[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.206403] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.455001] random: sshd: uninitialized urandom read (32 bytes read) [ 20.816870] random: sshd: uninitialized urandom read (32 bytes read) [ 21.366209] random: sshd: uninitialized urandom read (32 bytes read) [ 21.508746] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.15' (ECDSA) to the list of known hosts. [ 27.207939] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 27.426133] ------------[ cut here ]------------ [ 27.430933] WARNING: CPU: 1 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 27.439475] Kernel panic - not syncing: panic_on_warn set ... [ 27.439475] [ 27.446833] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.121-g681e57b #25 [ 27.453826] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.463168] ffff8801db307cc0 ffffffff81eb7e29 ffffffff83c48ac0 00000000ffffffff [ 27.471168] 0000000000000000 0000000000000001 00000000000000a7 ffff8801db307d80 [ 27.479165] ffffffff81423b05 0000000041b58ab3 ffffffff843bb838 ffffffff81423946 [ 27.487161] Call Trace: [ 27.489717] [ 27.491771] [] dump_stack+0xc1/0x128 [ 27.497164] [] panic+0x1bf/0x3bc [ 27.502247] [] ? add_taint.cold.6+0x16/0x16 [ 27.508199] [] ? __warn.cold.9+0xa6/0x17f [ 27.513984] [] ? inet_sock_destruct+0x598/0x760 [ 27.520277] [] __warn.cold.9+0xc1/0x17f [ 27.525880] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 27.532380] [] warn_slowpath_null+0x2c/0x40 [ 27.538340] [] inet_sock_destruct+0x598/0x760 [ 27.544459] [] ? ipv4_mib_init_net+0x570/0x570 [ 27.550746] [] l2tp_tunnel_destruct+0x339/0x590 [ 27.557051] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 27.563522] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 27.569990] [] __sk_destruct+0x55/0x590 [ 27.575649] [] rcu_process_callbacks+0x8ae/0x12b0 [ 27.582125] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 27.588767] [] ? sock_set_timeout+0x210/0x210 [ 27.594907] [] __do_softirq+0x210/0x940 [ 27.600516] [] irq_exit+0x114/0x150 [ 27.605781] [] smp_apic_timer_interrupt+0x81/0xa0 [ 27.612259] [] apic_timer_interrupt+0xa0/0xb0 [ 27.618381] [ 27.620429] [] ? native_safe_halt+0x6/0x10 [ 27.626328] [] ? trace_hardirqs_on+0xd/0x10 [ 27.632326] [] default_idle+0x55/0x360 [ 27.637848] [] arch_cpu_idle+0x10/0x20 [ 27.643359] [] default_idle_call+0x45/0x60 [ 27.649219] [] cpu_startup_entry+0x2b5/0x380 [ 27.655256] [] ? cpu_in_idle+0x20/0x20 [ 27.660771] [] start_secondary+0x328/0x400 [ 27.666636] [] ? set_cpu_sibling_map+0x1340/0x1340 [ 27.673583] Dumping ftrace buffer: [ 27.677123] (ftrace buffer empty) [ 27.680810] Kernel Offset: disabled [ 27.684421] Rebooting in 86400 seconds..