[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.401467] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.740455] random: sshd: uninitialized urandom read (32 bytes read) [ 17.106082] random: sshd: uninitialized urandom read (32 bytes read) [ 17.870119] random: sshd: uninitialized urandom read (32 bytes read) [ 17.999721] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.62' (ECDSA) to the list of known hosts. [ 23.404043] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 23.584753] ------------[ cut here ]------------ [ 23.589549] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 23.598033] Kernel panic - not syncing: panic_on_warn set ... [ 23.598033] [ 23.605378] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.100-ge14d1a3 #30 [ 23.612361] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.621689] ffff8801db207cc0 ffffffff81eb0f09 ffffffff83c484a0 00000000ffffffff [ 23.629664] 0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80 [ 23.637655] ffffffff8141f895 0000000041b58ab3 ffffffff843b87e8 ffffffff8141f6d6 [ 23.645687] Call Trace: [ 23.648252] [ 23.650295] [] dump_stack+0xc1/0x128 [ 23.655654] [] panic+0x1bf/0x3bc [ 23.660643] [] ? add_taint.cold.6+0x16/0x16 [ 23.666591] [] ? __warn.cold.9+0xa6/0x17f [ 23.672364] [] ? inet_sock_destruct+0x598/0x760 [ 23.678650] [] __warn.cold.9+0xc1/0x17f [ 23.684244] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 23.690708] [] warn_slowpath_null+0x2c/0x40 [ 23.696652] [] inet_sock_destruct+0x598/0x760 [ 23.702765] [] ? ipv4_mib_init_net+0x570/0x570 [ 23.708981] [] l2tp_tunnel_destruct+0x339/0x590 [ 23.715451] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 23.721911] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 23.728378] [] __sk_destruct+0x55/0x590 [ 23.733976] [] rcu_process_callbacks+0x8ae/0x12b0 [ 23.740443] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 23.747079] [] ? sock_set_timeout+0x210/0x210 [ 23.753203] [] __do_softirq+0x20b/0x937 [ 23.758800] [] irq_exit+0x147/0x190 [ 23.764052] [] smp_apic_timer_interrupt+0x81/0xa0 [ 23.770512] [] apic_timer_interrupt+0xa0/0xb0 [ 23.776630] [ 23.778668] [] ? native_safe_halt+0x6/0x10 [ 23.784542] [] default_idle+0x55/0x360 [ 23.790051] [] arch_cpu_idle+0x10/0x20 [ 23.795558] [] default_idle_call+0x45/0x60 [ 23.801424] [] cpu_startup_entry+0x2b5/0x380 [ 23.807464] [] ? cpu_in_idle+0x20/0x20 [ 23.812983] [] rest_init+0x183/0x189 [ 23.818326] [] start_kernel+0x67e/0x6b2 [ 23.823930] [] ? thread_stack_cache_init+0xb/0xb [ 23.830328] [] ? x86_family+0x32/0x40 [ 23.835758] [] ? early_idt_handler_array+0x120/0x120 [ 23.842488] [] x86_64_start_reservations+0x29/0x2b [ 23.849039] [] x86_64_start_kernel+0x13f/0x162 [ 23.855948] Dumping ftrace buffer: [ 23.859502] (ftrace buffer empty) [ 23.863182] Kernel Offset: disabled [ 23.866790] Rebooting in 86400 seconds..