[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.721032] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.032879] random: sshd: uninitialized urandom read (32 bytes read) [ 17.250004] random: sshd: uninitialized urandom read (32 bytes read) [ 18.110736] random: sshd: uninitialized urandom read (32 bytes read) [ 34.447660] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.6' (ECDSA) to the list of known hosts. [ 39.817460] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 40.029012] ------------[ cut here ]------------ [ 40.033846] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 40.042353] Kernel panic - not syncing: panic_on_warn set ... [ 40.042353] [ 40.049709] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.116-g0137ea2 #18 [ 40.056712] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.066056] ffff8801db207cc0 ffffffff81eb46a9 ffffffff83c48980 00000000ffffffff [ 40.074073] 0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80 [ 40.082060] ffffffff81421a75 0000000041b58ab3 ffffffff843bbff8 ffffffff814218b6 [ 40.090238] Call Trace: [ 40.092794] [ 40.094831] [] dump_stack+0xc1/0x128 [ 40.100196] [] panic+0x1bf/0x3bc [ 40.105186] [] ? add_taint.cold.6+0x16/0x16 [ 40.111129] [] ? __warn.cold.9+0xa6/0x17f [ 40.116910] [] ? inet_sock_destruct+0x598/0x760 [ 40.123216] [] __warn.cold.9+0xc1/0x17f [ 40.128815] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 40.135297] [] warn_slowpath_null+0x2c/0x40 [ 40.141240] [] inet_sock_destruct+0x598/0x760 [ 40.147357] [] ? ipv4_mib_init_net+0x570/0x570 [ 40.153570] [] l2tp_tunnel_destruct+0x339/0x590 [ 40.159859] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 40.166328] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 40.172831] [] __sk_destruct+0x55/0x590 [ 40.178427] [] rcu_process_callbacks+0x8ae/0x12b0 [ 40.184888] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 40.191524] [] ? sock_set_timeout+0x210/0x210 [ 40.197640] [] __do_softirq+0x20b/0x937 [ 40.203235] [] irq_exit+0x147/0x190 [ 40.208492] [] smp_apic_timer_interrupt+0x81/0xa0 [ 40.214954] [] apic_timer_interrupt+0xa0/0xb0 [ 40.221079] [ 40.223120] [] ? native_safe_halt+0x6/0x10 [ 40.229003] [] default_idle+0x55/0x360 [ 40.234513] [] arch_cpu_idle+0x10/0x20 [ 40.240024] [] default_idle_call+0x45/0x60 [ 40.245881] [] cpu_startup_entry+0x2b5/0x380 [ 40.251920] [] ? cpu_in_idle+0x20/0x20 [ 40.257431] [] rest_init+0x183/0x189 [ 40.262771] [] start_kernel+0x67e/0x6b2 [ 40.268370] [] ? thread_stack_cache_init+0xb/0xb [ 40.274748] [] ? x86_family+0x32/0x40 [ 40.280183] [] ? early_idt_handler_array+0x120/0x120 [ 40.286909] [] x86_64_start_reservations+0x29/0x2b [ 40.293461] [] x86_64_start_kernel+0x13f/0x162 [ 40.300100] Dumping ftrace buffer: [ 40.303648] (ftrace buffer empty) [ 40.307344] Kernel Offset: disabled [ 40.310960] Rebooting in 86400 seconds..