[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   16.702633] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   22.279705] random: sshd: uninitialized urandom read (32 bytes read)
[   22.643465] random: sshd: uninitialized urandom read (32 bytes read)
[   23.155777] random: sshd: uninitialized urandom read (32 bytes read)
[   23.298005] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.0' (ECDSA) to the list of known hosts.
[   28.882555] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/22 21:11:22 parsed 1 programs
[   29.981771] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/22 21:11:24 executed programs: 0
[   31.505714] IPVS: Creating netns size=2536 id=1
[   31.629282] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   31.641109] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   31.684958] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   31.696407] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   31.739941] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   31.751385] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   31.763231] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   31.784256] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   31.830164] ip (3924) used greatest stack depth: 23976 bytes left
[   32.290116] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   32.316324] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   32.322534] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   32.329245] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   32.605577] l2tp_core: tunl 4: sockfd_lookup(fd=5) returned -9
[   32.672117] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   32.680334] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   32.687014] PGD 1d6c3d067 [   32.689662] PUD 1d8f9c067 
PMD 0 [   32.693193] 
[   32.694823] Oops: 0002 [#1] PREEMPT SMP KASAN
[   32.699296] Dumping ftrace buffer:
[   32.702822]    (ftrace buffer empty)
[   32.706513] Modules linked in:
[   32.709799] CPU: 0 PID: 4283 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #79
[   32.717402] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   32.726738] task: ffff8801d5371800 task.stack: ffff8801b6450000
[   32.732773] RIP: 0010:[<ffffffff836c8e30>]  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   32.741890] RSP: 0018:ffff8801b6457ac0  EFLAGS: 00010246
[   32.747320] RAX: 0000000000000000 RBX: ffff8801d6ef6780 RCX: 1ffff1003aa6e41d
[   32.754747] RDX: 1ffff1003addec80 RSI: ffff8801d53720c8 RDI: ffff8801d6ef6400
[   32.761994] RBP: ffff8801b6457b60 R08: ffff8801d53720e8 R09: 0000000000000000
[   32.769241] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d6ef62d8
[   32.776491] R13: 0000000000000000 R14: ffff8801d6ef6280 R15: ffff8801b6457c78
[   32.783741] FS:  00007f117d58a700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   32.791981] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   32.797848] CR2: 0000000000000080 CR3: 00000001d76e8000 CR4: 00000000001606f0
[   32.805097] Stack:
[   32.807226]  0000000000000201 ffffffff836ca141 ffff8801b6457ae0 ffffffff81237f0d
[   32.815233]  ffff8801d6ef6280 ffff8801d6ef68d8 ffff8801d6ef62d8 ffff8801d6ef68d0
[   32.823282]  ffff8801d6ef6830 ffff8801d6ef62a0 0000000000000000 0000000000000000
[   32.831410] Call Trace:
[   32.833982]  [<ffffffff836ca141>] ? l2tp_session_get+0x1d1/0x790
[   32.840108]  [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10
[   32.846099]  [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0
[   32.852227]  [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30
[   32.858434]  [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0
[   32.864989]  [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300
[   32.870593]  [<ffffffff81238470>] ? debug_check_no_locks_freed+0x210/0x210
[   32.877582]  [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280
[   32.883094]  [<ffffffff815dbcb0>] ? get_unused_fd_flags+0xd0/0xd0
[   32.889309]  [<ffffffff812db710>] ? do_futex+0x17c0/0x17c0
[   32.895013]  [<ffffffff815dd57f>] ? SyS_dup2+0x41f/0x5e0
[   32.900446]  [<ffffffff83021224>] SyS_connect+0x24/0x30
[   32.905786]  [<ffffffff83021200>] ? SyS_accept+0x30/0x30
[   32.911219]  [<ffffffff81006316>] do_syscall_64+0x1a6/0x490
[   32.916906]  [<ffffffff83a01c93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
[   32.923814] 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 
[   32.950684] RIP  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   32.957449]  RSP <ffff8801b6457ac0>
[   32.961048] CR2: 0000000000000080
[   32.965253] ---[ end trace b2393aa0cb63299e ]---
[   32.970013] Kernel panic - not syncing: Fatal exception
[   32.975632] Dumping ftrace buffer:
[   32.979148]    (ftrace buffer empty)
[   32.982838] Kernel Offset: disabled
[   32.986439] Rebooting in 86400 seconds..