[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.060420] 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: [ 18.831245] random: sshd: uninitialized urandom read (32 bytes read) [ 19.094206] random: sshd: uninitialized urandom read (32 bytes read) [ 19.644061] random: sshd: uninitialized urandom read (32 bytes read) [ 31.224313] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.36' (ECDSA) to the list of known hosts. [ 36.804123] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 37.036864] ------------[ cut here ]------------ [ 37.041636] WARNING: CPU: 1 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 37.050142] Kernel panic - not syncing: panic_on_warn set ... [ 37.050142] [ 37.057479] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.122-g54068d6 #26 [ 37.064505] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.073839] ffff8801db307cc0 ffffffff81eb8829 ffffffff83c48ac0 00000000ffffffff [ 37.081983] 0000000000000000 0000000000000001 00000000000000a7 ffff8801db307d80 [ 37.090011] ffffffff81423f35 0000000041b58ab3 ffffffff843bb838 ffffffff81423d76 [ 37.098039] Call Trace: [ 37.100596] [ 37.102640] [] dump_stack+0xc1/0x128 [ 37.108025] [] panic+0x1bf/0x3bc [ 37.113023] [] ? add_taint.cold.6+0x16/0x16 [ 37.118970] [] ? __warn.cold.9+0xa6/0x17f [ 37.124742] [] ? inet_sock_destruct+0x598/0x760 [ 37.131036] [] __warn.cold.9+0xc1/0x17f [ 37.136639] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 37.143110] [] warn_slowpath_null+0x2c/0x40 [ 37.149057] [] inet_sock_destruct+0x598/0x760 [ 37.155175] [] ? ipv4_mib_init_net+0x570/0x570 [ 37.161382] [] l2tp_tunnel_destruct+0x339/0x590 [ 37.167674] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 37.174140] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 37.180605] [] __sk_destruct+0x55/0x590 [ 37.186208] [] rcu_process_callbacks+0x8ae/0x12b0 [ 37.192681] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 37.199324] [] ? sock_set_timeout+0x210/0x210 [ 37.205449] [] __do_softirq+0x210/0x940 [ 37.211051] [] irq_exit+0x114/0x150 [ 37.216300] [] smp_apic_timer_interrupt+0x81/0xa0 [ 37.222769] [] apic_timer_interrupt+0xa0/0xb0 [ 37.228977] [ 37.231132] [] ? native_safe_halt+0x6/0x10 [ 37.237010] [] ? trace_hardirqs_on+0xd/0x10 [ 37.242957] [] default_idle+0x55/0x360 [ 37.248488] [] arch_cpu_idle+0x10/0x20 [ 37.254002] [] default_idle_call+0x45/0x60 [ 37.259867] [] cpu_startup_entry+0x2b5/0x380 [ 37.265922] [] ? cpu_in_idle+0x20/0x20 [ 37.271442] [] start_secondary+0x328/0x400 [ 37.277329] [] ? set_cpu_sibling_map+0x1340/0x1340 [ 37.284228] Dumping ftrace buffer: [ 37.287785] (ftrace buffer empty) [ 37.291473] Kernel Offset: disabled [ 37.295084] Rebooting in 86400 seconds..