+0x14/0x20 [ 32.193184] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 32.197836] RSP: 0018:ffff8801ac7df488 EFLAGS: 00010293 [ 32.203190] RAX: ffff8801adf38240 RBX: ffff8801d8cfc7c0 RCX: ffffffff873f756e [ 32.210439] RDX: 0000000000000000 RSI: ffffffff873f7625 RDI: 0000000000000005 [ 32.217690] RBP: ffff8801ac7df570 R08: ffff8801adf38240 R09: ffffed003b19f908 [ 32.224951] R10: ffffed003b19f908 R11: ffff8801d8cfc843 R12: 1ffff100358fbe95 [ 32.232211] R13: ffff8801ac7df548 R14: ffffffff8970b1e0 R15: ffff8801d8cfc840 [ 32.239484] ? smc_unhash_sk+0x28e/0x4a0 [ 32.243536] ? smc_unhash_sk+0x345/0x4a0 [ 32.247586] ? smc_unhash_sk+0x345/0x4a0 [ 32.251628] ? smc_rx_data_available+0x100/0x100 [ 32.256365] ? release_sock+0x1e2/0x2b0 [ 32.260319] ? __local_bh_enable_ip+0x161/0x230 [ 32.264966] ? __release_sock+0x3a0/0x3a0 [ 32.269102] ? smc_release+0x269/0x610 [ 32.272967] ? trace_hardirqs_on+0xd/0x10 [ 32.277096] ? __local_bh_enable_ip+0x161/0x230 [ 32.281745] smc_release+0x36e/0x610 [ 32.285445] sock_release+0x96/0x1b0 [ 32.289141] ? sock_alloc_file+0x4e0/0x4e0 [ 32.293354] sock_close+0x16/0x20 [ 32.296784] __fput+0x34d/0x890 [ 32.300049] ? fput+0x1a0/0x1a0 [ 32.303312] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.307796] ____fput+0x15/0x20 [ 32.311062] task_work_run+0x1e4/0x290 [ 32.314934] ? task_work_cancel+0x240/0x240 [ 32.319238] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.324753] ? switch_task_namespaces+0xa2/0xd0 [ 32.329406] do_exit+0x1aee/0x2730 [ 32.332930] ? mm_update_next_owner+0x980/0x980 [ 32.337580] ? lock_downgrade+0x8e0/0x8e0 [ 32.341705] ? noop_count+0x40/0x40 [ 32.345318] ? lock_pin_lock+0x350/0x350 [ 32.349364] ? kasan_check_read+0x11/0x20 [ 32.353491] ? rcu_is_watching+0x85/0x140 [ 32.357619] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 32.362792] ? is_bpf_text_address+0xd7/0x170 [ 32.367269] ? check_usage_backwards+0x151/0x3a0 [ 32.372008] ? graph_lock+0x170/0x170 [ 32.375798] ? graph_lock+0x170/0x170 [ 32.379583] ? find_held_lock+0x36/0x1c0 [ 32.383632] ? lock_downgrade+0x8e0/0x8e0 [ 32.387765] ? kasan_check_read+0x11/0x20 [ 32.391894] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.396282] ? __local_bh_enable_ip+0x161/0x230 [ 32.400930] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.405930] ? release_sock+0x1e2/0x2b0 [ 32.409885] ? trace_hardirqs_on+0xd/0x10 [ 32.414017] ? __local_bh_enable_ip+0x161/0x230 [ 32.418677] ? _raw_spin_unlock_bh+0x30/0x40 [ 32.423067] ? release_sock+0x1e2/0x2b0 [ 32.427030] ? __release_sock+0x3a0/0x3a0 [ 32.431170] ? __local_bh_enable_ip+0x161/0x230 [ 32.435821] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 32.440997] ? smc_setsockopt+0x1ed/0x630 [ 32.445133] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.450653] ? __sys_setsockopt+0x24f/0x390 [ 32.454960] do_group_exit+0x16f/0x430 [ 32.458828] ? mm_fault_error+0x380/0x380 [ 32.462968] ? __ia32_sys_exit+0x50/0x50 [ 32.467018] ? do_syscall_64+0x92/0x800 [ 32.470986] __x64_sys_exit_group+0x3e/0x50 [ 32.475293] do_syscall_64+0x1b1/0x800 [ 32.479166] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.484083] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.488998] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.494354] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.499178] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.504346] RIP: 0033:0x43e8d8 [ 32.507513] RSP: 002b:00007fffcfe117c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.515200] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 32.522450] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.529698] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.536948] R10: 0000000020000100 R11: 0000000000000246 R12: 0000000000000001 [ 32.544196] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.552059] Dumping ftrace buffer: [ 32.555683] (ftrace buffer empty) [ 32.559374] Kernel Offset: disabled [ 32.562982] Rebooting in 86400 seconds..