[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   20.703009] 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: [   22.246072] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available)
[   22.778877] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available)
[   23.490328] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available)
[   40.603711] random: sshd: uninitialized urandom read (32 bytes read, 82 bits of entropy available)
Warning: Permanently added '10.128.10.25' (ECDSA) to the list of known hosts.
[   46.134236] random: sshd: uninitialized urandom read (32 bytes read, 84 bits of entropy available)
2018/08/22 06:12:40 parsed 1 programs
[   48.090299] random: cc1: uninitialized urandom read (8 bytes read, 86 bits of entropy available)
2018/08/22 06:12:43 executed programs: 0
[   49.580225] IPVS: Creating netns size=2552 id=1
[   49.827750] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   49.842103] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   49.925507] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   49.940191] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   50.024747] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   50.040045] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   50.055801] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   50.072946] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   50.825789] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   50.864743] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   51.221868] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   51.266097] hrtimer: interrupt took 10654 ns
[   52.007339] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   52.015576] IP: [<ffffffff835a93b8>] l2tp_session_create+0x948/0x1030
[   52.022265] PGD b918f067 PUD b91d1067 PMD 0 
[   52.027037] Oops: 0002 [#1] PREEMPT SMP KASAN
[   52.032015] Dumping ftrace buffer:
[   52.035530]    (ftrace buffer empty)
[   52.039251] Modules linked in:
[   52.042540] CPU: 0 PID: 4404 Comm: syz-executor0 Not tainted 4.4.150-g5541782 #19
[   52.050132] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   52.059458] task: ffff8801d46f6000 task.stack: ffff8800b7b50000
[   52.065507] RIP: 0010:[<ffffffff835a93b8>]  [<ffffffff835a93b8>] l2tp_session_create+0x948/0x1030
[   52.074627] RSP: 0018:ffff8800b7b57ad0  EFLAGS: 00010246
[   52.080049] RAX: 0000000000000000 RBX: ffff8801d4f64500 RCX: 0000000000000006
[   52.087312] RDX: 1ffff1003a9ec8d0 RSI: ffffffff835a3493 RDI: ffff8801d4f64680
[   52.094556] RBP: ffff8800b7b57b40 R08: ffff8801d46f6900 R09: 0000000000000000
[   52.101809] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801d4bd20a8
[   52.109052] R13: ffff8800b7b57c58 R14: ffff8801d4bd2000 R15: ffffffff835a20c0
[   52.116297] FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7706b40
[   52.124493] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   52.130363] CR2: 0000000000000080 CR3: 00000000b761a000 CR4: 00000000001606f0
[   52.137609] Stack:
[   52.139732]  ffffffff8114094a ffff8801d4f64520 ffff8801d4bd2158 ffff8801d4bd2010
[   52.147753]  ffffffff838caa10 ffff8801d4bd20b0 ffff8801d4bd2150 ffff8801d4f645e0
[   52.155756]  ffffffff00000000 ffff8801d44b4c80 0000000000000000 ffff8801d44b4cb0
[   52.163779] Call Trace:
[   52.166367]  [<ffffffff8114094a>] ? __local_bh_enable_ip+0x6a/0xd0
[   52.172660]  [<ffffffff838caa10>] ? _raw_read_unlock_bh+0x30/0x40
[   52.178866]  [<ffffffff835ad7b0>] pppol2tp_connect+0x10f0/0x1910
[   52.184983]  [<ffffffff835ac6c0>] ? pppol2tp_recv+0x320/0x320
[   52.190859]  [<ffffffff81c55f5f>] ? security_socket_connect+0x8f/0xc0
[   52.197426]  [<ffffffff82f266a8>] SYSC_connect+0x1b8/0x300
[   52.203031]  [<ffffffff82f264f0>] ? SYSC_bind+0x280/0x280
[   52.208545]  [<ffffffff8157ee30>] ? get_unused_fd_flags+0xd0/0xd0
[   52.214755]  [<ffffffff812d5890>] ? compat_SyS_get_robust_list+0x310/0x310
[   52.221755]  [<ffffffff82f28711>] ? SyS_socket+0x121/0x1b0
[   52.227352]  [<ffffffff82f285f0>] ? move_addr_to_kernel+0x50/0x50
[   52.233558]  [<ffffffff82f28fe4>] SyS_connect+0x24/0x30
[   52.238894]  [<ffffffff82f28fc0>] ? SyS_accept+0x30/0x30
[   52.244320]  [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0
[   52.250452]  [<ffffffff838cca03>] sysenter_flags_fixed+0xd/0x1a
[   52.256476] 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 
[   52.283618] RIP  [<ffffffff835a93b8>] l2tp_session_create+0x948/0x1030
[   52.290391]  RSP <ffff8800b7b57ad0>
[   52.293987] CR2: 0000000000000080
[   52.300465] ---[ end trace 391d8fc68be34c87 ]---
[   52.305531] Kernel panic - not syncing: Fatal exception
[   52.311217] Dumping ftrace buffer:
[   52.314738]    (ftrace buffer empty)
[   52.318434] Kernel Offset: disabled
[   52.322034] Rebooting in 86400 seconds..