[ 19.325855] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.569298] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.799283] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 22.749504] random: sshd: uninitialized urandom read (32 bytes read, 112 bits of entropy available) [ 36.735624] random: sshd: uninitialized urandom read (32 bytes read, 125 bits of entropy available) Warning: Permanently added '10.128.10.2' (ECDSA) to the list of known hosts. [ 42.237997] random: nonblocking pool is initialized executing program [ 42.337410] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: ffffffff8330612a [ 42.337410] [ 42.348433] CPU: 0 PID: 3664 Comm: syzkaller477599 Not tainted 4.4.120-gd63fdf6 #28 [ 42.356207] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.365558] 0000000000000000 d5210ccc1a161dfe ffff8800b0257790 ffffffff81d0408d [ 42.373528] ffffffff83843960 ffff8800b0257868 00000000000005b4 ffff8800b70bd6e4 [ 42.381502] 0000000000000040 ffff8800b0257858 ffffffff8141ab2a 0000000041b58ab3 [ 42.389475] Call Trace: [ 42.392048] [] dump_stack+0xc1/0x124 [ 42.397390] [] panic+0x1aa/0x388 [ 42.402375] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 42.409272] [] ? ip_mc_output+0x980/0x980 [ 42.415036] [] ? ip_fragment.constprop.49+0x200/0x200 [ 42.421842] [] ? ip6_xmit+0x16ba/0x1a70 [ 42.427439] [] ? __stack_chk_fail+0xa/0x30 [ 42.433291] [] ? ip6_xmit+0x16ba/0x1a70 [ 42.438885] [] __stack_chk_fail+0x22/0x30 [ 42.444652] [] ip6_xmit+0x16ba/0x1a70 [ 42.450081] [] ? kfree+0xfc/0x300 [ 42.455152] [] ? pskb_expand_head+0x28b/0x980 [ 42.461264] [] ? l2tp_xmit_skb+0xa5e/0xea0 [ 42.467119] [] ? ip6_finish_output2+0x1c60/0x1c60 [ 42.473580] [] ? __lock_is_held+0xa1/0xf0 [ 42.479346] [] ? ipv4_dst_check+0x111/0x160 [ 42.485288] [] ? __sk_dst_check+0x148/0x260 [ 42.491227] [] ? ip6_forward_finish+0x150/0x150 [ 42.497513] [] inet6_csk_xmit+0x246/0x480 [ 42.503277] [] ? inet6_csk_xmit+0x100/0x480 [ 42.509223] [] ? inet6_csk_update_pmtu+0x160/0x160 [ 42.515770] [] ? udp6_set_csum+0x336/0xa80 [ 42.521910] [] l2tp_xmit_skb+0xc2f/0xea0 [ 42.527587] [] pppol2tp_sendmsg+0x584/0x7f0 [ 42.533530] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 42.539989] [] ? pppol2tp_release+0x310/0x310 [ 42.546111] [] sock_sendmsg+0xca/0x110 [ 42.551616] [] SYSC_sendto+0x2c8/0x340 [ 42.557123] [] ? SYSC_connect+0x310/0x310 [ 42.562891] [] ? lock_sock_nested+0xdc/0x120 [ 42.568928] [] ? ip6_datagram_connect+0x3a/0x50 [ 42.575216] [] ? inet_dgram_connect+0x172/0x1f0 [ 42.581504] [] ? SYSC_connect+0x212/0x310 [ 42.587269] [] ? retint_user+0x18/0x3c [ 42.592790] [] SyS_sendto+0x40/0x50 [ 42.598046] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 42.605060] Dumping ftrace buffer: [ 42.608618] (ftrace buffer empty) [ 42.612297] Kernel Offset: disabled [ 42.615906] Rebooting in 86400 seconds..