[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.741658] 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: [ 21.541519] random: sshd: uninitialized urandom read (32 bytes read) [ 21.970655] random: sshd: uninitialized urandom read (32 bytes read) [ 22.464113] random: sshd: uninitialized urandom read (32 bytes read) [ 22.604323] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.11' (ECDSA) to the list of known hosts. [ 28.323983] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 28.558508] ------------[ cut here ]------------ [ 28.563553] WARNING: CPU: 1 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 28.572048] Kernel panic - not syncing: panic_on_warn set ... [ 28.572048] [ 28.579411] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.122-g54068d6 #78 [ 28.586399] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.595731] ffff8801db307cc0 ffffffff81eb8829 ffffffff83c48ac0 00000000ffffffff [ 28.603829] 0000000000000000 0000000000000001 00000000000000a7 ffff8801db307d80 [ 28.611913] ffffffff81423f35 0000000041b58ab3 ffffffff843bb838 ffffffff81423d76 [ 28.619942] Call Trace: [ 28.622509] [ 28.624555] [] dump_stack+0xc1/0x128 [ 28.629917] [] panic+0x1bf/0x3bc [ 28.634922] [] ? add_taint.cold.6+0x16/0x16 [ 28.641116] [] ? __warn.cold.9+0xa6/0x17f [ 28.646909] [] ? inet_sock_destruct+0x598/0x760 [ 28.653211] [] __warn.cold.9+0xc1/0x17f [ 28.658883] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 28.665361] [] warn_slowpath_null+0x2c/0x40 [ 28.671320] [] inet_sock_destruct+0x598/0x760 [ 28.677512] [] ? ipv4_mib_init_net+0x570/0x570 [ 28.683728] [] l2tp_tunnel_destruct+0x339/0x590 [ 28.690128] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 28.696600] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 28.703075] [] __sk_destruct+0x55/0x590 [ 28.708743] [] rcu_process_callbacks+0x8ae/0x12b0 [ 28.715216] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 28.721858] [] ? sock_set_timeout+0x210/0x210 [ 28.727992] [] __do_softirq+0x210/0x940 [ 28.733607] [] irq_exit+0x114/0x150 [ 28.738874] [] smp_apic_timer_interrupt+0x81/0xa0 [ 28.745344] [] apic_timer_interrupt+0xa0/0xb0 [ 28.751466] [ 28.753526] [] ? native_safe_halt+0x6/0x10 [ 28.759663] [] ? trace_hardirqs_on+0xd/0x10 [ 28.765615] [] default_idle+0x55/0x360 [ 28.771419] [] arch_cpu_idle+0x10/0x20 [ 28.776951] [] default_idle_call+0x45/0x60 [ 28.782835] [] cpu_startup_entry+0x2b5/0x380 [ 28.788877] [] ? cpu_in_idle+0x20/0x20 [ 28.794394] [] start_secondary+0x328/0x400 [ 28.800265] [] ? set_cpu_sibling_map+0x1340/0x1340 [ 28.807229] Dumping ftrace buffer: [ 28.810766] (ftrace buffer empty) [ 28.814453] Kernel Offset: disabled [ 28.818062] Rebooting in 86400 seconds..