[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.104083] 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: [ 15.660340] random: sshd: uninitialized urandom read (32 bytes read) [ 15.934549] random: sshd: uninitialized urandom read (32 bytes read) [ 16.862501] random: sshd: uninitialized urandom read (32 bytes read) [ 32.218602] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.19' (ECDSA) to the list of known hosts. [ 37.683998] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 37.865853] ------------[ cut here ]------------ [ 37.870639] WARNING: CPU: 1 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 37.879136] Kernel panic - not syncing: panic_on_warn set ... [ 37.879136] [ 37.886475] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.111-g03c70fe #6 [ 37.893375] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.902708] ffff8801db307cc0 ffffffff81eb2729 ffffffff83c48980 00000000ffffffff [ 37.910720] 0000000000000000 0000000000000001 00000000000000a7 ffff8801db307d80 [ 37.918699] ffffffff814219f5 0000000041b58ab3 ffffffff843ba8c0 ffffffff81421836 [ 37.926677] Call Trace: [ 37.929232] [ 37.931272] [] dump_stack+0xc1/0x128 [ 37.936633] [] panic+0x1bf/0x3bc [ 37.941622] [] ? add_taint.cold.6+0x16/0x16 [ 37.947566] [] ? __warn.cold.9+0xa6/0x17f [ 37.953424] [] ? inet_sock_destruct+0x598/0x760 [ 37.959801] [] __warn.cold.9+0xc1/0x17f [ 37.965399] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 37.971879] [] warn_slowpath_null+0x2c/0x40 [ 37.977821] [] inet_sock_destruct+0x598/0x760 [ 37.983941] [] ? ipv4_mib_init_net+0x570/0x570 [ 37.990144] [] l2tp_tunnel_destruct+0x339/0x590 [ 37.996434] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 38.003427] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 38.010001] [] __sk_destruct+0x55/0x590 [ 38.015600] [] rcu_process_callbacks+0x8ae/0x12b0 [ 38.022065] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 38.028727] [] ? sock_set_timeout+0x210/0x210 [ 38.034847] [] __do_softirq+0x20b/0x937 [ 38.040455] [] irq_exit+0x147/0x190 [ 38.045715] [] smp_apic_timer_interrupt+0x81/0xa0 [ 38.052179] [] apic_timer_interrupt+0xa0/0xb0 [ 38.058291] [ 38.060427] [] ? native_safe_halt+0x6/0x10 [ 38.066309] [] ? trace_hardirqs_on+0xd/0x10 [ 38.072360] [] default_idle+0x55/0x360 [ 38.077879] [] arch_cpu_idle+0x10/0x20 [ 38.083388] [] default_idle_call+0x45/0x60 [ 38.089245] [] cpu_startup_entry+0x2b5/0x380 [ 38.095273] [] ? cpu_in_idle+0x20/0x20 [ 38.100788] [] start_secondary+0x328/0x400 [ 38.106647] [] ? set_cpu_sibling_map+0x1300/0x1300 [ 38.113775] Dumping ftrace buffer: [ 38.117360] (ftrace buffer empty) [ 38.121046] Kernel Offset: disabled [ 38.124657] Rebooting in 86400 seconds..