[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.702321] 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: [ 24.440019] random: sshd: uninitialized urandom read (32 bytes read) [ 24.928934] random: sshd: uninitialized urandom read (32 bytes read) [ 25.536617] random: sshd: uninitialized urandom read (32 bytes read) [ 25.679603] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.58' (ECDSA) to the list of known hosts. [ 31.293910] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 31.512085] ------------[ cut here ]------------ [ 31.516948] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 31.525461] Kernel panic - not syncing: panic_on_warn set ... [ 31.525461] [ 31.533000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.120-gf85543b #76 [ 31.539998] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.549347] ffff8801db207cc0 ffffffff81eb8049 ffffffff83c48ac0 00000000ffffffff [ 31.557501] 0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80 [ 31.565595] ffffffff814239b5 0000000041b58ab3 ffffffff843bb7e8 ffffffff814237f6 [ 31.573637] Call Trace: [ 31.576205] [ 31.578390] [] dump_stack+0xc1/0x128 [ 31.583764] [] panic+0x1bf/0x3bc [ 31.588856] [] ? add_taint.cold.6+0x16/0x16 [ 31.594915] [] ? __warn.cold.9+0xa6/0x17f [ 31.600794] [] ? inet_sock_destruct+0x598/0x760 [ 31.607113] [] __warn.cold.9+0xc1/0x17f [ 31.612729] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 31.619362] [] warn_slowpath_null+0x2c/0x40 [ 31.625324] [] inet_sock_destruct+0x598/0x760 [ 31.631458] [] ? ipv4_mib_init_net+0x570/0x570 [ 31.637814] [] l2tp_tunnel_destruct+0x339/0x590 [ 31.644128] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 31.650610] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 31.657093] [] __sk_destruct+0x55/0x590 [ 31.663057] [] rcu_process_callbacks+0x8ae/0x12b0 [ 31.669545] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 31.676203] [] ? sock_set_timeout+0x210/0x210 [ 31.682339] [] __do_softirq+0x210/0x940 [ 31.688063] [] irq_exit+0x114/0x150 [ 31.693338] [] smp_apic_timer_interrupt+0x81/0xa0 [ 31.699817] [] apic_timer_interrupt+0xa0/0xb0 [ 31.705984] [ 31.708060] [] ? native_safe_halt+0x6/0x10 [ 31.714102] [] default_idle+0x55/0x360 [ 31.719638] [] arch_cpu_idle+0x10/0x20 [ 31.725163] [] default_idle_call+0x45/0x60 [ 31.731059] [] cpu_startup_entry+0x2b5/0x380 [ 31.737125] [] ? cpu_in_idle+0x20/0x20 [ 31.742663] [] rest_init+0x183/0x189 [ 31.748017] [] start_kernel+0x67e/0x6b2 [ 31.753653] [] ? thread_stack_cache_init+0xb/0xb [ 31.760068] [] ? x86_family+0x32/0x40 [ 31.765515] [] ? early_idt_handler_array+0x120/0x120 [ 31.772272] [] x86_64_start_reservations+0x29/0x2b [ 31.778851] [] x86_64_start_kernel+0x13f/0x162 [ 31.785702] Dumping ftrace buffer: [ 31.789299] (ftrace buffer empty) [ 31.793003] Kernel Offset: disabled [ 31.796630] Rebooting in 86400 seconds..