[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   15.656131] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   20.444284] random: sshd: uninitialized urandom read (32 bytes read)
[   20.885032] random: sshd: uninitialized urandom read (32 bytes read)
[   21.393820] random: sshd: uninitialized urandom read (32 bytes read)
[   27.280425] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.12' (ECDSA) to the list of known hosts.
[   32.806352] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/23 03:17:01 parsed 1 programs
[   34.391769] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/23 03:17:04 executed programs: 0
[   36.085271] IPVS: Creating netns size=2536 id=1
[   36.208362] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   36.220199] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   36.262344] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   36.273451] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   36.316856] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   36.327971] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   36.339719] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   36.352696] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   36.852875] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   36.877072] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   36.883158] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   36.891224] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   37.105880] hrtimer: interrupt took 19600 ns
[   37.522422] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   37.530690] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   37.537416] PGD 1d384a067 [   37.540064] PUD 1d366a067 
PMD 0 [   37.543551] 
[   37.545179] Oops: 0002 [#1] PREEMPT SMP KASAN
[   37.549654] Dumping ftrace buffer:
[   37.553177]    (ftrace buffer empty)
[   37.556867] Modules linked in:
[   37.560170] CPU: 0 PID: 4409 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #27
[   37.567850] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   37.577191] task: ffff8801d3eb8000 task.stack: ffff8801d05a0000
[   37.583235] RIP: 0010:[<ffffffff836c8e30>]  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   37.592357] RSP: 0018:ffff8801d05a7ac0  EFLAGS: 00010246
[   37.597795] RAX: 0000000000000000 RBX: ffff8801d3b1ec80 RCX: 1ffff1003a7d711d
[   37.605046] RDX: 1ffff1003a763cd0 RSI: ffff8801d3eb88c8 RDI: ffff8801d3b1e680
[   37.612296] RBP: ffff8801d05a7b60 R08: ffff8801d3eb88e8 R09: 0000000000000000
[   37.619549] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d3b1e558
[   37.626799] R13: 0000000000000000 R14: ffff8801d3b1e500 R15: ffff8801d05a7c78
[   37.634052] FS:  00007f2c9a2f4700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   37.642258] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   37.648119] CR2: 0000000000000080 CR3: 00000001d32e5000 CR4: 00000000001606f0
[   37.655373] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   37.662644] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   37.669894] Stack:
[   37.672025]  0000000000000201 ffffffff836ca141 ffff8801d05a7ae0 ffffffff81237f0d
[   37.680050]  ffff8801d3b1e500 ffff8801d3b1edd8 ffff8801d3b1e558 ffff8801d3b1edd0
[   37.688241]  ffff8801d3b1ed30 ffff8801d3b1e520 0000000000000000 0000000000000000
[   37.696274] Call Trace:
[   37.698845]  [<ffffffff836ca141>] ? l2tp_session_get+0x1d1/0x790
[   37.704972]  [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10
[   37.710929]  [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0
[   37.717054]  [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30
[   37.723279]  [<ffffffff8100301a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
[   37.729845]  [<ffffffff81f2110b>] ? check_preemption_disabled+0x3b/0x170
[   37.736677]  [<ffffffff83a02629>] ? retint_kernel+0x2d/0x2d
[   37.742369]  [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0
[   37.748933]  [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300
[   37.754539]  [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280
[   37.760058]  [<ffffffff812db710>] ? do_futex+0x17c0/0x17c0
[   37.765864]  [<ffffffff83020830>] ? move_addr_to_kernel+0x50/0x50
[   37.772081]  [<ffffffff83021224>] SyS_connect+0x24/0x30
[   37.777435]  [<ffffffff83021200>] ? SyS_accept+0x30/0x30
[   37.782867]  [<ffffffff81006316>] do_syscall_64+0x1a6/0x490
[   37.788562]  [<ffffffff83a01c93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
[   37.795469] 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 
[   37.823040] RIP  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   37.829816]  RSP <ffff8801d05a7ac0>
[   37.833434] CR2: 0000000000000080
[   37.837513] ---[ end trace 38f790687d51db3a ]---
[   37.842278] Kernel panic - not syncing: Fatal exception
[   37.847971] Dumping ftrace buffer:
[   37.851505]    (ftrace buffer empty)
[   37.855196] Kernel Offset: disabled
[   37.858803] Rebooting in 86400 seconds..