[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.721528] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.715398] random: sshd: uninitialized urandom read (32 bytes read) [ 22.003822] random: sshd: uninitialized urandom read (32 bytes read) [ 22.458983] random: sshd: uninitialized urandom read (32 bytes read) [ 39.109872] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.4' (ECDSA) to the list of known hosts. [ 44.956364] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 45.186986] ------------[ cut here ]------------ [ 45.191759] WARNING: CPU: 1 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 45.200260] Kernel panic - not syncing: panic_on_warn set ... [ 45.200260] [ 45.207605] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.122-g54068d6 #26 [ 45.214589] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.223931] ffff8801db307cc0 ffffffff81eb8829 ffffffff83c48ac0 00000000ffffffff [ 45.231920] 0000000000000000 0000000000000001 00000000000000a7 ffff8801db307d80 [ 45.239921] ffffffff81423f35 0000000041b58ab3 ffffffff843bb838 ffffffff81423d76 [ 45.247973] Call Trace: [ 45.250629] [ 45.252692] [] dump_stack+0xc1/0x128 [ 45.258092] [] panic+0x1bf/0x3bc [ 45.263102] [] ? add_taint.cold.6+0x16/0x16 [ 45.269050] [] ? __warn.cold.9+0xa6/0x17f [ 45.274823] [] ? inet_sock_destruct+0x598/0x760 [ 45.281131] [] __warn.cold.9+0xc1/0x17f [ 45.286739] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 45.293213] [] warn_slowpath_null+0x2c/0x40 [ 45.299160] [] inet_sock_destruct+0x598/0x760 [ 45.305281] [] ? ipv4_mib_init_net+0x570/0x570 [ 45.311497] [] l2tp_tunnel_destruct+0x339/0x590 [ 45.317804] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 45.324335] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 45.330823] [] __sk_destruct+0x55/0x590 [ 45.336431] [] rcu_process_callbacks+0x8ae/0x12b0 [ 45.342908] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 45.349592] [] ? sock_set_timeout+0x210/0x210 [ 45.355718] [] __do_softirq+0x210/0x940 [ 45.361844] [] irq_exit+0x114/0x150 [ 45.367106] [] smp_apic_timer_interrupt+0x81/0xa0 [ 45.373577] [] apic_timer_interrupt+0xa0/0xb0 [ 45.379690] [ 45.381737] [] ? native_safe_halt+0x6/0x10 [ 45.387618] [] ? trace_hardirqs_on+0xd/0x10 [ 45.393759] [] default_idle+0x55/0x360 [ 45.399281] [] arch_cpu_idle+0x10/0x20 [ 45.404792] [] default_idle_call+0x45/0x60 [ 45.410706] [] cpu_startup_entry+0x2b5/0x380 [ 45.416799] [] ? cpu_in_idle+0x20/0x20 [ 45.422371] [] start_secondary+0x328/0x400 [ 45.428241] [] ? set_cpu_sibling_map+0x1340/0x1340 [ 45.435405] Dumping ftrace buffer: [ 45.438968] (ftrace buffer empty) [ 45.442708] Kernel Offset: disabled [ 45.446333] Rebooting in 86400 seconds..