[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   12.913837] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   22.648847] random: sshd: uninitialized urandom read (32 bytes read)
[   23.046654] random: sshd: uninitialized urandom read (32 bytes read)
[   23.555784] random: sshd: uninitialized urandom read (32 bytes read)
[   23.689840] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.32' (ECDSA) to the list of known hosts.
[   29.320168] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/23 03:28:48 parsed 1 programs
[   30.957858] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/23 03:28:51 executed programs: 0
[   32.605599] IPVS: Creating netns size=2536 id=1
[   32.728807] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   32.740681] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   32.784621] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   32.796544] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   32.840431] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   32.852016] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   32.864092] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   32.876754] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   33.395442] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   33.420880] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   33.426965] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   33.434309] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   33.623012] hrtimer: interrupt took 11335 ns
[   33.690367] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   33.822387] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   33.830864] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   33.837552] PGD 1d5cca067 [   33.840199] PUD 1d45a6067 
PMD 0 [   33.843675] 
[   33.845299] Oops: 0002 [#1] PREEMPT SMP KASAN
[   33.849765] Dumping ftrace buffer:
[   33.853280]    (ftrace buffer empty)
[   33.856979] Modules linked in:
[   33.860271] CPU: 0 PID: 4292 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #27
[   33.867864] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   33.877196] task: ffff8801d44f0000 task.stack: ffff8801d45e8000
[   33.883331] RIP: 0010:[<ffffffff836c8e30>]  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   33.892477] RSP: 0018:ffff8801d45efac0  EFLAGS: 00010246
[   33.897899] RAX: 0000000000000000 RBX: ffff8801d49dca00 RCX: 1ffff1003a89e11d
[   33.905141] RDX: 1ffff1003a93ba60 RSI: ffff8801d44f08c8 RDI: ffff8801d49dd300
[   33.912386] RBP: ffff8801d45efb60 R08: ffff8801d44f08e8 R09: 0000000000000000
[   33.919627] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d49dd1d8
[   33.926983] R13: 0000000000000000 R14: ffff8801d49dd180 R15: ffff8801d45efc78
[   33.934230] FS:  00007f3258454700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   33.942488] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   33.948389] CR2: 0000000000000080 CR3: 00000001d47c0000 CR4: 00000000001606f0
[   33.955640] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   33.962886] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   33.970134] Stack:
[   33.972260]  0000000000000201 ffffffff836ca141 ffff8801d45efae0 ffffffff81237f0d
[   33.980252]  ffff8801d49dd180 ffff8801d49dcb58 ffff8801d49dd1d8 ffff8801d49dcb50
[   33.988254]  ffff8801d49dcab0 ffff8801d49dd1a0 0000000000000000 0000000000000000
[   33.996247] Call Trace:
[   33.998814]  [<ffffffff836ca141>] ? l2tp_session_get+0x1d1/0x790
[   34.004937]  [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10
[   34.010882]  [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0
[   34.017001]  [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30
[   34.023210]  [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0
[   34.029814]  [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300
[   34.035418]  [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280
[   34.040933]  [<ffffffff812db710>] ? do_futex+0x17c0/0x17c0
[   34.046535]  [<ffffffff83a02629>] ? retint_kernel+0x2d/0x2d
[   34.052226]  [<ffffffff83021224>] SyS_connect+0x24/0x30
[   34.057563]  [<ffffffff83021200>] ? SyS_accept+0x30/0x30
[   34.062988]  [<ffffffff81006316>] do_syscall_64+0x1a6/0x490
[   34.068672]  [<ffffffff83a01c93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
[   34.075569] 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 
[   34.102563] RIP  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   34.109331]  RSP <ffff8801d45efac0>
[   34.112927] CR2: 0000000000000080
[   34.118264] ---[ end trace 3f089d80b2597b3b ]---
[   34.123096] Kernel panic - not syncing: Fatal exception
[   34.128761] Dumping ftrace buffer:
[   34.132274]    (ftrace buffer empty)
[   34.135958] Kernel Offset: disabled
[   34.139560] Rebooting in 86400 seconds..