[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.772222] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.048163] random: sshd: uninitialized urandom read (32 bytes read) [ 25.411127] random: sshd: uninitialized urandom read (32 bytes read) [ 26.131583] random: sshd: uninitialized urandom read (32 bytes read) [ 26.292523] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.11' (ECDSA) to the list of known hosts. [ 31.889666] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.983877] WARNING: CPU: 1 PID: 4531 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.992272] Kernel panic - not syncing: panic_on_warn set ... [ 31.992272] [ 31.999622] CPU: 1 PID: 4531 Comm: syz-executor608 Not tainted 4.17.0-rc3+ #34 [ 32.006967] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.016307] Call Trace: [ 32.018884] dump_stack+0x1b9/0x294 [ 32.022496] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.027679] ? smc_unhash_sk+0x310/0x4a0 [ 32.031725] panic+0x22f/0x4de [ 32.034901] ? add_taint.cold.5+0x16/0x16 [ 32.039035] ? __warn.cold.8+0x148/0x1b3 [ 32.043081] ? __warn.cold.8+0x117/0x1b3 [ 32.047129] ? smc_unhash_sk+0x345/0x4a0 [ 32.051176] __warn.cold.8+0x163/0x1b3 [ 32.055058] ? smc_unhash_sk+0x345/0x4a0 [ 32.059104] report_bug+0x252/0x2d0 [ 32.062722] do_error_trap+0x1de/0x490 [ 32.066589] ? graph_lock+0x170/0x170 [ 32.070374] ? math_error+0x420/0x420 [ 32.074158] ? lock_acquire+0x1dc/0x520 [ 32.078119] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.082948] do_invalid_op+0x1b/0x20 [ 32.086651] invalid_op+0x14/0x20 [ 32.090084] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 32.094729] RSP: 0018:ffff8801ac73f488 EFLAGS: 00010293 [ 32.100071] RAX: ffff8801d8db8180 RBX: ffff8801d9b6f7c0 RCX: ffffffff87402b7e [ 32.107323] RDX: 0000000000000000 RSI: ffffffff87402c35 RDI: 0000000000000005 [ 32.114576] RBP: ffff8801ac73f570 R08: ffff8801d8db8180 R09: ffffed003b36df08 [ 32.121828] R10: ffffed003b36df08 R11: ffff8801d9b6f843 R12: 1ffff100358e7e95 [ 32.129084] R13: ffff8801ac73f548 R14: ffffffff8970e8a0 R15: ffff8801d9b6f840 [ 32.136352] ? smc_unhash_sk+0x28e/0x4a0 [ 32.140399] ? smc_unhash_sk+0x345/0x4a0 [ 32.144444] ? smc_unhash_sk+0x345/0x4a0 [ 32.148491] ? smc_rx_data_available+0x100/0x100 [ 32.153234] ? release_sock+0x1e2/0x2b0 [ 32.157191] ? __local_bh_enable_ip+0x161/0x230 [ 32.161842] ? __release_sock+0x3a0/0x3a0 [ 32.165977] ? smc_release+0x269/0x610 [ 32.169857] ? trace_hardirqs_on+0xd/0x10 [ 32.173988] ? __local_bh_enable_ip+0x161/0x230 [ 32.178643] smc_release+0x36e/0x610 [ 32.182350] sock_release+0x96/0x1b0 [ 32.186052] ? sock_alloc_file+0x4e0/0x4e0 [ 32.190284] sock_close+0x16/0x20 [ 32.193737] __fput+0x34d/0x890 [ 32.197007] ? fput+0x1a0/0x1a0 [ 32.200279] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.204769] ____fput+0x15/0x20 [ 32.208032] task_work_run+0x1e4/0x290 [ 32.211911] ? task_work_cancel+0x240/0x240 [ 32.216226] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.221747] ? switch_task_namespaces+0xa2/0xd0 [ 32.226398] do_exit+0x1aee/0x2730 [ 32.229928] ? mm_update_next_owner+0x980/0x980 [ 32.234578] ? lock_downgrade+0x8e0/0x8e0 [ 32.238707] ? noop_count+0x40/0x40 [ 32.242313] ? lock_pin_lock+0x350/0x350 [ 32.246358] ? kasan_check_read+0x11/0x20 [ 32.250489] ? rcu_is_watching+0x85/0x140 [ 32.254627] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 32.259803] ? is_bpf_text_address+0xd7/0x170 [ 32.264287] ? check_usage_backwards+0x151/0x3a0 [ 32.269032] ? graph_lock+0x170/0x170 [ 32.272821] ? graph_lock+0x170/0x170 [ 32.276607] ? find_held_lock+0x36/0x1c0 [ 32.280654] ? lock_downgrade+0x8e0/0x8e0 [ 32.284788] ? kasan_check_read+0x11/0x20 [ 32.288921] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.293312] ? __local_bh_enable_ip+0x161/0x230 [ 32.297960] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.302960] ? release_sock+0x1e2/0x2b0 [ 32.306916] ? trace_hardirqs_on+0xd/0x10 [ 32.311049] ? __local_bh_enable_ip+0x161/0x230 [ 32.315703] ? _raw_spin_unlock_bh+0x30/0x40 [ 32.320098] ? release_sock+0x1e2/0x2b0 [ 32.324053] ? __release_sock+0x3a0/0x3a0 [ 32.328192] ? __local_bh_enable_ip+0x161/0x230 [ 32.332844] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 32.338017] ? smc_setsockopt+0x1ed/0x630 [ 32.342152] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.347669] ? __sys_setsockopt+0x24f/0x390 [ 32.351976] do_group_exit+0x16f/0x430 [ 32.355844] ? mm_fault_error+0x380/0x380 [ 32.359991] ? __ia32_sys_exit+0x50/0x50 [ 32.364037] ? do_syscall_64+0x92/0x800 [ 32.367996] __x64_sys_exit_group+0x3e/0x50 [ 32.372305] do_syscall_64+0x1b1/0x800 [ 32.376181] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 32.381009] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.385938] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.390854] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.396216] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.401058] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.406236] RIP: 0033:0x43e8d8 [ 32.409410] RSP: 002b:00007ffcf00e42e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.417105] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 32.424373] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.431627] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.438878] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 32.446137] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.453989] Dumping ftrace buffer: [ 32.457618] (ftrace buffer empty) [ 32.461309] Kernel Offset: disabled [ 32.464921] Rebooting in 86400 seconds..