[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 11.707565] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.508424] random: sshd: uninitialized urandom read (32 bytes read) [ 26.923358] random: sshd: uninitialized urandom read (32 bytes read) [ 27.462157] random: sshd: uninitialized urandom read (32 bytes read) [ 27.586070] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.29' (ECDSA) to the list of known hosts. [ 33.036742] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 33.215731] ------------[ cut here ]------------ [ 33.220545] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 33.229027] Kernel panic - not syncing: panic_on_warn set ... [ 33.229027] [ 33.236362] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.101-gaef17a5 #29 [ 33.243379] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.252710] ffff8801db207cc0 ffffffff81eb1009 ffffffff83c484a0 00000000ffffffff [ 33.260692] 0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80 [ 33.268693] ffffffff8141f925 0000000041b58ab3 ffffffff843b87e8 ffffffff8141f766 [ 33.276680] Call Trace: [ 33.279235] [ 33.281276] [] dump_stack+0xc1/0x128 [ 33.286630] [] panic+0x1bf/0x3bc [ 33.291621] [] ? add_taint.cold.6+0x16/0x16 [ 33.297565] [] ? __warn.cold.9+0xa6/0x17f [ 33.303339] [] ? inet_sock_destruct+0x598/0x760 [ 33.309630] [] __warn.cold.9+0xc1/0x17f [ 33.315239] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 33.321720] [] warn_slowpath_null+0x2c/0x40 [ 33.327661] [] inet_sock_destruct+0x598/0x760 [ 33.333791] [] ? ipv4_mib_init_net+0x570/0x570 [ 33.340010] [] l2tp_tunnel_destruct+0x339/0x590 [ 33.346311] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 33.352774] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 33.359247] [] __sk_destruct+0x55/0x590 [ 33.364854] [] rcu_process_callbacks+0x8ae/0x12b0 [ 33.371316] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 33.377954] [] ? sock_set_timeout+0x210/0x210 [ 33.384072] [] __do_softirq+0x20b/0x937 [ 33.389668] [] irq_exit+0x147/0x190 [ 33.394916] [] smp_apic_timer_interrupt+0x81/0xa0 [ 33.401387] [] apic_timer_interrupt+0xa0/0xb0 [ 33.407502] [ 33.409542] [] ? native_safe_halt+0x6/0x10 [ 33.415414] [] default_idle+0x55/0x360 [ 33.420943] [] arch_cpu_idle+0x10/0x20 [ 33.426452] [] default_idle_call+0x45/0x60 [ 33.432308] [] cpu_startup_entry+0x2b5/0x380 [ 33.438338] [] ? cpu_in_idle+0x20/0x20 [ 33.443846] [] rest_init+0x183/0x189 [ 33.449180] [] start_kernel+0x67e/0x6b2 [ 33.454774] [] ? thread_stack_cache_init+0xb/0xb [ 33.461151] [] ? x86_family+0x32/0x40 [ 33.466571] [] ? early_idt_handler_array+0x120/0x120 [ 33.473296] [] x86_64_start_reservations+0x29/0x2b [ 33.479855] [] x86_64_start_kernel+0x13f/0x162 [ 33.486656] Dumping ftrace buffer: [ 33.490191] (ftrace buffer empty) [ 33.493873] Kernel Offset: disabled [ 33.497484] Rebooting in 86400 seconds..