[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.355559] 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: [ 16.978658] random: sshd: uninitialized urandom read (32 bytes read) [ 17.377126] random: sshd: uninitialized urandom read (32 bytes read) [ 18.319941] random: sshd: uninitialized urandom read (32 bytes read) [ 22.667172] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.7' (ECDSA) to the list of known hosts. [ 28.162795] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 28.392736] ------------[ cut here ]------------ [ 28.398127] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 28.406778] Kernel panic - not syncing: panic_on_warn set ... [ 28.406778] [ 28.414119] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.112-gf540ce0 #60 [ 28.421113] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.430445] ffff8801db207cc0 ffffffff81eb3249 ffffffff83c48980 00000000ffffffff [ 28.438592] 0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80 [ 28.446610] ffffffff81421a55 0000000041b58ab3 ffffffff843baee0 ffffffff81421896 [ 28.454749] Call Trace: [ 28.457318] [ 28.459361] [] dump_stack+0xc1/0x128 [ 28.464718] [] panic+0x1bf/0x3bc [ 28.469708] [] ? add_taint.cold.6+0x16/0x16 [ 28.475659] [] ? __warn.cold.9+0xa6/0x17f [ 28.481436] [] ? inet_sock_destruct+0x598/0x760 [ 28.487739] [] __warn.cold.9+0xc1/0x17f [ 28.493336] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 28.499819] [] warn_slowpath_null+0x2c/0x40 [ 28.505768] [] inet_sock_destruct+0x598/0x760 [ 28.511893] [] ? ipv4_mib_init_net+0x570/0x570 [ 28.518113] [] l2tp_tunnel_destruct+0x339/0x590 [ 28.524405] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 28.530871] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 28.537348] [] __sk_destruct+0x55/0x590 [ 28.542945] [] rcu_process_callbacks+0x8ae/0x12b0 [ 28.549408] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 28.556053] [] ? sock_set_timeout+0x210/0x210 [ 28.562779] [] __do_softirq+0x20b/0x937 [ 28.568382] [] irq_exit+0x147/0x190 [ 28.573631] [] smp_apic_timer_interrupt+0x81/0xa0 [ 28.580095] [] apic_timer_interrupt+0xa0/0xb0 [ 28.586215] [ 28.588253] [] ? native_safe_halt+0x6/0x10 [ 28.594132] [] default_idle+0x55/0x360 [ 28.599644] [] arch_cpu_idle+0x10/0x20 [ 28.605163] [] default_idle_call+0x45/0x60 [ 28.611108] [] cpu_startup_entry+0x2b5/0x380 [ 28.617146] [] ? cpu_in_idle+0x20/0x20 [ 28.622684] [] rest_init+0x183/0x189 [ 28.628029] [] start_kernel+0x67e/0x6b2 [ 28.633625] [] ? thread_stack_cache_init+0xb/0xb [ 28.640009] [] ? x86_family+0x32/0x40 [ 28.645430] [] ? early_idt_handler_array+0x120/0x120 [ 28.652157] [] x86_64_start_reservations+0x29/0x2b [ 28.658716] [] x86_64_start_kernel+0x13f/0x162 [ 28.665711] Dumping ftrace buffer: [ 28.669269] (ftrace buffer empty) [ 28.672962] Kernel Offset: disabled [ 28.676575] Rebooting in 86400 seconds..