[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.790733] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.822033] random: sshd: uninitialized urandom read (32 bytes read) [ 24.240393] random: sshd: uninitialized urandom read (32 bytes read) [ 25.264102] random: sshd: uninitialized urandom read (32 bytes read) [ 25.410330] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.16' (ECDSA) to the list of known hosts. [ 30.876836] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 31.097748] ------------[ cut here ]------------ [ 31.102568] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 31.111070] Kernel panic - not syncing: panic_on_warn set ... [ 31.111070] [ 31.118434] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.113-g47bbcd6 #10 [ 31.125433] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.134786] ffff8801db207cc0 ffffffff81eb32a9 ffffffff83c48980 00000000ffffffff [ 31.142855] 0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80 [ 31.150918] ffffffff81421a55 0000000041b58ab3 ffffffff843bb788 ffffffff81421896 [ 31.158962] Call Trace: [ 31.161527] [ 31.163589] [] dump_stack+0xc1/0x128 [ 31.168978] [] panic+0x1bf/0x3bc [ 31.173981] [] ? add_taint.cold.6+0x16/0x16 [ 31.179938] [] ? __warn.cold.9+0xa6/0x17f [ 31.185724] [] ? inet_sock_destruct+0x598/0x760 [ 31.192029] [] __warn.cold.9+0xc1/0x17f [ 31.197640] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 31.204119] [] warn_slowpath_null+0x2c/0x40 [ 31.210079] [] inet_sock_destruct+0x598/0x760 [ 31.216227] [] ? ipv4_mib_init_net+0x570/0x570 [ 31.222445] [] l2tp_tunnel_destruct+0x339/0x590 [ 31.228759] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 31.235233] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 31.241727] [] __sk_destruct+0x55/0x590 [ 31.247339] [] rcu_process_callbacks+0x8ae/0x12b0 [ 31.253828] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 31.260490] [] ? sock_set_timeout+0x210/0x210 [ 31.266631] [] __do_softirq+0x20b/0x937 [ 31.272328] [] irq_exit+0x147/0x190 [ 31.277589] [] smp_apic_timer_interrupt+0x81/0xa0 [ 31.284076] [] apic_timer_interrupt+0xa0/0xb0 [ 31.290201] [ 31.292253] [] ? native_safe_halt+0x6/0x10 [ 31.298143] [] default_idle+0x55/0x360 [ 31.303672] [] arch_cpu_idle+0x10/0x20 [ 31.309192] [] default_idle_call+0x45/0x60 [ 31.315091] [] cpu_startup_entry+0x2b5/0x380 [ 31.321139] [] ? cpu_in_idle+0x20/0x20 [ 31.326672] [] rest_init+0x183/0x189 [ 31.332028] [] start_kernel+0x67e/0x6b2 [ 31.337650] [] ? thread_stack_cache_init+0xb/0xb [ 31.344054] [] ? x86_family+0x32/0x40 [ 31.349491] [] ? early_idt_handler_array+0x120/0x120 [ 31.356243] [] x86_64_start_reservations+0x29/0x2b [ 31.362823] [] x86_64_start_kernel+0x13f/0x162 [ 31.369738] Dumping ftrace buffer: [ 31.373325] (ftrace buffer empty) [ 31.377020] Kernel Offset: disabled [ 31.380652] Rebooting in 86400 seconds..