[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   21.145506] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   26.553016] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available)
[   26.948340] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available)
[   27.576106] random: sshd: uninitialized urandom read (32 bytes read, 61 bits of entropy available)
[   38.208424] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available)
Warning: Permanently added '10.128.0.10' (ECDSA) to the list of known hosts.
[   43.795967] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available)
2018/08/22 05:13:05 parsed 1 programs
[   45.531640] random: cc1: uninitialized urandom read (8 bytes read, 76 bits of entropy available)
2018/08/22 05:13:07 executed programs: 0
[   46.715193] IPVS: Creating netns size=2552 id=1
[   46.953191] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   46.968384] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   47.049890] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   47.066499] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   47.147967] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   47.162546] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   47.180215] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   47.195852] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   47.240256] ip (3951) used greatest stack depth: 23200 bytes left
[   47.925055] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   47.962556] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   48.314320] hrtimer: interrupt took 18478 ns
[   48.418796] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   48.427079] IP: [<ffffffff835a93b8>] l2tp_session_create+0x948/0x1030
[   48.433765] PGD 1d8e31067 PUD 1cb5d9067 PMD 0 
[   48.438674] Oops: 0002 [#1] PREEMPT SMP KASAN
[   48.443614] Dumping ftrace buffer:
[   48.447127]    (ftrace buffer empty)
[   48.450810] Modules linked in:
[   48.454091] CPU: 0 PID: 4253 Comm: syz-executor0 Not tainted 4.4.150-g5541782 #19
[   48.461679] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   48.471012] task: ffff8801d70f6000 task.stack: ffff8801d68a0000
[   48.477041] RIP: 0010:[<ffffffff835a93b8>]  [<ffffffff835a93b8>] l2tp_session_create+0x948/0x1030
[   48.486151] RSP: 0018:ffff8801d68a7ad0  EFLAGS: 00010246
[   48.491576] RAX: 0000000000000000 RBX: ffff8800b3adb900 RCX: 0000000000000006
[   48.499274] RDX: 1ffff1001675b750 RSI: ffffffff835a3493 RDI: ffff8800b3adba80
[   48.506519] RBP: ffff8801d68a7b40 R08: ffff8801d70f6900 R09: 0000000000000000
[   48.513768] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801da1a80a8
[   48.521012] R13: ffff8801d68a7c58 R14: ffff8801da1a8000 R15: ffffffff835a20c0
[   48.528260] FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f776cb40
[   48.536462] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   48.542315] CR2: 0000000000000080 CR3: 00000001cc4db000 CR4: 00000000001606f0
[   48.549560] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   48.556802] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   48.564044] Stack:
[   48.566163]  ffffffff8114094a ffff8800b3adb920 ffff8801da1a8158 ffff8801da1a8010
[   48.574168]  ffffffff838caa10 ffff8801da1a80b0 ffff8801da1a8150 ffff8800b3adb9e0
[   48.582147]  ffffffff00000000 ffff8800b96ae600 0000000000000000 ffff8800b96ae630
[   48.590160] Call Trace:
[   48.592723]  [<ffffffff8114094a>] ? __local_bh_enable_ip+0x6a/0xd0
[   48.599017]  [<ffffffff838caa10>] ? _raw_read_unlock_bh+0x30/0x40
[   48.605229]  [<ffffffff835ad7b0>] pppol2tp_connect+0x10f0/0x1910
[   48.611558]  [<ffffffff835ac6c0>] ? pppol2tp_recv+0x320/0x320
[   48.617544]  [<ffffffff81c55f5f>] ? security_socket_connect+0x8f/0xc0
[   48.624198]  [<ffffffff82f266a8>] SYSC_connect+0x1b8/0x300
[   48.629872]  [<ffffffff82f264f0>] ? SYSC_bind+0x280/0x280
[   48.635392]  [<ffffffff8157ee30>] ? get_unused_fd_flags+0xd0/0xd0
[   48.641597]  [<ffffffff812d5890>] ? compat_SyS_get_robust_list+0x310/0x310
[   48.648586]  [<ffffffff82f28711>] ? SyS_socket+0x121/0x1b0
[   48.654185]  [<ffffffff82f285f0>] ? move_addr_to_kernel+0x50/0x50
[   48.660392]  [<ffffffff82f28fe4>] SyS_connect+0x24/0x30
[   48.666115]  [<ffffffff82f28fc0>] ? SyS_accept+0x30/0x30
[   48.671548]  [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0
[   48.677728]  [<ffffffff838cca03>] sysenter_flags_fixed+0xd/0x1a
[   48.683760] 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 
[   48.710494] RIP  [<ffffffff835a93b8>] l2tp_session_create+0x948/0x1030
[   48.717379]  RSP <ffff8801d68a7ad0>
[   48.721083] CR2: 0000000000000080
[   48.725773] ---[ end trace f29d039cac28fe18 ]---
[   48.730514] Kernel panic - not syncing: Fatal exception
[   48.736252] Dumping ftrace buffer:
[   48.739811]    (ftrace buffer empty)
[   48.743502] Kernel Offset: disabled
[   48.747191] Rebooting in 86400 seconds..