[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.680428] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.568169] random: sshd: uninitialized urandom read (32 bytes read) [ 27.056979] random: sshd: uninitialized urandom read (32 bytes read) [ 27.447515] random: sshd: uninitialized urandom read (32 bytes read) [ 27.575843] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.201' (ECDSA) to the list of known hosts. [ 33.057240] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 33.271695] ------------[ cut here ]------------ [ 33.276469] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 33.284958] Kernel panic - not syncing: panic_on_warn set ... [ 33.284958] [ 33.292292] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.117-g8b21e85 #71 [ 33.299286] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.308636] ffff8801db207cc0 ffffffff81eb4be9 ffffffff83c48980 00000000ffffffff [ 33.316617] 0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80 [ 33.324590] ffffffff81421c85 0000000041b58ab3 ffffffff843bc020 ffffffff81421ac6 [ 33.332569] Call Trace: [ 33.335132] [ 33.337179] [] dump_stack+0xc1/0x128 [ 33.342540] [] panic+0x1bf/0x3bc [ 33.347524] [] ? add_taint.cold.6+0x16/0x16 [ 33.353463] [] ? __warn.cold.9+0xa6/0x17f [ 33.359229] [] ? inet_sock_destruct+0x598/0x760 [ 33.365516] [] __warn.cold.9+0xc1/0x17f [ 33.371108] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 33.377568] [] warn_slowpath_null+0x2c/0x40 [ 33.383508] [] inet_sock_destruct+0x598/0x760 [ 33.389625] [] ? ipv4_mib_init_net+0x570/0x570 [ 33.395827] [] l2tp_tunnel_destruct+0x339/0x590 [ 33.402118] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 33.408606] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 33.415080] [] __sk_destruct+0x55/0x590 [ 33.420677] [] rcu_process_callbacks+0x8ae/0x12b0 [ 33.427144] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 33.433800] [] ? sock_set_timeout+0x210/0x210 [ 33.439934] [] __do_softirq+0x20b/0x937 [ 33.445534] [] irq_exit+0x147/0x190 [ 33.450783] [] smp_apic_timer_interrupt+0x81/0xa0 [ 33.457244] [] apic_timer_interrupt+0xa0/0xb0 [ 33.463355] [ 33.465392] [] ? native_safe_halt+0x6/0x10 [ 33.471264] [] default_idle+0x55/0x360 [ 33.476781] [] arch_cpu_idle+0x10/0x20 [ 33.482290] [] default_idle_call+0x45/0x60 [ 33.488144] [] cpu_startup_entry+0x2b5/0x380 [ 33.494169] [] ? cpu_in_idle+0x20/0x20 [ 33.499677] [] rest_init+0x183/0x189 [ 33.505012] [] start_kernel+0x67e/0x6b2 [ 33.510605] [] ? thread_stack_cache_init+0xb/0xb [ 33.517010] [] ? x86_family+0x32/0x40 [ 33.522431] [] ? early_idt_handler_array+0x120/0x120 [ 33.529151] [] x86_64_start_reservations+0x29/0x2b [ 33.535699] [] x86_64_start_kernel+0x13f/0x162 [ 33.542226] Dumping ftrace buffer: [ 33.545762] (ftrace buffer empty) [ 33.549450] Kernel Offset: disabled [ 33.553056] Rebooting in 86400 seconds..