[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   13.574808] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   21.558146] random: sshd: uninitialized urandom read (32 bytes read)
[   22.034900] random: sshd: uninitialized urandom read (32 bytes read)
[   22.542155] random: sshd: uninitialized urandom read (32 bytes read)
[   22.671990] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.24' (ECDSA) to the list of known hosts.
[   28.273015] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/22 19:08:58 parsed 1 programs
[   29.450776] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/22 19:09:00 executed programs: 0
[   30.573126] IPVS: Creating netns size=2536 id=1
[   30.701971] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   30.714056] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   30.758454] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   30.770330] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   30.814950] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   30.826508] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   30.838969] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   30.859763] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   31.364219] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   31.389343] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   31.395454] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   31.402563] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   31.609786] hrtimer: interrupt took 10604 ns
[   31.663917] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   31.672163] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   31.678874] PGD 1b8c54067 [   31.681650] PUD 1d6f4c067 
PMD 0 [   31.685209] 
[   31.686828] Oops: 0002 [#1] PREEMPT SMP KASAN
[   31.691295] Dumping ftrace buffer:
[   31.694804]    (ftrace buffer empty)
[   31.698484] Modules linked in:
[   31.701765] CPU: 0 PID: 4210 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #27
[   31.709357] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   31.718704] task: ffff8801d6869800 task.stack: ffff8801d51b8000
[   31.724828] RIP: 0010:[<ffffffff836c8e30>]  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   31.733990] RSP: 0018:ffff8801d51bfac0  EFLAGS: 00010246
[   31.739410] RAX: 0000000000000000 RBX: ffff8801da1d4a00 RCX: 1ffff1003ad0d41d
[   31.746665] RDX: 1ffff1003b1bd610 RSI: ffff8801d686a0c8 RDI: ffff8801d8deb080
[   31.753929] RBP: ffff8801d51bfb60 R08: ffff8801d686a0e8 R09: 0000000000000000
[   31.761174] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d8deaf58
[   31.768415] R13: 0000000000000000 R14: ffff8801d8deaf00 R15: ffff8801d51bfc78
[   31.775660] FS:  00007f3999407700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   31.783884] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   31.789839] CR2: 0000000000000080 CR3: 00000001d6f3f000 CR4: 00000000001606f0
[   31.797086] Stack:
[   31.799208]  0000000000000201 ffffffff836ca141 ffff8801d51bfae0 ffffffff81237f0d
[   31.807230]  ffff8801d8deaf00 ffff8801da1d4b58 ffff8801d8deaf58 ffff8801da1d4b50
[   31.815219]  ffff8801da1d4ab0 ffff8801d8deaf20 0000000000000000 0000000000000000
[   31.823199] Call Trace:
[   31.825764]  [<ffffffff836ca141>] ? l2tp_session_get+0x1d1/0x790
[   31.831907]  [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10
[   31.837848]  [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0
[   31.843963]  [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30
[   31.850227]  [<ffffffff81566823>] ? check_stack_object+0xe3/0x150
[   31.856442]  [<ffffffff81360db1>] ? __sanitizer_cov_trace_pc+0x1/0x50
[   31.862997]  [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0
[   31.869684]  [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300
[   31.875279]  [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280
[   31.880880]  [<ffffffff812db710>] ? do_futex+0x17c0/0x17c0
[   31.886485]  [<ffffffff83020830>] ? move_addr_to_kernel+0x50/0x50
[   31.892694]  [<ffffffff83021224>] SyS_connect+0x24/0x30
[   31.898043]  [<ffffffff83021200>] ? SyS_accept+0x30/0x30
[   31.903470]  [<ffffffff81006316>] do_syscall_64+0x1a6/0x490
[   31.909202]  [<ffffffff83a01c93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
[   31.916193] 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 
[   31.943537] RIP  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   31.950320]  RSP <ffff8801d51bfac0>
[   31.953930] CR2: 0000000000000080
[   31.957951] ---[ end trace c5f09b6b98f0d4fe ]---
[   31.962697] Kernel panic - not syncing: Fatal exception
[   31.968321] Dumping ftrace buffer:
[   31.971840]    (ftrace buffer empty)
[   31.975525] Kernel Offset: disabled
[   31.979125] Rebooting in 86400 seconds..