[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.049143] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.583418] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 20.901770] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 21.833454] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) [ 22.020571] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) Warning: Permanently added '10.128.15.205' (ECDSA) to the list of known hosts. [ 27.414325] random: sshd: uninitialized urandom read (32 bytes read, 124 bits of entropy available) executing program [ 27.510978] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: ffffffff8330346e [ 27.510978] [ 27.522017] CPU: 1 PID: 3323 Comm: syzkaller894545 Not tainted 4.4.113-gef588ef #33 [ 27.529891] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.539225] 0000000000000000 23fb24d86622fa57 ffff8800b3c77658 ffffffff81d0278d [ 27.547212] ffffffff838437c0 ffff8800b3c77730 00000000000005b4 ffff8800b4617ae4 [ 27.555194] 0000000000000040 ffff8800b3c77720 ffffffff81419b6a 0000000041b58ab3 [ 27.563214] Call Trace: [ 27.565779] [] dump_stack+0xc1/0x124 [ 27.571122] [] panic+0x1aa/0x388 [ 27.576120] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 27.583834] [] ? ip_mc_output+0x980/0x980 [ 27.589616] [] ? ip_fragment.constprop.49+0x200/0x200 [ 27.596436] [] ? ip6_xmit+0x170e/0x1ad0 [ 27.602037] [] ? __stack_chk_fail+0xa/0x30 [ 27.607907] [] ? ip6_xmit+0x170e/0x1ad0 [ 27.613506] [] __stack_chk_fail+0x22/0x30 [ 27.619283] [] ip6_xmit+0x170e/0x1ad0 [ 27.624708] [] ? save_trace+0xe0/0x270 [ 27.630224] [] ? pskb_expand_head+0x28b/0x980 [ 27.636368] [] ? ip6_finish_output2+0x1c60/0x1c60 [ 27.642848] [] ? __lock_is_held+0xa1/0xf0 [ 27.648632] [] ? ipv4_dst_check+0x111/0x160 [ 27.654582] [] ? ip6_forward_finish+0x150/0x150 [ 27.660888] [] inet6_csk_xmit+0x246/0x480 [ 27.666677] [] ? inet6_csk_xmit+0x100/0x480 [ 27.672630] [] ? inet6_csk_update_pmtu+0x160/0x160 [ 27.679202] [] ? udp6_set_csum+0x336/0xa80 [ 27.685085] [] l2tp_xmit_skb+0xc2f/0xea0 [ 27.690779] [] pppol2tp_sendmsg+0x584/0x7f0 [ 27.696732] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 27.703206] [] ? pppol2tp_release+0x310/0x310 [ 27.709330] [] sock_sendmsg+0xca/0x110 [ 27.714843] [] ___sys_sendmsg+0x6c1/0x7c0 [ 27.720630] [] ? copy_msghdr_from_user+0x550/0x550 [ 27.727204] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.734036] [] ? pagevec_lru_move_fn+0x1c5/0x250 [ 27.740443] [] ? __put_single_page+0x60/0x60 [ 27.746486] [] ? do_huge_pmd_anonymous_page+0x549/0xa10 [ 27.753496] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.759453] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 27.766460] [] ? __fdget+0x18/0x20 [ 27.771638] [] __sys_sendmsg+0xd3/0x190 [ 27.777245] [] ? SyS_shutdown+0x1b0/0x1b0 [ 27.783034] [] ? __do_page_fault+0x380/0xa00 [ 27.789098] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.795924] [] SyS_sendmsg+0x2d/0x50 [ 27.801264] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 27.808402] Dumping ftrace buffer: [ 27.812015] (ftrace buffer empty) [ 27.815703] Kernel Offset: disabled [ 27.819333] Rebooting in 86400 seconds..