[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.086857] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.382643] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.869464] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.784316] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) [ 25.954731] random: sshd: uninitialized urandom read (32 bytes read, 113 bits of entropy available) Warning: Permanently added '10.128.0.2' (ECDSA) to the list of known hosts. [ 31.388666] random: sshd: uninitialized urandom read (32 bytes read, 121 bits of entropy available) executing program [ 31.480586] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: ffffffff8330612a [ 31.480586] [ 31.491662] CPU: 1 PID: 3780 Comm: syzkaller627965 Not tainted 4.4.120-gd63fdf6 #28 [ 31.499424] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.508750] 0000000000000000 0c696bf74307de2d ffff8800bb0d7790 ffffffff81d0408d [ 31.516718] ffffffff83843960 ffff8800bb0d7868 00000000000005b4 ffff8801ccbdb664 [ 31.524680] 0000000000000040 ffff8800bb0d7858 ffffffff8141ab2a 0000000041b58ab3 [ 31.532638] Call Trace: [ 31.535196] [] dump_stack+0xc1/0x124 [ 31.540527] [] panic+0x1aa/0x388 [ 31.545512] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 31.552411] [] ? ip_mc_output+0x980/0x980 [ 31.558175] [] ? ip_fragment.constprop.49+0x200/0x200 [ 31.564985] [] ? ip6_xmit+0x16ba/0x1a70 [ 31.570580] [] ? __stack_chk_fail+0xa/0x30 [ 31.576443] [] ? ip6_xmit+0x16ba/0x1a70 [ 31.582034] [] __stack_chk_fail+0x22/0x30 [ 31.587802] [] ip6_xmit+0x16ba/0x1a70 [ 31.593223] [] ? kfree+0xfc/0x300 [ 31.598296] [] ? pskb_expand_head+0x28b/0x980 [ 31.604420] [] ? l2tp_xmit_skb+0xa5e/0xea0 [ 31.610273] [] ? ip6_finish_output2+0x1c60/0x1c60 [ 31.616745] [] ? __lock_is_held+0xa1/0xf0 [ 31.622515] [] ? ipv4_dst_check+0x111/0x160 [ 31.628458] [] ? __sk_dst_check+0x148/0x260 [ 31.634402] [] ? ip6_forward_finish+0x150/0x150 [ 31.640699] [] inet6_csk_xmit+0x246/0x480 [ 31.646556] [] ? inet6_csk_xmit+0x100/0x480 [ 31.652499] [] ? inet6_csk_update_pmtu+0x160/0x160 [ 31.659048] [] ? udp6_set_csum+0x336/0xa80 [ 31.664905] [] l2tp_xmit_skb+0xc2f/0xea0 [ 31.670588] [] pppol2tp_sendmsg+0x584/0x7f0 [ 31.676531] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 31.682998] [] ? pppol2tp_release+0x310/0x310 [ 31.689111] [] sock_sendmsg+0xca/0x110 [ 31.694616] [] SYSC_sendto+0x2c8/0x340 [ 31.700120] [] ? SYSC_connect+0x310/0x310 [ 31.705886] [] ? lock_sock_nested+0xdc/0x120 [ 31.711923] [] ? ip6_datagram_connect+0x3a/0x50 [ 31.718211] [] ? inet_dgram_connect+0x172/0x1f0 [ 31.724497] [] ? SYSC_connect+0x212/0x310 [ 31.730277] [] ? retint_user+0x18/0x3c [ 31.735785] [] SyS_sendto+0x40/0x50 [ 31.741040] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 31.748091] Dumping ftrace buffer: [ 31.751637] (ftrace buffer empty) [ 31.755316] Kernel Offset: disabled [ 31.758923] Rebooting in 86400 seconds..