[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.522024] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.957383] random: sshd: uninitialized urandom read (32 bytes read) [ 27.583632] random: sshd: uninitialized urandom read (32 bytes read) [ 28.021936] random: sshd: uninitialized urandom read (32 bytes read) [ 28.146143] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.47' (ECDSA) to the list of known hosts. [ 33.628689] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 33.852987] ------------[ cut here ]------------ [ 33.857886] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 33.866505] Kernel panic - not syncing: panic_on_warn set ... [ 33.866505] [ 33.873860] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.122-g54068d6 #30 [ 33.880847] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.890331] ffff8801db207cc0 ffffffff81eb8829 ffffffff83c48ac0 00000000ffffffff [ 33.898512] 0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80 [ 33.906760] ffffffff81423f35 0000000041b58ab3 ffffffff843bb838 ffffffff81423d76 [ 33.914860] Call Trace: [ 33.917423] [ 33.919465] [] dump_stack+0xc1/0x128 [ 33.924824] [] panic+0x1bf/0x3bc [ 33.930010] [] ? add_taint.cold.6+0x16/0x16 [ 33.935967] [] ? __warn.cold.9+0xa6/0x17f [ 33.941742] [] ? inet_sock_destruct+0x598/0x760 [ 33.948047] [] __warn.cold.9+0xc1/0x17f [ 33.953769] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 33.960242] [] warn_slowpath_null+0x2c/0x40 [ 33.966196] [] inet_sock_destruct+0x598/0x760 [ 33.972328] [] ? ipv4_mib_init_net+0x570/0x570 [ 33.978537] [] l2tp_tunnel_destruct+0x339/0x590 [ 33.984829] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 33.991303] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 33.997793] [] __sk_destruct+0x55/0x590 [ 34.003397] [] rcu_process_callbacks+0x8ae/0x12b0 [ 34.009985] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 34.016644] [] ? sock_set_timeout+0x210/0x210 [ 34.022777] [] __do_softirq+0x210/0x940 [ 34.028395] [] irq_exit+0x114/0x150 [ 34.033662] [] smp_apic_timer_interrupt+0x81/0xa0 [ 34.040145] [] apic_timer_interrupt+0xa0/0xb0 [ 34.046362] [ 34.048506] [] ? native_safe_halt+0x6/0x10 [ 34.054536] [] default_idle+0x55/0x360 [ 34.060051] [] arch_cpu_idle+0x10/0x20 [ 34.065564] [] default_idle_call+0x45/0x60 [ 34.071536] [] cpu_startup_entry+0x2b5/0x380 [ 34.077682] [] ? cpu_in_idle+0x20/0x20 [ 34.083282] [] rest_init+0x183/0x189 [ 34.088634] [] start_kernel+0x67e/0x6b2 [ 34.094322] [] ? thread_stack_cache_init+0xb/0xb [ 34.100721] [] ? x86_family+0x32/0x40 [ 34.106147] [] ? early_idt_handler_array+0x120/0x120 [ 34.112871] [] x86_64_start_reservations+0x29/0x2b [ 34.119441] [] x86_64_start_kernel+0x13f/0x162 [ 34.126017] Dumping ftrace buffer: [ 34.129569] (ftrace buffer empty) [ 34.133271] Kernel Offset: disabled [ 34.136883] Rebooting in 86400 seconds..