[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.738310] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.286270] random: sshd: uninitialized urandom read (32 bytes read) [ 20.588398] random: sshd: uninitialized urandom read (32 bytes read) [ 21.346559] random: sshd: uninitialized urandom read (32 bytes read) [ 21.489401] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.17' (ECDSA) to the list of known hosts. [ 26.906465] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 27.107997] ------------[ cut here ]------------ [ 27.112790] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 27.121272] Kernel panic - not syncing: panic_on_warn set ... [ 27.121272] [ 27.128609] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.101-gaef17a5 #32 [ 27.135590] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.145211] ffff8801db207cc0 ffffffff81eb1009 ffffffff83c484a0 00000000ffffffff [ 27.153228] 0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80 [ 27.161252] ffffffff8141f925 0000000041b58ab3 ffffffff843b87e8 ffffffff8141f766 [ 27.169360] Call Trace: [ 27.171932] [ 27.173983] [] dump_stack+0xc1/0x128 [ 27.179378] [] panic+0x1bf/0x3bc [ 27.184629] [] ? add_taint.cold.6+0x16/0x16 [ 27.190683] [] ? __warn.cold.9+0xa6/0x17f [ 27.196456] [] ? inet_sock_destruct+0x598/0x760 [ 27.202854] [] __warn.cold.9+0xc1/0x17f [ 27.208455] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 27.214925] [] warn_slowpath_null+0x2c/0x40 [ 27.220875] [] inet_sock_destruct+0x598/0x760 [ 27.226995] [] ? ipv4_mib_init_net+0x570/0x570 [ 27.233216] [] l2tp_tunnel_destruct+0x339/0x590 [ 27.239545] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 27.246041] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 27.252517] [] __sk_destruct+0x55/0x590 [ 27.258173] [] rcu_process_callbacks+0x8ae/0x12b0 [ 27.264755] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 27.271489] [] ? sock_set_timeout+0x210/0x210 [ 27.277609] [] __do_softirq+0x20b/0x937 [ 27.283208] [] irq_exit+0x147/0x190 [ 27.288456] [] smp_apic_timer_interrupt+0x81/0xa0 [ 27.294920] [] apic_timer_interrupt+0xa0/0xb0 [ 27.301032] [ 27.303073] [] ? native_safe_halt+0x6/0x10 [ 27.308945] [] default_idle+0x55/0x360 [ 27.314457] [] arch_cpu_idle+0x10/0x20 [ 27.319970] [] default_idle_call+0x45/0x60 [ 27.325833] [] cpu_startup_entry+0x2b5/0x380 [ 27.331947] [] ? cpu_in_idle+0x20/0x20 [ 27.337456] [] rest_init+0x183/0x189 [ 27.342796] [] start_kernel+0x67e/0x6b2 [ 27.348392] [] ? thread_stack_cache_init+0xb/0xb [ 27.354772] [] ? x86_family+0x32/0x40 [ 27.360194] [] ? early_idt_handler_array+0x120/0x120 [ 27.366920] [] x86_64_start_reservations+0x29/0x2b [ 27.373471] [] x86_64_start_kernel+0x13f/0x162 [ 27.380436] Dumping ftrace buffer: [ 27.383986] (ftrace buffer empty) [ 27.387671] Kernel Offset: disabled [ 27.391286] Rebooting in 86400 seconds..