[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   18.066443] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   23.064351] random: sshd: uninitialized urandom read (32 bytes read)
[   23.506361] random: sshd: uninitialized urandom read (32 bytes read)
[   24.038581] random: sshd: uninitialized urandom read (32 bytes read)
[   24.194692] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.19' (ECDSA) to the list of known hosts.
[   29.798635] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/23 03:43:53 parsed 1 programs
[   31.050222] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/23 03:43:55 executed programs: 0
[   32.192497] IPVS: Creating netns size=2536 id=1
[   32.320000] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   32.332001] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   32.376501] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   32.388036] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   32.431510] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   32.443510] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   32.456084] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   32.469610] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   32.969593] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   32.995658] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   33.001780] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   33.008929] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   33.215089] hrtimer: interrupt took 18203 ns
[   33.272475] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   33.285517] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   33.293746] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   33.300433] PGD 1d6ed0067 [   33.303078] PUD 1d6e7f067 
PMD 0 [   33.306553] 
[   33.308179] Oops: 0002 [#1] PREEMPT SMP KASAN
[   33.312647] Dumping ftrace buffer:
[   33.316166]    (ftrace buffer empty)
[   33.319852] Modules linked in:
[   33.323137] CPU: 1 PID: 4221 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #79
[   33.330742] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   33.340075] task: ffff8801d7341800 task.stack: ffff8801d6968000
[   33.346102] RIP: 0010:[<ffffffff836c8e30>]  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   33.355241] RSP: 0018:ffff8801d696fac0  EFLAGS: 00010246
[   33.360736] RAX: 0000000000000000 RBX: ffff8801d6e03b80 RCX: 1ffff1003ae6841d
[   33.367986] RDX: 1ffff1003adbdcd0 RSI: ffff8801d73420c8 RDI: ffff8801d6dee680
[   33.375231] RBP: ffff8801d696fb60 R08: ffff8801d73420e8 R09: 0000000000000000
[   33.382477] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d6dee558
[   33.389739] R13: 0000000000000000 R14: ffff8801d6dee500 R15: ffff8801d696fc78
[   33.397052] FS:  00007f4d48f3f700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
[   33.405265] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   33.411132] CR2: 0000000000000080 CR3: 00000001d6e0b000 CR4: 00000000001606f0
[   33.418382] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   33.425627] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   33.433016] Stack:
[   33.435151]  0000000000000000 0000000000000004 ffff8801d60d0000 ffff8801d696fd20
[   33.443158]  ffff8801d6dee500 ffff8801d6e03cd8 ffff8801d6dee558 ffff8801d6e03cd0
[   33.451207]  ffff8801d6e03c30 ffff8801d6dee520 1ffff1003ae6841d 0000000000000000
[   33.459219] Call Trace:
[   33.461790]  [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0
[   33.467927]  [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30
[   33.474157]  [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0
[   33.480718]  [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300
[   33.486324]  [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280
[   33.491838]  [<ffffffff83a02629>] ? retint_kernel+0x2d/0x2d
[   33.497528]  [<ffffffff81237cfb>] ? trace_hardirqs_on_caller+0x38b/0x590
[   33.504359]  [<ffffffff81f2110b>] ? check_preemption_disabled+0x3b/0x170
[   33.511287]  [<ffffffff83a02629>] ? retint_kernel+0x2d/0x2d
[   33.517022]  [<ffffffff83021224>] SyS_connect+0x24/0x30
[   33.522371]  [<ffffffff83021200>] ? SyS_accept+0x30/0x30
[   33.527939]  [<ffffffff81006316>] do_syscall_64+0x1a6/0x490
[   33.533631]  [<ffffffff83a01c93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
[   33.540527] Code: 00 00 49 8d be 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 7b 09 00 00 49 8b 86 80 01 00 00 <f0> ff 80 80 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 55 d0 
[   33.567909] RIP  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   33.574699]  RSP <ffff8801d696fac0>
[   33.578311] CR2: 0000000000000080
[   33.583991] ---[ end trace 8f0f7880fe3b3d10 ]---
[   33.588733] Kernel panic - not syncing: Fatal exception
[   33.594444] Dumping ftrace buffer:
[   33.597965]    (ftrace buffer empty)
[   33.601793] Kernel Offset: disabled
[   33.605467] Rebooting in 86400 seconds..