[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   19.730896] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   24.814101] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available)
[   25.225925] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available)
[   25.968910] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available)
[   26.134027] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available)
Warning: Permanently added '10.128.10.9' (ECDSA) to the list of known hosts.
[   31.798006] random: sshd: uninitialized urandom read (32 bytes read, 86 bits of entropy available)
2018/08/29 04:32:21 parsed 1 programs
[   32.941938] random: cc1: uninitialized urandom read (8 bytes read, 88 bits of entropy available)
2018/08/29 04:32:23 executed programs: 0
[   34.051572] IPVS: Creating netns size=2552 id=1
[   34.288636] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   34.304535] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   34.383799] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   34.398226] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   34.477983] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   34.493021] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   34.509801] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   34.527321] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   35.244531] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   35.286150] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
2018/08/29 04:32:28 executed programs: 308
[   39.930984] l2tp_core: tunl 4: sockfd_lookup(fd=5) returned -9
[   40.393087] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   40.401584] IP: [<ffffffff835aab88>] l2tp_session_create+0x948/0x1030
[   40.408477] PGD b4be1067 PUD b4a88067 PMD 0 
[   40.413410] Oops: 0002 [#1] PREEMPT SMP KASAN
[   40.418526] Dumping ftrace buffer:
[   40.422059]    (ftrace buffer empty)
[   40.425763] Modules linked in:
[   40.429179] CPU: 0 PID: 5626 Comm: syz-executor0 Not tainted 4.4.153-g5e24b4e #90
[   40.436996] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   40.446657] task: ffff8801cc843000 task.stack: ffff8800b0a78000
[   40.452709] RIP: 0010:[<ffffffff835aab88>]  [<ffffffff835aab88>] l2tp_session_create+0x948/0x1030
[   40.461860] RSP: 0018:ffff8800b0a7fb48  EFLAGS: 00010246
[   40.467301] RAX: 0000000000000000 RBX: ffff8800b4ad0780 RCX: 0000000000000006
[   40.474564] RDX: 1ffff1001695a120 RSI: ffffffff835a4c93 RDI: ffff8800b4ad0900
[   40.481828] RBP: ffff8800b0a7fbb8 R08: 000000000000000a R09: 000000000000ffff
[   40.489144] R10: ffffed0039a3df38 R11: ffffffff8463a200 R12: ffff8801cd1ef9a8
[   40.496434] R13: ffff8800b0a7fcd0 R14: ffff8801cd1ef900 R15: ffffffff835a38c0
[   40.503698] FS:  00007f5dd4090700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   40.511917] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   40.517789] CR2: 0000000000000080 CR3: 00000000b1cb2000 CR4: 00000000001606f0
[   40.525059] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   40.532690] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   40.539953] Stack:
[   40.542103]  ffffffff81140aba ffff8800b4ad07a0 ffff8801cd1efa58 ffff8801cd1ef910
[   40.550270]  ffffffff838cc1e0 ffff8801cd1ef9b0 ffff8801cd1efa50 ffff8800b4ad0860
[   40.558435]  ffffffff00000000 ffff8800b42f1980 0000000000000000 ffff8800b42f19b0
[   40.566710] Call Trace:
[   40.569299]  [<ffffffff81140aba>] ? __local_bh_enable_ip+0x6a/0xd0
[   40.575615]  [<ffffffff838cc1e0>] ? _raw_read_unlock_bh+0x30/0x40
[   40.581871]  [<ffffffff835aef80>] pppol2tp_connect+0x10f0/0x1910
[   40.588013]  [<ffffffff835ade90>] ? pppol2tp_recv+0x320/0x320
[   40.593904]  [<ffffffff81c5740f>] ? security_socket_connect+0x8f/0xc0
[   40.600612]  [<ffffffff82f27ef8>] SYSC_connect+0x1b8/0x300
[   40.606259]  [<ffffffff82f27d40>] ? SYSC_bind+0x280/0x280
[   40.611959]  [<ffffffff8157ff20>] ? get_unused_fd_flags+0xd0/0xd0
[   40.618204]  [<ffffffff812d5010>] ? do_futex+0x17f0/0x17f0
[   40.623939]  [<ffffffff82f29f61>] ? SyS_socket+0x121/0x1b0
[   40.629572]  [<ffffffff82f29e40>] ? move_addr_to_kernel+0x50/0x50
[   40.635806]  [<ffffffff82f2a844>] SyS_connect+0x24/0x30
[   40.641175]  [<ffffffff838cc865>] entry_SYSCALL_64_fastpath+0x22/0x9e
[   40.647779] 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 
[   40.676245] RIP  [<ffffffff835aab88>] l2tp_session_create+0x948/0x1030
[   40.683044]  RSP <ffff8800b0a7fb48>
[   40.686781] CR2: 0000000000000080
[   40.690767] ---[ end trace 138bf6d445bee133 ]---
[   40.696122] Kernel panic - not syncing: Fatal exception
[   40.701976] Dumping ftrace buffer:
[   40.705526]    (ftrace buffer empty)
[   40.709228] Kernel Offset: disabled
[   40.712845] Rebooting in 86400 seconds..