[....] Starting OpenBSD Secure Shell server: sshd[ 12.045342] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 12.386748] random: sshd: uninitialized urandom read (32 bytes read) [ 12.590578] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 13.695675] random: sshd: uninitialized urandom read (32 bytes read) [ 13.842635] random: sshd: uninitialized urandom read (32 bytes read) [ 14.319475] random: crng init done Warning: Permanently added '10.128.0.49' (ECDSA) to the list of known hosts. executing program executing program executing program [ 19.797015] ------------[ cut here ]------------ [ 19.801814] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 19.810298] Kernel panic - not syncing: panic_on_warn set ... [ 19.810298] [ 19.817660] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.107-gdb2c520 #49 [ 19.824654] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.833985] ffff8801db207cc0 ffffffff81eb3da9 ffffffff83c48b40 00000000ffffffff [ 19.841980] 0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80 [ 19.849975] ffffffff81421925 0000000041b58ab3 ffffffff843b9b48 ffffffff81421766 [ 19.857964] Call Trace: [ 19.860517] [ 19.862572] [] dump_stack+0xc1/0x128 [ 19.867934] [] panic+0x1bf/0x3bc [ 19.872925] [] ? add_taint.cold.6+0x16/0x16 [ 19.878868] [] ? __warn.cold.9+0xa6/0x17f [ 19.884639] [] ? inet_sock_destruct+0x598/0x760 [ 19.890928] [] __warn.cold.9+0xc1/0x17f [ 19.896528] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 19.902997] [] warn_slowpath_null+0x2c/0x40 [ 19.908943] [] inet_sock_destruct+0x598/0x760 [ 19.915059] [] ? ipv4_mib_init_net+0x570/0x570 [ 19.921280] [] l2tp_tunnel_destruct+0x339/0x590 [ 19.927583] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 19.934053] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 19.940519] [] __sk_destruct+0x55/0x590 [ 19.946117] [] rcu_process_callbacks+0x8ae/0x12b0 [ 19.952582] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 19.959226] [] ? sock_set_timeout+0x210/0x210 [ 19.965346] [] __do_softirq+0x20b/0x937 [ 19.970945] [] irq_exit+0x147/0x190 [ 19.976193] [] smp_apic_timer_interrupt+0x81/0xa0 [ 19.982667] [] apic_timer_interrupt+0xa0/0xb0 [ 19.988783] [ 19.990822] [] ? native_safe_halt+0x6/0x10 [ 19.996705] [] default_idle+0x55/0x360 [ 20.002224] [] arch_cpu_idle+0x10/0x20 [ 20.007734] [] default_idle_call+0x45/0x60 [ 20.013597] [] cpu_startup_entry+0x2b5/0x380 [ 20.019628] [] ? cpu_in_idle+0x20/0x20 [ 20.025139] [] rest_init+0x183/0x189 [ 20.030476] [] start_kernel+0x67e/0x6b2 [ 20.036083] [] ? thread_stack_cache_init+0xb/0xb [ 20.042462] [] ? x86_family+0x32/0x40 [ 20.047887] [] ? early_idt_handler_array+0x120/0x120 [ 20.054615] [] x86_64_start_reservations+0x29/0x2b [ 20.061165] [] x86_64_start_kernel+0x13f/0x162 [ 20.067973] Dumping ftrace buffer: [ 20.071555] (ftrace buffer empty) [ 20.075238] Kernel Offset: disabled [ 20.078845] Rebooting in 86400 seconds..