[ 20.456298] 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: [ 24.733964] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.939053] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 25.864213] random: sshd: uninitialized urandom read (32 bytes read, 114 bits of entropy available) [ 41.347406] random: sshd: uninitialized urandom read (32 bytes read, 124 bits of entropy available) Warning: Permanently added '10.128.0.6' (ECDSA) to the list of known hosts. [ 46.743044] random: nonblocking pool is initialized executing program [ 46.834284] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: ffffffff8330612a [ 46.834284] [ 46.845310] CPU: 1 PID: 3746 Comm: syzkaller074220 Not tainted 4.4.120-gd63fdf6 #28 [ 46.853073] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.862397] 0000000000000000 a7fdacd8bb5dd201 ffff8801c84d7658 ffffffff81d0408d [ 46.870362] ffffffff83843960 ffff8801c84d7730 00000000000005b4 ffff8801cd14a464 [ 46.878327] 0000000000000040 ffff8801c84d7720 ffffffff8141ab2a 0000000041b58ab3 [ 46.886303] Call Trace: [ 46.888860] [] dump_stack+0xc1/0x124 [ 46.894196] [] panic+0x1aa/0x388 [ 46.899180] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 46.906075] [] ? ip_mc_output+0x980/0x980 [ 46.911843] [] ? ip_fragment.constprop.49+0x200/0x200 [ 46.918651] [] ? ip6_xmit+0x16ba/0x1a70 [ 46.924241] [] ? __stack_chk_fail+0xa/0x30 [ 46.930091] [] ? ip6_xmit+0x16ba/0x1a70 [ 46.935679] [] __stack_chk_fail+0x22/0x30 [ 46.941445] [] ip6_xmit+0x16ba/0x1a70 [ 46.946863] [] ? kfree+0xfc/0x300 [ 46.951932] [] ? pskb_expand_head+0x28b/0x980 [ 46.958048] [] ? l2tp_xmit_skb+0xa5e/0xea0 [ 46.963902] [] ? ip6_finish_output2+0x1c60/0x1c60 [ 46.970360] [] ? __lock_is_held+0xa1/0xf0 [ 46.976126] [] ? ipv4_dst_check+0x111/0x160 [ 46.982062] [] ? ip6_forward_finish+0x150/0x150 [ 46.988352] [] inet6_csk_xmit+0x246/0x480 [ 46.994113] [] ? inet6_csk_xmit+0x100/0x480 [ 47.000050] [] ? inet6_csk_update_pmtu+0x160/0x160 [ 47.006594] [] ? udp6_set_csum+0x336/0xa80 [ 47.012443] [] l2tp_xmit_skb+0xc2f/0xea0 [ 47.018118] [] pppol2tp_sendmsg+0x584/0x7f0 [ 47.024058] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 47.030517] [] ? pppol2tp_release+0x310/0x310 [ 47.036651] [] sock_sendmsg+0xca/0x110 [ 47.042157] [] ___sys_sendmsg+0x6c1/0x7c0 [ 47.047924] [] ? udp_v6_get_port+0xd0/0xd0 [ 47.053774] [] ? copy_msghdr_from_user+0x550/0x550 [ 47.060322] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 47.066607] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 47.073411] [] ? release_sock+0x3be/0x510 [ 47.079177] [] ? trace_hardirqs_on+0xd/0x10 [ 47.085116] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 47.091399] [] ? trace_hardirqs_on+0xd/0x10 [ 47.097336] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 47.103619] [] ? lock_sock_nested+0xdc/0x120 [ 47.109646] [] ? ip6_datagram_connect+0x3a/0x50 [ 47.115934] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 47.122650] [] ? __fget_light+0xa3/0x1e0 [ 47.128330] [] ? __fdget+0x18/0x20 [ 47.133485] [] __sys_sendmsg+0xd3/0x190 [ 47.139074] [] ? SyS_shutdown+0x1b0/0x1b0 [ 47.144844] [] ? __do_page_fault+0x380/0xa00 [ 47.150870] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 47.157674] [] SyS_sendmsg+0x2d/0x50 [ 47.163006] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 47.169978] Dumping ftrace buffer: [ 47.173517] (ftrace buffer empty) [ 47.177202] Kernel Offset: disabled [ 47.180825] Rebooting in 86400 seconds..