[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   14.313613] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   17.229466] random: sshd: uninitialized urandom read (32 bytes read)
[   17.567386] random: sshd: uninitialized urandom read (32 bytes read)
[   18.080474] random: sshd: uninitialized urandom read (32 bytes read)
[   78.094463] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.15.199' (ECDSA) to the list of known hosts.
[   83.654709] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/23 04:20:03 parsed 1 programs
[   84.689565] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/23 04:20:04 executed programs: 0
[   85.689114] IPVS: Creating netns size=2536 id=1
[   85.814420] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   85.826438] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   85.870553] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   85.882207] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   85.924996] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   85.936897] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   85.948932] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   85.969602] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   86.466865] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   86.491747] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   86.498287] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   86.505606] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   86.694081] hrtimer: interrupt took 11696 ns
[   86.800536] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   86.808785] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   86.815466] PGD 1d56aa067 [   86.818107] PUD 1d4b6c067 
PMD 0 [   86.821585] 
[   86.823206] Oops: 0002 [#1] PREEMPT SMP KASAN
[   86.827777] Dumping ftrace buffer:
[   86.831291]    (ftrace buffer empty)
[   86.834975] Modules linked in:
[   86.838344] CPU: 0 PID: 4278 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #79
[   86.845936] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   86.855379] task: ffff8801d62b9800 task.stack: ffff8801d4620000
[   86.861409] RIP: 0010:[<ffffffff836c8e30>]  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   86.870629] RSP: 0018:ffff8801d4627ac0  EFLAGS: 00010246
[   86.876152] RAX: 0000000000000000 RBX: ffff8801d8e07680 RCX: 1ffff1003ac5741d
[   86.883397] RDX: 1ffff1003b083660 RSI: ffff8801d62ba0c8 RDI: ffff8801d841b300
[   86.890681] RBP: ffff8801d4627b60 R08: ffff8801d62ba0e8 R09: 0000000000000000
[   86.897932] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d841b1d8
[   86.905174] R13: 0000000000000000 R14: ffff8801d841b180 R15: ffff8801d4627c78
[   86.912419] FS:  00007f25012d1700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   86.920622] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   86.926486] CR2: 0000000000000080 CR3: 00000001d52e4000 CR4: 00000000001606f0
[   86.933733] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   86.940976] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   86.948223] Stack:
[   86.950352]  0000000000000201 ffffffff836ca141 ffff8801d4627ae0 ffffffff81237f0d
[   86.958388]  ffff8801d841b180 ffff8801d8e077d8 ffff8801d841b1d8 ffff8801d8e077d0
[   86.966379]  ffff8801d8e07730 ffff8801d841b1a0 0000000000000000 0000000000000000
[   86.974439] Call Trace:
[   86.977011]  [<ffffffff836ca141>] ? l2tp_session_get+0x1d1/0x790
[   86.983133]  [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10
[   86.989164]  [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0
[   86.995330]  [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30
[   87.001545]  [<ffffffff8100301a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
[   87.008100]  [<ffffffff81f2110b>] ? check_preemption_disabled+0x3b/0x170
[   87.014915]  [<ffffffff83a02629>] ? retint_kernel+0x2d/0x2d
[   87.020600]  [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0
[   87.027154]  [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300
[   87.032750]  [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280
[   87.038262]  [<ffffffff812db710>] ? do_futex+0x17c0/0x17c0
[   87.043860]  [<ffffffff83020830>] ? move_addr_to_kernel+0x50/0x50
[   87.050075]  [<ffffffff83021224>] SyS_connect+0x24/0x30
[   87.055415]  [<ffffffff83021200>] ? SyS_accept+0x30/0x30
[   87.060842]  [<ffffffff81006316>] do_syscall_64+0x1a6/0x490
[   87.066532]  [<ffffffff83a01c93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
[   87.073535] 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 
[   87.100382] RIP  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   87.107147]  RSP <ffff8801d4627ac0>
[   87.110743] CR2: 0000000000000080
[   87.116117] ---[ end trace cf41ed5c4352f971 ]---
[   87.120889] Kernel panic - not syncing: Fatal exception
[   87.126598] Dumping ftrace buffer:
[   87.130112]    (ftrace buffer empty)
[   87.133797] Kernel Offset: disabled
[   87.138074] Rebooting in 86400 seconds..