[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.595091] 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: [ 28.281132] random: sshd: uninitialized urandom read (32 bytes read) [ 28.965709] random: sshd: uninitialized urandom read (32 bytes read) [ 29.856341] random: sshd: uninitialized urandom read (32 bytes read) [ 30.002067] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.206' (ECDSA) to the list of known hosts. [ 35.490315] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 35.710818] ------------[ cut here ]------------ [ 35.715630] WARNING: CPU: 1 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 35.724256] Kernel panic - not syncing: panic_on_warn set ... [ 35.724256] [ 35.731673] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.112-g9e79039 #59 [ 35.738714] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.748076] ffff8801db307cc0 ffffffff81eb3249 ffffffff83c48980 00000000ffffffff [ 35.756140] 0000000000000000 0000000000000001 00000000000000a7 ffff8801db307d80 [ 35.764385] ffffffff81421a55 0000000041b58ab3 ffffffff843bae78 ffffffff81421896 [ 35.764386] Call Trace: [ 35.764400] [ 35.764400] [] dump_stack+0xc1/0x128 [ 35.764407] [] panic+0x1bf/0x3bc [ 35.764413] [] ? add_taint.cold.6+0x16/0x16 [ 35.764417] [] ? __warn.cold.9+0xa6/0x17f [ 35.764425] [] ? inet_sock_destruct+0x598/0x760 [ 35.764429] [] __warn.cold.9+0xc1/0x17f [ 35.764437] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 35.764443] [] warn_slowpath_null+0x2c/0x40 [ 35.764448] [] inet_sock_destruct+0x598/0x760 [ 35.764453] [] ? ipv4_mib_init_net+0x570/0x570 [ 35.764457] [] l2tp_tunnel_destruct+0x339/0x590 [ 35.764461] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 35.764465] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 35.764471] [] __sk_destruct+0x55/0x590 [ 35.764478] [] rcu_process_callbacks+0x8ae/0x12b0 [ 35.764482] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 35.764487] [] ? sock_set_timeout+0x210/0x210 [ 35.764494] [] __do_softirq+0x20b/0x937 [ 35.764499] [] irq_exit+0x147/0x190 [ 35.764504] [] smp_apic_timer_interrupt+0x81/0xa0 [ 35.764508] [] apic_timer_interrupt+0xa0/0xb0 [ 35.764516] [ 35.764516] [] ? native_safe_halt+0x6/0x10 [ 35.764523] [] ? trace_hardirqs_on+0xd/0x10 [ 35.764528] [] default_idle+0x55/0x360 [ 35.764534] [] arch_cpu_idle+0x10/0x20 [ 35.764539] [] default_idle_call+0x45/0x60 [ 35.764544] [] cpu_startup_entry+0x2b5/0x380 [ 35.764548] [] ? cpu_in_idle+0x20/0x20 [ 35.764553] [] start_secondary+0x328/0x400 [ 35.764558] [] ? set_cpu_sibling_map+0x1300/0x1300 [ 35.765118] Dumping ftrace buffer: [ 35.765149] (ftrace buffer empty) [ 35.765151] Kernel Offset: disabled [ 35.971552] Rebooting in 86400 seconds..