[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   22.749678] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   28.450492] random: sshd: uninitialized urandom read (32 bytes read, 43 bits of entropy available)
[   28.867268] random: sshd: uninitialized urandom read (32 bytes read, 43 bits of entropy available)
[   29.625309] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available)
[   29.802150] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available)
Warning: Permanently added '10.128.10.35' (ECDSA) to the list of known hosts.
[   35.429900] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available)
2018/08/22 05:11:14 parsed 1 programs
[   36.641802] random: cc1: uninitialized urandom read (8 bytes read, 83 bits of entropy available)
2018/08/22 05:11:16 executed programs: 0
[   38.045044] IPVS: Creating netns size=2552 id=1
[   38.290034] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   38.306480] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   38.389594] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   38.404044] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   38.486597] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   38.501476] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   38.517450] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   38.535491] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   39.278791] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   39.318452] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   39.646450] hrtimer: interrupt took 15908 ns
[   39.820185] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   39.828780] IP: [<ffffffff835a93b8>] l2tp_session_create+0x948/0x1030
[   39.835462] PGD 1d88df067 PUD 1d8cf0067 PMD 0 
[   39.840389] Oops: 0002 [#1] PREEMPT SMP KASAN
[   39.845339] Dumping ftrace buffer:
[   39.848963]    (ftrace buffer empty)
[   39.852733] Modules linked in:
[   39.856028] CPU: 0 PID: 4285 Comm: syz-executor0 Not tainted 4.4.150-g5541782 #83
[   39.863682] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   39.873175] task: ffff8801d6834800 task.stack: ffff8801d6d98000
[   39.879204] RIP: 0010:[<ffffffff835a93b8>]  [<ffffffff835a93b8>] l2tp_session_create+0x948/0x1030
[   39.888460] RSP: 0018:ffff8801d6d9fb48  EFLAGS: 00010246
[   39.893887] RAX: 0000000000000000 RBX: ffff8800b968f400 RCX: 0000000000000006
[   39.901135] RDX: 1ffff100172d1eb0 RSI: ffffffff835a3493 RDI: ffff8800b968f580
[   39.908382] RBP: ffff8801d6d9fbb8 R08: ffff8801d6835100 R09: 0000000000000000
[   39.915631] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8800b968f9a8
[   39.922881] R13: ffff8801d6d9fcd0 R14: ffff8800b968f900 R15: ffffffff835a20c0
[   39.930125] FS:  00007f501d752700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   39.938367] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   39.944315] CR2: 0000000000000080 CR3: 00000001d8ce0000 CR4: 00000000001606f0
[   39.951570] Stack:
[   39.953694]  ffffffff8114094a ffff8800b968f420 ffff8800b968fa58 ffff8800b968f910
[   39.961700]  ffffffff838caa10 ffff8800b968f9b0 ffff8800b968fa50 ffff8800b968f4e0
[   39.969681]  ffffffff00000000 ffff8800b915bb80 0000000000000000 ffff8800b915bbb0
[   39.977734] Call Trace:
[   39.980297]  [<ffffffff8114094a>] ? __local_bh_enable_ip+0x6a/0xd0
[   39.986594]  [<ffffffff838caa10>] ? _raw_read_unlock_bh+0x30/0x40
[   39.992805]  [<ffffffff835ad7b0>] pppol2tp_connect+0x10f0/0x1910
[   39.999061]  [<ffffffff835ac6c0>] ? pppol2tp_recv+0x320/0x320
[   40.005031]  [<ffffffff81003017>] ? trace_hardirqs_on_thunk+0x17/0x19
[   40.011590]  [<ffffffff838cbca9>] ? retint_kernel+0x2d/0x2d
[   40.017283]  [<ffffffff81c55f5f>] ? security_socket_connect+0x8f/0xc0
[   40.023841]  [<ffffffff82f266a8>] SYSC_connect+0x1b8/0x300
[   40.029443]  [<ffffffff813fced1>] ? SYSC_perf_event_open+0x211/0x2470
[   40.036073]  [<ffffffff82f264f0>] ? SYSC_bind+0x280/0x280
[   40.041604]  [<ffffffff8157ee30>] ? get_unused_fd_flags+0xd0/0xd0
[   40.047889]  [<ffffffff812d4f60>] ? do_futex+0x17f0/0x17f0
[   40.053493]  [<ffffffff82f285f0>] ? move_addr_to_kernel+0x50/0x50
[   40.059697]  [<ffffffff82f28fe4>] SyS_connect+0x24/0x30
[   40.065036]  [<ffffffff838cb0a5>] entry_SYSCALL_64_fastpath+0x22/0x9e
[   40.071586] Code: 00 00 48 8d bb 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 36 06 00 00 48 8b 83 80 01 00 00 <f0> ff 80 80 00 00 00 48 8d 43 20 48 89 c7 48 89 45 b0 e8 f1 13 
[   40.098742] RIP  [<ffffffff835a93b8>] l2tp_session_create+0x948/0x1030
[   40.105510]  RSP <ffff8801d6d9fb48>
[   40.109118] CR2: 0000000000000080
[   40.114219] ---[ end trace bb31986065c2e6d2 ]---
[   40.119212] Kernel panic - not syncing: Fatal exception
[   40.124829] Dumping ftrace buffer:
[   40.128351]    (ftrace buffer empty)
[   40.132037] Kernel Offset: disabled
[   40.135642] Rebooting in 86400 seconds..