[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   20.641780] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   25.853789] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available)
[   26.377149] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available)
[   27.080721] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available)
[   38.195804] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available)
Warning: Permanently added '10.128.10.14' (ECDSA) to the list of known hosts.
[   43.720426] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available)
2018/08/22 17:15:39 parsed 1 programs
[   45.934291] random: cc1: uninitialized urandom read (8 bytes read, 87 bits of entropy available)
2018/08/22 17:15:43 executed programs: 0
[   47.579080] IPVS: Creating netns size=2552 id=1
[   47.826275] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   47.840625] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   47.923045] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   47.937462] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   48.018964] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   48.035278] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   48.051199] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   48.069469] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   48.113702] ip (3842) used greatest stack depth: 23200 bytes left
[   48.819236] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   48.863510] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   49.160143] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   49.168408] IP: [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030
[   49.175283] PGD b1521067 PUD b0f05067 PMD 0 
[   49.180076] Oops: 0002 [#1] PREEMPT SMP KASAN
[   49.185207] Dumping ftrace buffer:
[   49.188735]    (ftrace buffer empty)
[   49.192454] Modules linked in:
[   49.195765] CPU: 0 PID: 4098 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #20
[   49.203364] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   49.212707] task: ffff8800ba50b000 task.stack: ffff8800bb3d0000
[   49.218747] RIP: 0010:[<ffffffff835aa438>]  [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030
[   49.228244] RSP: 0018:ffff8800bb3d7ad0  EFLAGS: 00010246
[   49.233692] RAX: 0000000000000000 RBX: ffff8800b152d680 RCX: 0000000000000006
[   49.240949] RDX: 1ffff100162a5b00 RSI: ffffffff835a4543 RDI: ffff8800b152d800
[   49.248206] RBP: ffff8800bb3d7b40 R08: ffff8800ba50b900 R09: 0000000000000000
[   49.255462] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8800b152d228
[   49.262722] R13: ffff8800bb3d7c58 R14: ffff8800b152d180 R15: ffffffff835a3170
[   49.269992] FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f779fb40
[   49.278222] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   49.284096] CR2: 0000000000000080 CR3: 00000000bb147000 CR4: 00000000001606f0
[   49.291364] Stack:
[   49.293497]  ffffffff81140a6a ffff8800b152d6a0 ffff8800b152d2d8 ffff8800b152d190
[   49.301835]  ffffffff838cba90 ffff8800b152d230 ffff8800b152d2d0 ffff8800b152d760
[   49.309883]  ffffffff00000000 ffff8800bae5e600 0000000000000000 ffff8800bae5e630
[   49.318077] Call Trace:
[   49.320673]  [<ffffffff81140a6a>] ? __local_bh_enable_ip+0x6a/0xd0
[   49.327029]  [<ffffffff838cba90>] ? _raw_read_unlock_bh+0x30/0x40
[   49.333250]  [<ffffffff835ae830>] pppol2tp_connect+0x10f0/0x1910
[   49.339379]  [<ffffffff835ad740>] ? pppol2tp_recv+0x320/0x320
[   49.345254]  [<ffffffff81c5700f>] ? security_socket_connect+0x8f/0xc0
[   49.351818]  [<ffffffff82f27758>] SYSC_connect+0x1b8/0x300
[   49.357434]  [<ffffffff82f275a0>] ? SYSC_bind+0x280/0x280
[   49.362958]  [<ffffffff8157fdd0>] ? get_unused_fd_flags+0xd0/0xd0
[   49.369249]  [<ffffffff812d59b0>] ? compat_SyS_get_robust_list+0x310/0x310
[   49.376262]  [<ffffffff82f297c1>] ? SyS_socket+0x121/0x1b0
[   49.381878]  [<ffffffff82f296a0>] ? move_addr_to_kernel+0x50/0x50
[   49.388101]  [<ffffffff82f2a094>] SyS_connect+0x24/0x30
[   49.393615]  [<ffffffff82f2a070>] ? SyS_accept+0x30/0x30
[   49.399165]  [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0
[   49.405297]  [<ffffffff838cda83>] sysenter_flags_fixed+0xd/0x1a
[   49.411336] 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 
[   49.439749] RIP  [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030
[   49.446550]  RSP <ffff8800bb3d7ad0>
[   49.450160] CR2: 0000000000000080
[   49.457357] ---[ end trace 7f78576872f6fb64 ]---
[   49.462493] Kernel panic - not syncing: Fatal exception
[   49.468407] Dumping ftrace buffer:
[   49.471939]    (ftrace buffer empty)
[   49.475734] Kernel Offset: disabled
[   49.479352] Rebooting in 86400 seconds..