[ 15.306796] 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: [ 20.561299] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 20.789645] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.708687] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) [ 21.888669] random: sshd: uninitialized urandom read (32 bytes read, 114 bits of entropy available) Warning: Permanently added '10.128.15.225' (ECDSA) to the list of known hosts. [ 27.298801] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available) executing program [ 27.402210] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: ffffffff8330346e [ 27.402210] [ 27.413227] CPU: 0 PID: 3310 Comm: syzkaller272376 Not tainted 4.4.113-ge70c132 #34 [ 27.420990] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.430574] 0000000000000000 d9a1b6a9f263c4e2 ffff8801d1287658 ffffffff81d0278d [ 27.438548] ffffffff838437c0 ffff8801d1287730 00000000000005b4 ffff8800b1b00064 [ 27.446512] 0000000000000040 ffff8801d1287720 ffffffff81419b6a 0000000041b58ab3 [ 27.454476] Call Trace: [ 27.457037] [] dump_stack+0xc1/0x124 [ 27.462372] [] panic+0x1aa/0x388 [ 27.467356] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 27.474254] [] ? ip_mc_output+0x980/0x980 [ 27.480626] [] ? ip_fragment.constprop.49+0x200/0x200 [ 27.487432] [] ? ip6_xmit+0x170e/0x1ad0 [ 27.493023] [] ? __stack_chk_fail+0xa/0x30 [ 27.498878] [] ? ip6_xmit+0x170e/0x1ad0 [ 27.504473] [] __stack_chk_fail+0x22/0x30 [ 27.510248] [] ip6_xmit+0x170e/0x1ad0 [ 27.515668] [] ? save_trace+0xe0/0x270 [ 27.521176] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 27.528333] [] ? ip6_finish_output2+0x1c60/0x1c60 [ 27.534794] [] ? __lock_is_held+0xa1/0xf0 [ 27.540558] [] ? ipv4_dst_check+0x111/0x160 [ 27.546500] [] ? ip6_forward_finish+0x150/0x150 [ 27.552790] [] inet6_csk_xmit+0x246/0x480 [ 27.558553] [] ? inet6_csk_xmit+0x100/0x480 [ 27.564491] [] ? inet6_csk_update_pmtu+0x160/0x160 [ 27.571037] [] ? udp6_set_csum+0x336/0xa80 [ 27.576893] [] l2tp_xmit_skb+0xc2f/0xea0 [ 27.582572] [] pppol2tp_sendmsg+0x584/0x7f0 [ 27.588515] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 27.594976] [] ? pppol2tp_release+0x310/0x310 [ 27.601101] [] sock_sendmsg+0xca/0x110 [ 27.606605] [] ___sys_sendmsg+0x6c1/0x7c0 [ 27.612371] [] ? copy_msghdr_from_user+0x550/0x550 [ 27.618920] [] ? check_preemption_disabled+0x3b/0x200 [ 27.625729] [] ? do_huge_pmd_anonymous_page+0x549/0xa10 [ 27.632712] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.638661] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 27.645642] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 27.652363] [] ? __fget_light+0xa1/0x1e0 [ 27.658041] [] ? __fdget+0x18/0x20 [ 27.663200] [] __sys_sendmsg+0xd3/0x190 [ 27.668792] [] ? SyS_shutdown+0x1b0/0x1b0 [ 27.674563] [] ? __do_page_fault+0x380/0xa00 [ 27.680589] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.687404] [] SyS_sendmsg+0x2d/0x50 [ 27.692735] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 27.699789] Dumping ftrace buffer: [ 27.703333] (ftrace buffer empty) [ 27.707013] Kernel Offset: disabled [ 27.710624] Rebooting in 86400 seconds..