[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   13.127189] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   26.926932] random: sshd: uninitialized urandom read (32 bytes read)
[   27.658283] random: sshd: uninitialized urandom read (32 bytes read)
[   28.093448] random: sshd: uninitialized urandom read (32 bytes read)
[   99.685483] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.15' (ECDSA) to the list of known hosts.
[  105.463936] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/22 22:07:47 parsed 1 programs
[  106.845254] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/22 22:07:49 executed programs: 0
[  108.115813] IPVS: Creating netns size=2536 id=1
[  108.241129] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[  108.252816] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[  108.295049] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[  108.306257] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[  108.348953] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[  108.360257] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[  108.372008] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[  108.385371] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[  108.867700] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[  108.893103] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[  108.899210] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[  108.906464] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[  109.105177] hrtimer: interrupt took 17855 ns
[  109.272321] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[  109.280676] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[  109.287358] PGD 1d4a0d067 [  109.289999] PUD 1d3fc4067 
PMD 0 [  109.293488] 
[  109.295112] Oops: 0002 [#1] PREEMPT SMP KASAN
[  109.299581] Dumping ftrace buffer:
[  109.303099]    (ftrace buffer empty)
[  109.306790] Modules linked in:
[  109.310082] CPU: 1 PID: 4338 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #31
[  109.317682] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  109.327019] task: ffff8801d3d74800 task.stack: ffff8801d6d10000
[  109.333047] RIP: 0010:[<ffffffff836c8e30>]  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[  109.342164] RSP: 0018:ffff8801d6d17ab0  EFLAGS: 00010246
[  109.347591] RAX: 0000000000000000 RBX: ffff8801d3d8ef00 RCX: 1ffff1003a7aea1d
[  109.354836] RDX: 1ffff1003a7b1f50 RSI: ffff8801d3d750c8 RDI: ffff8801d3d8fa80
[  109.362077] RBP: ffff8801d6d17b50 R08: ffff8801d3d750e8 R09: 0000000000000000
[  109.369327] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d3d8f958
[  109.376574] R13: 0000000000000000 R14: ffff8801d3d8f900 R15: ffff8801d6d17c68
[  109.383819] FS:  0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f7750b40
[  109.392018] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[  109.397885] CR2: 0000000000000080 CR3: 00000001d3d7b000 CR4: 00000000001606f0
[  109.405205] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  109.412464] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  109.419725] Stack:
[  109.421851]  0000000000000201 ffffffff836ca141 ffff8801d6d17ad0 ffffffff81237f0d
[  109.429857]  ffff8801d3d8f900 ffff8801d3d8f058 ffff8801d3d8f958 ffff8801d3d8f050
[  109.437848]  ffff8801d3d8efb0 ffff8801d3d8f920 0000000000000000 0000000000000000
[  109.446012] Call Trace:
[  109.448578]  [<ffffffff836ca141>] ? l2tp_session_get+0x1d1/0x790
[  109.454700]  [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10
[  109.460646]  [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0
[  109.466775]  [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30
[  109.472994]  [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0
[  109.479553]  [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300
[  109.485157]  [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280
[  109.490726]  [<ffffffff812dc050>] ? compat_SyS_get_robust_list+0x310/0x310
[  109.497728]  [<ffffffff83021224>] SyS_connect+0x24/0x30
[  109.503076]  [<ffffffff83021200>] ? SyS_accept+0x30/0x30
[  109.508504]  [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870
[  109.514693]  [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c
[  109.521346]  [<ffffffff83a03390>] entry_SYSENTER_compat+0x90/0xa2
[  109.527554] Code: 00 00 49 8d be 80 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 7b 09 00 00 49 8b 86 80 01 00 00 <f0> ff 80 80 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 55 d0 
[  109.554688] RIP  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[  109.561456]  RSP <ffff8801d6d17ab0>
[  109.565062] CR2: 0000000000000080
[  109.569921] ---[ end trace d8665ff27a5dbdda ]---
[  109.574891] Kernel panic - not syncing: Fatal exception
[  109.580586] Dumping ftrace buffer:
[  109.584107]    (ftrace buffer empty)
[  109.587803] Kernel Offset: disabled
[  109.591408] Rebooting in 86400 seconds..