[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.883751] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.668764] random: sshd: uninitialized urandom read (32 bytes read) [ 24.000897] random: sshd: uninitialized urandom read (32 bytes read) [ 24.509822] random: sshd: uninitialized urandom read (32 bytes read) [ 41.006905] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.0' (ECDSA) to the list of known hosts. [ 46.566305] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 46.788664] ------------[ cut here ]------------ [ 46.793558] WARNING: CPU: 1 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 46.802051] Kernel panic - not syncing: panic_on_warn set ... [ 46.802051] [ 46.809514] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.123-g8dd3fc2 #79 [ 46.816505] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.825844] ffff8801db307cc0 ffffffff81eb9689 ffffffff83c48ac0 00000000ffffffff [ 46.833909] 0000000000000000 0000000000000001 00000000000000a7 ffff8801db307d80 [ 46.841915] ffffffff81423f75 0000000041b58ab3 ffffffff843bb878 ffffffff81423db6 [ 46.849994] Call Trace: [ 46.852558] [ 46.854606] [] dump_stack+0xc1/0x128 [ 46.859980] [] panic+0x1bf/0x3bc [ 46.865028] [] ? add_taint.cold.6+0x16/0x16 [ 46.871032] [] ? __warn.cold.9+0xa6/0x17f [ 46.876829] [] ? inet_sock_destruct+0x598/0x760 [ 46.883140] [] __warn.cold.9+0xc1/0x17f [ 46.888751] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 46.895235] [] warn_slowpath_null+0x2c/0x40 [ 46.901209] [] inet_sock_destruct+0x598/0x760 [ 46.907346] [] ? ipv4_mib_init_net+0x570/0x570 [ 46.913558] [] l2tp_tunnel_destruct+0x339/0x590 [ 46.919860] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 46.926477] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 46.932955] [] __sk_destruct+0x55/0x590 [ 46.938564] [] rcu_process_callbacks+0x8ae/0x12b0 [ 46.945036] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 46.951853] [] ? sock_set_timeout+0x210/0x210 [ 46.957987] [] __do_softirq+0x210/0x940 [ 46.963699] [] irq_exit+0x114/0x150 [ 46.968964] [] smp_apic_timer_interrupt+0x81/0xa0 [ 46.975437] [] apic_timer_interrupt+0xa0/0xb0 [ 46.981603] [ 46.983658] [] ? native_safe_halt+0x6/0x10 [ 46.989541] [] ? trace_hardirqs_on+0xd/0x10 [ 46.995502] [] default_idle+0x55/0x360 [ 47.001041] [] arch_cpu_idle+0x10/0x20 [ 47.006575] [] default_idle_call+0x45/0x60 [ 47.012514] [] cpu_startup_entry+0x2b5/0x380 [ 47.018559] [] ? cpu_in_idle+0x20/0x20 [ 47.024082] [] start_secondary+0x328/0x400 [ 47.029950] [] ? set_cpu_sibling_map+0x1340/0x1340 [ 47.036919] Dumping ftrace buffer: [ 47.040483] (ftrace buffer empty) [ 47.044174] Kernel Offset: disabled [ 47.047792] Rebooting in 86400 seconds..