[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.303493] 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: [ 21.594789] random: sshd: uninitialized urandom read (32 bytes read) [ 21.906991] random: sshd: uninitialized urandom read (32 bytes read) [ 22.662105] random: sshd: uninitialized urandom read (32 bytes read) [ 22.796294] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.31' (ECDSA) to the list of known hosts. [ 28.188311] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.331612] ------------[ cut here ]------------ [ 28.336476] WARNING: CPU: 1 PID: 3801 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 28.345249] Kernel panic - not syncing: panic_on_warn set ... [ 28.345249] [ 28.352671] CPU: 1 PID: 3801 Comm: sshd Not tainted 4.9.98-gf679e4d #17 [ 28.359416] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.368766] ffff8801db307cc0 ffffffff81eb0fc9 ffffffff83c484a0 00000000ffffffff [ 28.376831] 0000000000000000 0000000000000001 00000000000000a7 ffff8801db307d80 [ 28.384867] ffffffff8141f975 0000000041b58ab3 ffffffff843b86e8 ffffffff8141f7b6 [ 28.392928] Call Trace: [ 28.395507] [ 28.397569] [] dump_stack+0xc1/0x128 [ 28.402968] [] panic+0x1bf/0x3bc [ 28.407995] [] ? add_taint.cold.6+0x16/0x16 [ 28.413966] [] ? __warn.cold.9+0xa6/0x17f [ 28.419759] [] ? inet_sock_destruct+0x598/0x760 [ 28.426086] [] __warn.cold.9+0xc1/0x17f [ 28.431739] [] warn_slowpath_null+0x2c/0x40 [ 28.437798] [] inet_sock_destruct+0x598/0x760 [ 28.443945] [] ? ipv4_mib_init_net+0x570/0x570 [ 28.450244] [] l2tp_tunnel_destruct+0x339/0x590 [ 28.456566] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 28.463080] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 28.469592] [] __sk_destruct+0x55/0x590 [ 28.475230] [] rcu_process_callbacks+0x8ae/0x12b0 [ 28.481917] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 28.488588] [] ? sock_set_timeout+0x210/0x210 [ 28.494737] [] __do_softirq+0x20b/0x937 [ 28.500365] [] irq_exit+0x147/0x190 [ 28.505653] [] smp_apic_timer_interrupt+0x81/0xa0 [ 28.512163] [] apic_timer_interrupt+0xa0/0xb0 [ 28.518297] [ 28.520378] [] ? nf_ct_deliver_cached_events+0x6a/0x560 [ 28.527438] [] ? __rcu_read_lock+0xf/0x50 [ 28.533249] [] nf_ct_deliver_cached_events+0x90/0x560 [ 28.540108] [] ? nf_ct_expect_unregister_notifier+0x100/0x100 [ 28.547657] [] ipv4_confirm+0x2bd/0x400 [ 28.553295] [] nf_iterate+0x126/0x310 [ 28.558763] [] nf_hook_slow+0x114/0x1e0 [ 28.564395] [] ? nf_iterate+0x310/0x310 [ 28.570022] [] ? __lock_is_held+0xa2/0xf0 [ 28.575815] [] ip_output+0x3eb/0x550 [ 28.581176] [] ? ip_output+0x256/0x550 [ 28.586727] [] ? ip_mc_output+0xd50/0xd50 [ 28.592536] [] ? depot_save_stack+0x132/0x460 [ 28.598684] [] ? ip_fragment.constprop.56+0x200/0x200 [ 28.605527] [] ip_local_out+0x9b/0x180 [ 28.611083] [] ip_queue_xmit+0x897/0x1b60 [ 28.616899] [] ? ip_queue_xmit+0x3e/0x1b60 [ 28.622796] [] ? __tcp_v4_send_check+0x1c4/0x360 [ 28.629211] [] tcp_transmit_skb+0x168c/0x2e30 [ 28.635366] [] ? bictcp_cong_avoid+0xdf0/0xdf0 [ 28.641609] [] ? __tcp_select_window+0x510/0x510 [ 28.648028] [] ? __lock_is_held+0xa2/0xf0 [ 28.653843] [] tcp_write_xmit+0x10cb/0x4c40 [ 28.659818] [] ? check_stack_object+0x60/0x150 [ 28.666048] [] __tcp_push_pending_frames+0xa0/0x240 [ 28.672723] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 28.679572] [] tcp_push+0x3fe/0x5e0 [ 28.684858] [] tcp_sendmsg+0x1110/0x2ff0 [ 28.690582] [] ? tcp_sendpage+0x1960/0x1960 [ 28.696562] [] ? sock_has_perm+0x292/0x3e0 [ 28.702454] [] ? sock_has_perm+0x9f/0x3e0 [ 28.708259] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 28.715383] [] ? inet_sendmsg+0x143/0x4d0 [ 28.721182] [] inet_sendmsg+0x203/0x4d0 [ 28.726812] [] ? inet_sendmsg+0x73/0x4d0 [ 28.732544] [] ? inet_recvmsg+0x4c0/0x4c0 [ 28.738355] [] sock_sendmsg+0xcc/0x110 [ 28.743894] [] sock_write_iter+0x223/0x3b0 [ 28.749779] [] ? sock_sendmsg+0x110/0x110 [ 28.755582] [] ? iov_iter_init+0xaf/0x1d0 [ 28.761387] [] __vfs_write+0x3e0/0x580 [ 28.766927] [] ? default_llseek+0x280/0x280 [ 28.772903] [] ? selinux_file_permission+0x82/0x470 [ 28.779586] [] ? rw_verify_area+0xe5/0x2b0 [ 28.785477] [] vfs_write+0x187/0x530 [ 28.790835] [] SyS_write+0xd9/0x1c0 [ 28.796108] [] ? SyS_read+0x1c0/0x1c0 [ 28.801571] [] ? do_syscall_64+0x48/0x490 [ 28.807380] [] ? SyS_read+0x1c0/0x1c0 [ 28.812835] [] do_syscall_64+0x1a6/0x490 [ 28.818573] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 28.826146] Dumping ftrace buffer: [ 28.829757] (ftrace buffer empty) [ 28.833454] Kernel Offset: disabled [ 28.837069] Rebooting in 86400 seconds..