[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   15.996195] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   17.452862] random: sshd: uninitialized urandom read (32 bytes read)
[   17.806129] random: sshd: uninitialized urandom read (32 bytes read)
[   18.299280] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.53' (ECDSA) to the list of known hosts.
[   24.081187] urandom_read: 1 callbacks suppressed
[   24.081191] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/22 15:59:17 parsed 1 programs
[   25.138369] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/22 15:59:19 executed programs: 0
[   26.359548] IPVS: Creating netns size=2536 id=1
[   26.478857] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   26.490564] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   26.532323] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   26.544062] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   26.586360] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   26.597481] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   26.609097] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   26.629700] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   26.766624] ip (3946) used greatest stack depth: 23976 bytes left
[   27.119655] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   27.144487] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   27.150585] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   27.158097] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   27.345993] hrtimer: interrupt took 11750 ns
[   27.437606] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   27.445859] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   27.452560] PGD 1d6cb2067 [   27.455204] PUD 1da239067 
PMD 0 [   27.458680] 
[   27.460305] Oops: 0002 [#1] PREEMPT SMP KASAN
[   27.464775] Dumping ftrace buffer:
[   27.468289]    (ftrace buffer empty)
[   27.471972] Modules linked in:
[   27.475259] CPU: 1 PID: 4214 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #27
[   27.482849] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   27.492198] task: ffff8801d52c6000 task.stack: ffff8801c6468000
[   27.498228] RIP: 0010:[<ffffffff836c8e30>]  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   27.507341] RSP: 0018:ffff8801c646fac0  EFLAGS: 00010246
[   27.512863] RAX: 0000000000000000 RBX: ffff8801d871a000 RCX: 1ffff1003aa58d1d
[   27.520125] RDX: 1ffff1003b0daf50 RSI: ffff8801d52c68c8 RDI: ffff8801d86d7a80
[   27.527373] RBP: ffff8801c646fb60 R08: ffff8801d52c68e8 R09: 0000000000000000
[   27.534636] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d86d7958
[   27.541884] R13: 0000000000000000 R14: ffff8801d86d7900 R15: ffff8801c646fc78
[   27.549144] FS:  00007f167d30a700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
[   27.557345] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   27.563204] CR2: 0000000000000080 CR3: 00000001da1ce000 CR4: 00000000001606f0
[   27.570453] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   27.577697] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   27.584946] Stack:
[   27.587073]  0000000000000201 ffffffff836ca141 ffff8801c646fae0 ffffffff81237f0d
[   27.595067]  ffff8801d86d7900 ffff8801d871a158 ffff8801d86d7958 ffff8801d871a150
[   27.603107]  ffff8801d871a0b0 ffff8801d86d7920 0000000000000000 0000000000000000
[   27.611090] Call Trace:
[   27.613658]  [<ffffffff836ca141>] ? l2tp_session_get+0x1d1/0x790
[   27.619783]  [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10
[   27.625730]  [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0
[   27.631849]  [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30
[   27.638106]  [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0
[   27.644682]  [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300
[   27.650287]  [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280
[   27.655806]  [<ffffffff812db710>] ? do_futex+0x17c0/0x17c0
[   27.661421]  [<ffffffff83020830>] ? move_addr_to_kernel+0x50/0x50
[   27.667627]  [<ffffffff83021224>] SyS_connect+0x24/0x30
[   27.672980]  [<ffffffff83021200>] ? SyS_accept+0x30/0x30
[   27.678412]  [<ffffffff81006316>] do_syscall_64+0x1a6/0x490
[   27.684103]  [<ffffffff83a01c93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
[   27.691001] 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 
[   27.718065] RIP  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   27.724916]  RSP <ffff8801c646fac0>
[   27.728515] CR2: 0000000000000080
[   27.732326] ---[ end trace 8c8694fca20c1cc5 ]---
[   27.737202] Kernel panic - not syncing: Fatal exception
[   27.742891] Dumping ftrace buffer:
[   27.746431]    (ftrace buffer empty)
[   27.750130] Kernel Offset: disabled
[   27.753731] Rebooting in 86400 seconds..