[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.508553] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.312233] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.652337] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.524365] random: sshd: uninitialized urandom read (32 bytes read, 104 bits of entropy available) [ 21.703234] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) Warning: Permanently added '10.128.15.193' (ECDSA) to the list of known hosts. [ 27.090010] random: sshd: uninitialized urandom read (32 bytes read, 114 bits of entropy available) executing program [ 27.193579] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: ffffffff83307d8e [ 27.193579] [ 27.204639] CPU: 1 PID: 3316 Comm: syzkaller533052 Not tainted 4.4.112-g5f6325b #28 [ 27.212404] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.221730] 0000000000000000 aee3fa3842a34124 ffff8801d14bf790 ffffffff81d0579d [ 27.229700] ffffffff83843020 ffff8801d14bf868 000000000000ffff ffff8800b4b5b664 [ 27.237678] 0000000000000040 ffff8801d14bf858 ffffffff81419e6a 0000000041b58ab3 [ 27.245643] Call Trace: [ 27.248205] [] dump_stack+0xc1/0x124 [ 27.253539] [] panic+0x1aa/0x388 [ 27.258524] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 27.265420] [] ? ip_mc_output+0x980/0x980 [ 27.271199] [] ? ip_fragment.constprop.49+0x200/0x200 [ 27.278011] [] ? ip6_xmit+0x170e/0x1ad0 [ 27.283606] [] ? __stack_chk_fail+0xa/0x30 [ 27.289458] [] ? ip6_xmit+0x170e/0x1ad0 [ 27.295053] [] __stack_chk_fail+0x22/0x30 [ 27.300831] [] ip6_xmit+0x170e/0x1ad0 [ 27.306252] [] ? kfree+0xfc/0x300 [ 27.311326] [] ? pskb_expand_head+0x28b/0x980 [ 27.317443] [] ? l2tp_xmit_skb+0xa5e/0xea0 [ 27.323298] [] ? ip6_finish_output2+0x1c60/0x1c60 [ 27.329762] [] ? __lock_is_held+0xa1/0xf0 [ 27.335533] [] ? ipv4_dst_check+0x111/0x160 [ 27.341476] [] ? __sk_dst_check+0x148/0x260 [ 27.347415] [] ? ip6_forward_finish+0x150/0x150 [ 27.353704] [] inet6_csk_xmit+0x246/0x480 [ 27.359480] [] ? inet6_csk_xmit+0x100/0x480 [ 27.365431] [] ? inet6_csk_update_pmtu+0x160/0x160 [ 27.371983] [] ? udp6_set_csum+0x336/0xa80 [ 27.377836] [] l2tp_xmit_skb+0xc2f/0xea0 [ 27.383516] [] pppol2tp_sendmsg+0x584/0x7f0 [ 27.389465] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 27.395928] [] ? pppol2tp_release+0x310/0x310 [ 27.402042] [] sock_sendmsg+0xca/0x110 [ 27.407556] [] SYSC_sendto+0x2c8/0x340 [ 27.413062] [] ? SYSC_connect+0x310/0x310 [ 27.418831] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.424774] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 27.431756] [] ? handle_mm_fault+0x3f2/0x3190 [ 27.437872] [] ? SYSC_connect+0x212/0x310 [ 27.443645] [] ? __do_page_fault+0x380/0xa00 [ 27.449676] [] ? retint_user+0x18/0x3c [ 27.455184] [] SyS_sendto+0x40/0x50 [ 27.460429] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 27.467544] Dumping ftrace buffer: [ 27.471127] (ftrace buffer empty) [ 27.474810] Kernel Offset: disabled [ 27.478419] Rebooting in 86400 seconds..