[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   21.725043] 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: [   26.359912] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available)
[   26.941345] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available)
[   27.665718] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available)
[   34.258975] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available)
Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts.
[   39.914162] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available)
2018/08/22 16:02:51 parsed 1 programs
[   41.692931] random: cc1: uninitialized urandom read (8 bytes read, 78 bits of entropy available)
2018/08/22 16:02:54 executed programs: 0
[   43.290473] IPVS: Creating netns size=2552 id=1
[   43.536335] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   43.552183] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   43.634500] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   43.650235] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   43.734950] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   43.751109] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   43.767433] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   43.784413] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   43.824940] ip (3874) used greatest stack depth: 24432 bytes left
[   44.519863] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   44.557864] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   44.855244] hrtimer: interrupt took 10747 ns
[   44.924476] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   44.932734] IP: [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030
[   44.939480] PGD b5b4c067 PUD b5b4d067 PMD 0 
[   44.944289] Oops: 0002 [#1] PREEMPT SMP KASAN
[   44.949238] Dumping ftrace buffer:
[   44.952751]    (ftrace buffer empty)
[   44.956487] Modules linked in:
[   44.959785] CPU: 1 PID: 4146 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #20
[   44.967430] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   44.976828] task: ffff8800bb399800 task.stack: ffff8800afce0000
[   44.982866] RIP: 0010:[<ffffffff835aa438>]  [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030
[   44.991980] RSP: 0018:ffff8800afce7ad0  EFLAGS: 00010246
[   44.997410] RAX: 0000000000000000 RBX: ffff8801ce14f180 RCX: 0000000000000006
[   45.004659] RDX: 1ffff10039c29e60 RSI: ffffffff835a4543 RDI: ffff8801ce14f300
[   45.011956] RBP: ffff8800afce7b40 R08: ffff8800bb39a100 R09: 0000000000000000
[   45.019214] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801d92874a8
[   45.026469] R13: ffff8800afce7c58 R14: ffff8801d9287400 R15: ffffffff835a3170
[   45.033726] FS:  0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f77d1b40
[   45.041985] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   45.047900] CR2: 0000000000000080 CR3: 00000000babf2000 CR4: 00000000001606f0
[   45.055157] Stack:
[   45.057340]  ffffffff81140a6a ffff8801ce14f1a0 ffff8801d9287558 ffff8801d9287410
[   45.065340]  ffffffff838cba90 ffff8801d92874b0 ffff8801d9287550 ffff8801ce14f260
[   45.073350]  ffffffff00000000 ffff8800baa64400 0000000000000000 ffff8800baa64430
[   45.081400] Call Trace:
[   45.083967]  [<ffffffff81140a6a>] ? __local_bh_enable_ip+0x6a/0xd0
[   45.090359]  [<ffffffff838cba90>] ? _raw_read_unlock_bh+0x30/0x40
[   45.096701]  [<ffffffff835ae830>] pppol2tp_connect+0x10f0/0x1910
[   45.102828]  [<ffffffff835ad740>] ? pppol2tp_recv+0x320/0x320
[   45.108745]  [<ffffffff81c5700f>] ? security_socket_connect+0x8f/0xc0
[   45.115312]  [<ffffffff82f27758>] SYSC_connect+0x1b8/0x300
[   45.120967]  [<ffffffff82f275a0>] ? SYSC_bind+0x280/0x280
[   45.126497]  [<ffffffff8157fdd0>] ? get_unused_fd_flags+0xd0/0xd0
[   45.132714]  [<ffffffff812d59b0>] ? compat_SyS_get_robust_list+0x310/0x310
[   45.139713]  [<ffffffff82f297c1>] ? SyS_socket+0x121/0x1b0
[   45.145321]  [<ffffffff82f296a0>] ? move_addr_to_kernel+0x50/0x50
[   45.151540]  [<ffffffff82f2a094>] SyS_connect+0x24/0x30
[   45.156883]  [<ffffffff82f2a070>] ? SyS_accept+0x30/0x30
[   45.162361]  [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0
[   45.168545]  [<ffffffff838cda83>] sysenter_flags_fixed+0xd/0x1a
[   45.174579] 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 
[   45.201603] RIP  [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030
[   45.208419]  RSP <ffff8800afce7ad0>
[   45.212020] CR2: 0000000000000080
[   45.217254] ---[ end trace 17fb28e2e8979765 ]---
[   45.222055] Kernel panic - not syncing: Fatal exception
[   45.227663] Dumping ftrace buffer:
[   45.231180]    (ftrace buffer empty)
[   45.234867] Kernel Offset: disabled
[   45.238470] Rebooting in 86400 seconds..