[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.855363] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.397490] random: sshd: uninitialized urandom read (32 bytes read) [ 20.762841] random: sshd: uninitialized urandom read (32 bytes read) [ 21.683415] random: sshd: uninitialized urandom read (32 bytes read) [ 21.808995] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.60' (ECDSA) to the list of known hosts. [ 27.320584] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 27.539586] ------------[ cut here ]------------ [ 27.544386] WARNING: CPU: 1 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 27.552870] Kernel panic - not syncing: panic_on_warn set ... [ 27.552870] [ 27.560228] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.113-g7f6f94c #61 [ 27.567267] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.576603] ffff8801db307cc0 ffffffff81eb32c9 ffffffff83c48980 00000000ffffffff [ 27.584596] 0000000000000000 0000000000000001 00000000000000a7 ffff8801db307d80 [ 27.592589] ffffffff81421a75 0000000041b58ab3 ffffffff843bb788 ffffffff814218b6 [ 27.600580] Call Trace: [ 27.603134] [ 27.605179] [] dump_stack+0xc1/0x128 [ 27.610537] [] panic+0x1bf/0x3bc [ 27.615535] [] ? add_taint.cold.6+0x16/0x16 [ 27.621480] [] ? __warn.cold.9+0xa6/0x17f [ 27.627253] [] ? inet_sock_destruct+0x598/0x760 [ 27.633561] [] __warn.cold.9+0xc1/0x17f [ 27.639173] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 27.645660] [] warn_slowpath_null+0x2c/0x40 [ 27.651621] [] inet_sock_destruct+0x598/0x760 [ 27.657777] [] ? ipv4_mib_init_net+0x570/0x570 [ 27.663990] [] l2tp_tunnel_destruct+0x339/0x590 [ 27.670297] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 27.676771] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 27.683248] [] __sk_destruct+0x55/0x590 [ 27.688853] [] rcu_process_callbacks+0x8ae/0x12b0 [ 27.695344] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 27.701994] [] ? sock_set_timeout+0x210/0x210 [ 27.708127] [] __do_softirq+0x20b/0x937 [ 27.713752] [] irq_exit+0x147/0x190 [ 27.719011] [] smp_apic_timer_interrupt+0x81/0xa0 [ 27.725480] [] apic_timer_interrupt+0xa0/0xb0 [ 27.731594] [ 27.733644] [] ? native_safe_halt+0x6/0x10 [ 27.739521] [] ? trace_hardirqs_on+0xd/0x10 [ 27.745470] [] default_idle+0x55/0x360 [ 27.750982] [] arch_cpu_idle+0x10/0x20 [ 27.756492] [] default_idle_call+0x45/0x60 [ 27.762349] [] cpu_startup_entry+0x2b5/0x380 [ 27.768385] [] ? cpu_in_idle+0x20/0x20 [ 27.773899] [] start_secondary+0x328/0x400 [ 27.779757] [] ? set_cpu_sibling_map+0x1300/0x1300 [ 27.787071] Dumping ftrace buffer: [ 27.790655] (ftrace buffer empty) [ 27.794359] Kernel Offset: disabled [ 27.797968] Rebooting in 86400 seconds..