[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.301462] 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: [ 15.226625] random: sshd: uninitialized urandom read (32 bytes read) [ 15.480882] random: sshd: uninitialized urandom read (32 bytes read) [ 16.532516] random: sshd: uninitialized urandom read (32 bytes read) [ 16.668372] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.53' (ECDSA) to the list of known hosts. [ 22.252459] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 22.434011] ------------[ cut here ]------------ [ 22.438836] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 22.447326] Kernel panic - not syncing: panic_on_warn set ... [ 22.447326] [ 22.454681] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.109-g7143cbf #3 [ 22.461593] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.470934] ffff8801db207cc0 ffffffff81eb3e29 ffffffff83c48960 00000000ffffffff [ 22.478971] 0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80 [ 22.487025] ffffffff81421925 0000000041b58ab3 ffffffff843b9a00 ffffffff81421766 [ 22.495050] Call Trace: [ 22.497617] [ 22.499667] [] dump_stack+0xc1/0x128 [ 22.505042] [] panic+0x1bf/0x3bc [ 22.510047] [] ? add_taint.cold.6+0x16/0x16 [ 22.516003] [] ? __warn.cold.9+0xa6/0x17f [ 22.521800] [] ? inet_sock_destruct+0x598/0x760 [ 22.528134] [] __warn.cold.9+0xc1/0x17f [ 22.533744] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 22.540247] [] warn_slowpath_null+0x2c/0x40 [ 22.546222] [] inet_sock_destruct+0x598/0x760 [ 22.552385] [] ? ipv4_mib_init_net+0x570/0x570 [ 22.558611] [] l2tp_tunnel_destruct+0x339/0x590 [ 22.564924] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 22.571419] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 22.577896] [] __sk_destruct+0x55/0x590 [ 22.583534] [] rcu_process_callbacks+0x8ae/0x12b0 [ 22.590026] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 22.596677] [] ? sock_set_timeout+0x210/0x210 [ 22.602814] [] __do_softirq+0x20b/0x937 [ 22.608428] [] irq_exit+0x147/0x190 [ 22.613696] [] smp_apic_timer_interrupt+0x81/0xa0 [ 22.620175] [] apic_timer_interrupt+0xa0/0xb0 [ 22.626297] [ 22.628354] [] ? native_safe_halt+0x6/0x10 [ 22.634256] [] default_idle+0x55/0x360 [ 22.639788] [] arch_cpu_idle+0x10/0x20 [ 22.645315] [] default_idle_call+0x45/0x60 [ 22.651224] [] cpu_startup_entry+0x2b5/0x380 [ 22.657281] [] ? cpu_in_idle+0x20/0x20 [ 22.662803] [] rest_init+0x183/0x189 [ 22.668156] [] start_kernel+0x67e/0x6b2 [ 22.673782] [] ? thread_stack_cache_init+0xb/0xb [ 22.680182] [] ? x86_family+0x32/0x40 [ 22.685648] [] ? early_idt_handler_array+0x120/0x120 [ 22.692395] [] x86_64_start_reservations+0x29/0x2b [ 22.698980] [] x86_64_start_kernel+0x13f/0x162 [ 22.705979] Dumping ftrace buffer: [ 22.709580] (ftrace buffer empty) [ 22.713284] Kernel Offset: disabled [ 22.716909] Rebooting in 86400 seconds..