[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 18.456055] 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: [ 19.731319] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 20.055566] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.035967] random: nonblocking pool is initialized Warning: Permanently added '10.128.10.1' (ECDSA) to the list of known hosts. 2018/03/06 20:03:43 parsed 1 programs 2018/03/06 20:03:43 executed programs: 0 [ 39.625994] IPVS: Creating netns size=2552 id=1 [ 39.669050] IPVS: Creating netns size=2552 id=2 [ 39.706734] IPVS: Creating netns size=2552 id=3 [ 39.749062] IPVS: Creating netns size=2552 id=4 [ 39.802647] IPVS: Creating netns size=2552 id=5 [ 39.845221] IPVS: Creating netns size=2552 id=6 [ 39.912791] IPVS: Creating netns size=2552 id=7 [ 39.992243] IPVS: Creating netns size=2552 id=8 2018/03/06 20:03:48 executed programs: 168 [ 45.086142] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: ffffffff8330612a [ 45.086142] [ 45.097191] CPU: 1 PID: 5657 Comm: syz-executor2 Not tainted 4.4.120-gd63fdf6 #28 [ 45.104793] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.114132] 0000000000000000 3da308da2ed2da07 ffff8800afd1f658 ffffffff81d0408d [ 45.122168] ffffffff83843960 ffff8800afd1f730 000000000000ffff ffff8800afd22d64 [ 45.130170] 0000000000000040 ffff8800afd1f720 ffffffff8141ab2a 0000000041b58ab3 [ 45.138162] Call Trace: [ 45.140721] [] dump_stack+0xc1/0x124 [ 45.146051] [] panic+0x1aa/0x388 [ 45.151037] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 45.157936] [] ? ip_mc_output+0x980/0x980 [ 45.163700] [] ? ip_fragment.constprop.49+0x200/0x200 [ 45.170509] [] ? ip6_xmit+0x16ba/0x1a70 [ 45.176101] [] ? __stack_chk_fail+0xa/0x30 [ 45.181957] [] ? ip6_xmit+0x16ba/0x1a70 [ 45.187561] [] __stack_chk_fail+0x22/0x30 [ 45.193331] [] ip6_xmit+0x16ba/0x1a70 [ 45.198752] [] ? kfree+0xfc/0x300 [ 45.203825] [] ? pskb_expand_head+0x28b/0x980 [ 45.209938] [] ? l2tp_xmit_skb+0xa5e/0xea0 [ 45.215796] [] ? ip6_finish_output2+0x1c60/0x1c60 [ 45.222261] [] ? __lock_is_held+0xa1/0xf0 [ 45.228032] [] ? ipv4_dst_check+0x111/0x160 [ 45.233972] [] ? ip6_forward_finish+0x150/0x150 [ 45.240257] [] inet6_csk_xmit+0x246/0x480 [ 45.246028] [] ? inet6_csk_xmit+0x100/0x480 [ 45.251971] [] ? inet6_csk_update_pmtu+0x160/0x160 [ 45.258530] [] ? udp6_set_csum+0x336/0xa80 [ 45.264385] [] l2tp_xmit_skb+0xc2f/0xea0 [ 45.270065] [] pppol2tp_sendmsg+0x584/0x7f0 [ 45.276009] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 45.282477] [] ? pppol2tp_release+0x310/0x310 [ 45.288596] [] sock_sendmsg+0xca/0x110 [ 45.294102] [] ___sys_sendmsg+0x6c1/0x7c0 [ 45.299868] [] ? copy_msghdr_from_user+0x550/0x550 [ 45.306415] [] ? __fget+0x213/0x3b0 [ 45.311658] [] ? __fget+0x23a/0x3b0 [ 45.316899] [] ? __fget+0x47/0x3b0 [ 45.322060] [] ? __fget_light+0xa3/0x1e0 [ 45.327744] [] ? __fdget+0x18/0x20 [ 45.332902] [] __sys_sendmsg+0xd3/0x190 [ 45.338495] [] ? SyS_shutdown+0x1b0/0x1b0 [ 45.344270] [] ? SyS_futex+0x210/0x2c0 [ 45.349785] [] ? move_addr_to_kernel+0x50/0x50 [ 45.355986] [] SyS_sendmsg+0x2d/0x50 [ 45.361318] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 45.368365] Dumping ftrace buffer: [ 45.371925] (ftrace buffer empty) [ 45.375603] Kernel Offset: disabled [ 45.379208] Rebooting in 86400 seconds..