[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.550896] 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: [ 20.117418] random: sshd: uninitialized urandom read (32 bytes read) [ 20.399608] random: sshd: uninitialized urandom read (32 bytes read) [ 20.929782] random: sshd: uninitialized urandom read (32 bytes read) [ 25.331176] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.47' (ECDSA) to the list of known hosts. [ 30.898221] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 31.131990] ------------[ cut here ]------------ [ 31.136795] WARNING: CPU: 1 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 31.145364] Kernel panic - not syncing: panic_on_warn set ... [ 31.145364] [ 31.152732] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.119-g9dc978d #75 [ 31.159725] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.169063] ffff8801db307cc0 ffffffff81eb4be9 ffffffff83c48980 00000000ffffffff [ 31.177108] 0000000000000000 0000000000000001 00000000000000a7 ffff8801db307d80 [ 31.185157] ffffffff81421c95 0000000041b58ab3 ffffffff843bc020 ffffffff81421ad6 [ 31.193188] Call Trace: [ 31.195841] [ 31.197891] [] dump_stack+0xc1/0x128 [ 31.203388] [] panic+0x1bf/0x3bc [ 31.208504] [] ? add_taint.cold.6+0x16/0x16 [ 31.214566] [] ? __warn.cold.9+0xa6/0x17f [ 31.220358] [] ? inet_sock_destruct+0x598/0x760 [ 31.226660] [] __warn.cold.9+0xc1/0x17f [ 31.232272] [] warn_slowpath_null+0x2c/0x40 [ 31.238227] [] inet_sock_destruct+0x598/0x760 [ 31.244357] [] ? ipv4_mib_init_net+0x570/0x570 [ 31.250583] [] l2tp_tunnel_destruct+0x339/0x590 [ 31.257001] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 31.263479] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 31.269973] [] __sk_destruct+0x55/0x590 [ 31.275591] [] rcu_process_callbacks+0x8ae/0x12b0 [ 31.282066] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 31.288716] [] ? sock_set_timeout+0x210/0x210 [ 31.294966] [] __do_softirq+0x20b/0x937 [ 31.300576] [] irq_exit+0x147/0x190 [ 31.305847] [] smp_apic_timer_interrupt+0x81/0xa0 [ 31.312333] [] apic_timer_interrupt+0xa0/0xb0 [ 31.318456] [ 31.320529] [] ? native_safe_halt+0x6/0x10 [ 31.326428] [] ? trace_hardirqs_on+0xd/0x10 [ 31.332384] [] default_idle+0x55/0x360 [ 31.337910] [] arch_cpu_idle+0x10/0x20 [ 31.343437] [] default_idle_call+0x45/0x60 [ 31.349437] [] cpu_startup_entry+0x2b5/0x380 [ 31.355480] [] ? cpu_in_idle+0x20/0x20 [ 31.361153] [] start_secondary+0x328/0x400 [ 31.367030] [] ? set_cpu_sibling_map+0x1300/0x1300 [ 31.374351] Dumping ftrace buffer: [ 31.377904] (ftrace buffer empty) [ 31.381598] Kernel Offset: disabled [ 31.385214] Rebooting in 86400 seconds..