[ 16.217883] 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: [ 21.660587] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.230086] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 23.096110] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) [ 23.266885] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) Warning: Permanently added '10.128.0.36' (ECDSA) to the list of known hosts. [ 28.932009] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) executing program [ 29.030549] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: ffffffff8330346e [ 29.030549] [ 29.041573] CPU: 0 PID: 3318 Comm: syzkaller763096 Not tainted 4.4.113-ge70c132 #27 [ 29.049343] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.058664] 0000000000000000 52810303d89020f8 ffff8800b44175d8 ffffffff81d0278d [ 29.066628] ffffffff838437c0 ffff8800b44176b0 00000000000005b4 ffff8800b11c0064 [ 29.074582] 0000000000000040 ffff8800b44176a0 ffffffff81419b6a 0000000041b58ab3 [ 29.082540] Call Trace: [ 29.085104] [] dump_stack+0xc1/0x124 [ 29.090436] [] panic+0x1aa/0x388 [ 29.095419] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 29.102311] [] ? ip_mc_output+0x980/0x980 [ 29.108078] [] ? ip_fragment.constprop.49+0x200/0x200 [ 29.114895] [] ? ip6_xmit+0x170e/0x1ad0 [ 29.120486] [] ? __stack_chk_fail+0xa/0x30 [ 29.126360] [] ? ip6_xmit+0x170e/0x1ad0 [ 29.131949] [] __stack_chk_fail+0x22/0x30 [ 29.137711] [] ip6_xmit+0x170e/0x1ad0 [ 29.143127] [] ? save_trace+0xe0/0x270 [ 29.148642] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 29.155810] [] ? ip6_finish_output2+0x1c60/0x1c60 [ 29.162271] [] ? __lock_is_held+0xa1/0xf0 [ 29.168039] [] ? ipv4_dst_check+0x111/0x160 [ 29.174154] [] ? ip6_forward_finish+0x150/0x150 [ 29.180439] [] inet6_csk_xmit+0x246/0x480 [ 29.186208] [] ? inet6_csk_xmit+0x100/0x480 [ 29.192144] [] ? inet6_csk_update_pmtu+0x160/0x160 [ 29.198691] [] ? udp6_set_csum+0x336/0xa80 [ 29.204541] [] l2tp_xmit_skb+0xc2f/0xea0 [ 29.210219] [] pppol2tp_sendmsg+0x584/0x7f0 [ 29.216159] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 29.222617] [] ? pppol2tp_release+0x310/0x310 [ 29.228731] [] sock_sendmsg+0xca/0x110 [ 29.234243] [] ___sys_sendmsg+0x6c1/0x7c0 [ 29.240010] [] ? copy_msghdr_from_user+0x550/0x550 [ 29.246555] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 29.253710] [] ? __lock_is_held+0xa1/0xf0 [ 29.259474] [] ? check_preemption_disabled+0x3b/0x200 [ 29.266284] [] ? do_huge_pmd_anonymous_page+0x549/0xa10 [ 29.273264] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 29.279982] [] ? __fget_light+0xa1/0x1e0 [ 29.285660] [] ? __fdget+0x18/0x20 [ 29.290818] [] ? sockfd_lookup_light+0x118/0x160 [ 29.297194] [] __sys_sendmsg+0xd3/0x190 [ 29.302786] [] ? SyS_shutdown+0x1b0/0x1b0 [ 29.308550] [] ? __do_page_fault+0x380/0xa00 [ 29.314575] [] compat_SyS_sendmsg+0x2a/0x40 [ 29.320514] [] ? compat_SyS_getsockopt+0x2a0/0x2a0 [ 29.327061] [] do_fast_syscall_32+0x314/0x890 [ 29.333173] [] sysenter_flags_fixed+0xd/0x17 [ 29.339734] Dumping ftrace buffer: [ 29.343293] (ftrace buffer empty) [ 29.346971] Kernel Offset: disabled [ 29.350579] Rebooting in 86400 seconds..