[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   20.477578] 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: [   26.078672] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available)
[   26.421908] random: sshd: uninitialized urandom read (32 bytes read, 43 bits of entropy available)
[   27.080253] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available)
[   55.505241] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available)
Warning: Permanently added '10.128.10.9' (ECDSA) to the list of known hosts.
[   61.003217] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available)
2018/08/22 05:52:17 parsed 1 programs
[   62.258311] random: cc1: uninitialized urandom read (8 bytes read, 83 bits of entropy available)
2018/08/22 05:52:19 executed programs: 0
[   63.544320] IPVS: Creating netns size=2552 id=1
[   63.787498] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   63.802257] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   63.884812] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   63.899886] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   63.982875] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   63.998286] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   64.013750] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   64.029175] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   64.753397] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   64.791727] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   65.072984] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   65.100982] hrtimer: interrupt took 23269 ns
[   65.105761] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   65.145113] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   65.153502] IP: [<ffffffff835a93b8>] l2tp_session_create+0x948/0x1030
[   65.160429] PGD bad02067 PUD b984a067 PMD 0 
[   65.165209] Oops: 0002 [#1] PREEMPT SMP KASAN
[   65.170334] Dumping ftrace buffer:
[   65.173858]    (ftrace buffer empty)
[   65.177689] Modules linked in:
[   65.181013] CPU: 0 PID: 4247 Comm: syz-executor0 Not tainted 4.4.150-g5541782 #83
[   65.188618] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   65.198095] task: ffff8800b93e9800 task.stack: ffff8800b9170000
[   65.204369] RIP: 0010:[<ffffffff835a93b8>]  [<ffffffff835a93b8>] l2tp_session_create+0x948/0x1030
[   65.213568] RSP: 0018:ffff8800b9177b48  EFLAGS: 00010246
[   65.218998] RAX: 0000000000000000 RBX: ffff8801da2e0f00 RCX: 0000000000000006
[   65.226474] RDX: 1ffff1003b45c210 RSI: ffffffff835a3493 RDI: ffff8801da2e1080
[   65.233867] RBP: ffff8800b9177bb8 R08: ffff8800b93ea100 R09: 0000000000000000
[   65.241121] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801da2e19a8
[   65.248499] R13: ffff8800b9177cd0 R14: ffff8801da2e1900 R15: ffffffff835a20c0
[   65.255888] FS:  00007f77fc371700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   65.264237] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   65.270113] CR2: 0000000000000080 CR3: 00000000b9f90000 CR4: 00000000001606f0
[   65.277597] Stack:
[   65.279731]  ffffffff8114094a ffff8801da2e0f20 ffff8801da2e1a58 ffff8801da2e1910
[   65.287857]  ffffffff838caa10 ffff8801da2e19b0 ffff8801da2e1a50 ffff8801da2e0fe0
[   65.296013]  ffff880100000000 ffff8800b9211980 0000000000000000 ffff8800b92119b0
[   65.304147] Call Trace:
[   65.306721]  [<ffffffff8114094a>] ? __local_bh_enable_ip+0x6a/0xd0
[   65.313260]  [<ffffffff838caa10>] ? _raw_read_unlock_bh+0x30/0x40
[   65.319648]  [<ffffffff835ad7b0>] pppol2tp_connect+0x10f0/0x1910
[   65.325800]  [<ffffffff835ac6c0>] ? pppol2tp_recv+0x320/0x320
[   65.331689]  [<ffffffff81c55f5f>] ? security_socket_connect+0x8f/0xc0
[   65.338266]  [<ffffffff82f266a8>] SYSC_connect+0x1b8/0x300
[   65.343883]  [<ffffffff813fced1>] ? SYSC_perf_event_open+0x211/0x2470
[   65.350449]  [<ffffffff82f264f0>] ? SYSC_bind+0x280/0x280
[   65.355984]  [<ffffffff812d4f60>] ? do_futex+0x17f0/0x17f0
[   65.361765]  [<ffffffff82f285f0>] ? move_addr_to_kernel+0x50/0x50
[   65.367998]  [<ffffffff82f28fe4>] SyS_connect+0x24/0x30
[   65.373350]  [<ffffffff838cb0a5>] entry_SYSCALL_64_fastpath+0x22/0x9e
[   65.379913] 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 
[   65.408294] RIP  [<ffffffff835a93b8>] l2tp_session_create+0x948/0x1030
[   65.415344]  RSP <ffff8800b9177b48>
[   65.418950] CR2: 0000000000000080
[   65.422641] ---[ end trace 2824422474659870 ]---
[   65.428325] Kernel panic - not syncing: Fatal exception
[   65.433935] Dumping ftrace buffer:
[   65.437460]    (ftrace buffer empty)
[   65.441231] Kernel Offset: disabled
[   65.444844] Rebooting in 86400 seconds..