[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.433444] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.273610] random: sshd: uninitialized urandom read (32 bytes read) [ 22.678517] random: sshd: uninitialized urandom read (32 bytes read) [ 23.446574] random: sshd: uninitialized urandom read (32 bytes read) [ 23.599229] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.31' (ECDSA) to the list of known hosts. [ 29.097350] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.189583] WARNING: CPU: 1 PID: 4501 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.197967] Kernel panic - not syncing: panic_on_warn set ... [ 29.197967] [ 29.205312] CPU: 1 PID: 4501 Comm: syz-executor160 Not tainted 4.17.0-rc3+ #34 [ 29.212648] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.222158] Call Trace: [ 29.224733] dump_stack+0x1b9/0x294 [ 29.228341] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.233512] ? smc_unhash_sk+0x310/0x4a0 [ 29.237552] panic+0x22f/0x4de [ 29.240722] ? add_taint.cold.5+0x16/0x16 [ 29.244854] ? __warn.cold.8+0x148/0x1b3 [ 29.248901] ? __warn.cold.8+0x117/0x1b3 [ 29.252942] ? smc_unhash_sk+0x345/0x4a0 [ 29.256982] __warn.cold.8+0x163/0x1b3 [ 29.260851] ? smc_unhash_sk+0x345/0x4a0 [ 29.264892] report_bug+0x252/0x2d0 [ 29.268506] do_error_trap+0x1de/0x490 [ 29.272384] ? graph_lock+0x170/0x170 [ 29.276165] ? math_error+0x420/0x420 [ 29.279947] ? lock_acquire+0x1dc/0x520 [ 29.283902] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.288724] do_invalid_op+0x1b/0x20 [ 29.292418] invalid_op+0x14/0x20 [ 29.295854] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 29.300523] RSP: 0018:ffff8801c72bf488 EFLAGS: 00010293 [ 29.305867] RAX: ffff8801ad35c740 RBX: ffff8801ad3c67c0 RCX: ffffffff87402b7e [ 29.313115] RDX: 0000000000000000 RSI: ffffffff87402c35 RDI: 0000000000000005 [ 29.320364] RBP: ffff8801c72bf570 R08: ffff8801ad35c740 R09: ffffed0035a78d08 [ 29.327612] R10: ffffed0035a78d08 R11: ffff8801ad3c6843 R12: 1ffff10038e57e95 [ 29.334871] R13: ffff8801c72bf548 R14: ffffffff8970e8a0 R15: ffff8801ad3c6840 [ 29.342128] ? smc_unhash_sk+0x28e/0x4a0 [ 29.346165] ? smc_unhash_sk+0x345/0x4a0 [ 29.350212] ? smc_unhash_sk+0x345/0x4a0 [ 29.354254] ? smc_rx_data_available+0x100/0x100 [ 29.358995] ? release_sock+0x1e2/0x2b0 [ 29.362953] ? __local_bh_enable_ip+0x161/0x230 [ 29.367611] ? __release_sock+0x3a0/0x3a0 [ 29.371760] ? smc_release+0x269/0x610 [ 29.375634] ? trace_hardirqs_on+0xd/0x10 [ 29.379760] ? __local_bh_enable_ip+0x161/0x230 [ 29.384418] smc_release+0x36e/0x610 [ 29.388112] sock_release+0x96/0x1b0 [ 29.391806] ? sock_alloc_file+0x4e0/0x4e0 [ 29.396027] sock_close+0x16/0x20 [ 29.399464] __fput+0x34d/0x890 [ 29.402726] ? fput+0x1a0/0x1a0 [ 29.405984] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.410470] ____fput+0x15/0x20 [ 29.413749] task_work_run+0x1e4/0x290 [ 29.417623] ? task_work_cancel+0x240/0x240 [ 29.421929] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.427455] ? switch_task_namespaces+0xa2/0xd0 [ 29.432121] do_exit+0x1aee/0x2730 [ 29.435656] ? mm_update_next_owner+0x980/0x980 [ 29.440652] ? lock_downgrade+0x8e0/0x8e0 [ 29.444778] ? noop_count+0x40/0x40 [ 29.448394] ? lock_pin_lock+0x350/0x350 [ 29.452445] ? kasan_check_read+0x11/0x20 [ 29.456584] ? rcu_is_watching+0x85/0x140 [ 29.460888] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 29.466061] ? is_bpf_text_address+0xd7/0x170 [ 29.470558] ? check_usage_backwards+0x151/0x3a0 [ 29.475304] ? graph_lock+0x170/0x170 [ 29.479089] ? graph_lock+0x170/0x170 [ 29.482878] ? find_held_lock+0x36/0x1c0 [ 29.486925] ? lock_downgrade+0x8e0/0x8e0 [ 29.491067] ? kasan_check_read+0x11/0x20 [ 29.495198] ? do_raw_spin_unlock+0x9e/0x2e0 [ 29.499601] ? __local_bh_enable_ip+0x161/0x230 [ 29.504262] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.509865] ? release_sock+0x1e2/0x2b0 [ 29.513814] ? trace_hardirqs_on+0xd/0x10 [ 29.517946] ? __local_bh_enable_ip+0x161/0x230 [ 29.522607] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.526994] ? release_sock+0x1e2/0x2b0 [ 29.531119] ? __release_sock+0x3a0/0x3a0 [ 29.535245] ? __local_bh_enable_ip+0x161/0x230 [ 29.539916] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 29.545089] ? smc_setsockopt+0x1ed/0x630 [ 29.549218] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.554732] ? __sys_setsockopt+0x24f/0x390 [ 29.559036] do_group_exit+0x16f/0x430 [ 29.562917] ? mm_fault_error+0x380/0x380 [ 29.567046] ? __ia32_sys_exit+0x50/0x50 [ 29.571099] ? do_syscall_64+0x92/0x800 [ 29.575054] __x64_sys_exit_group+0x3e/0x50 [ 29.579365] do_syscall_64+0x1b1/0x800 [ 29.583237] ? syscall_return_slowpath+0x5c0/0x5c0 [ 29.588159] ? syscall_return_slowpath+0x30f/0x5c0 [ 29.593069] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 29.598413] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.603236] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.608405] RIP: 0033:0x43e8d8 [ 29.611581] RSP: 002b:00007fff6f0e7648 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 29.619268] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 29.626526] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 29.633772] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 29.641022] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 29.648268] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 29.656071] Dumping ftrace buffer: [ 29.659663] (ftrace buffer empty) [ 29.663353] Kernel Offset: disabled [ 29.666962] Rebooting in 86400 seconds..