[....] 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[   15.888525] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   19.979598] random: sshd: uninitialized urandom read (32 bytes read)
[   20.317773] random: sshd: uninitialized urandom read (32 bytes read)
[   20.781838] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.14' (ECDSA) to the list of known hosts.
[   26.413098] urandom_read: 1 callbacks suppressed
[   26.413101] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/23 05:20:05 parsed 1 programs
[   27.469382] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/23 05:20:06 executed programs: 0
[   28.452099] IPVS: Creating netns size=2536 id=1
[   28.573977] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   28.586176] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   28.628666] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   28.639921] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   28.682895] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   28.694273] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   28.706405] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   28.727040] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   28.772598] ip (3917) used greatest stack depth: 23528 bytes left
[   29.213137] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   29.237433] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   29.243666] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   29.251114] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   29.437907] hrtimer: interrupt took 12537 ns
[   29.496670] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   29.504901] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   29.511582] PGD 1bb12d067 [   29.514222] PUD 1d7256067 
PMD 0 [   29.517701] 
[   29.519323] Oops: 0002 [#1] PREEMPT SMP KASAN
[   29.523842] Dumping ftrace buffer:
[   29.527435]    (ftrace buffer empty)
[   29.531126] Modules linked in:
[   29.534413] CPU: 1 PID: 4209 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #27
[   29.542043] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   29.551377] task: ffff8801d60e4800 task.stack: ffff8801d5180000
[   29.557508] RIP: 0010:[<ffffffff836c8e30>]  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   29.566725] RSP: 0018:ffff8801d5187ac0  EFLAGS: 00010246
[   29.572147] RAX: 0000000000000000 RBX: ffff8801d8721180 RCX: 1ffff1003ac1ca1d
[   29.579433] RDX: 1ffff1003b068350 RSI: ffff8801d60e50c8 RDI: ffff8801d8341a80
[   29.586684] RBP: ffff8801d5187b60 R08: ffff8801d60e50e8 R09: 0000000000000000
[   29.593930] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d8341958
[   29.601178] R13: 0000000000000000 R14: ffff8801d8341900 R15: ffff8801d5187c78
[   29.608427] FS:  00007fbec1821700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
[   29.616627] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   29.622480] CR2: 0000000000000080 CR3: 00000001d9616000 CR4: 00000000001606f0
[   29.629732] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   29.636980] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   29.644224] Stack:
[   29.646346]  0000000000000201 ffffffff836ca141 ffff8801d5187ae0 ffffffff81237f0d
[   29.654436]  ffff8801d8341900 ffff8801d87212d8 ffff8801d8341958 ffff8801d87212d0
[   29.662498]  ffff8801d8721230 ffff8801d8341920 0000000000000000 0000000000000000
[   29.670509] Call Trace:
[   29.673119]  [<ffffffff836ca141>] ? l2tp_session_get+0x1d1/0x790
[   29.679251]  [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10
[   29.685260]  [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0
[   29.691385]  [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30
[   29.697641]  [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0
[   29.704204]  [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300
[   29.709805]  [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280
[   29.715322]  [<ffffffff812db710>] ? do_futex+0x17c0/0x17c0
[   29.720926]  [<ffffffff83a02629>] ? retint_kernel+0x2d/0x2d
[   29.726616]  [<ffffffff8141ac00>] ? perf_bp_event+0x180/0x180
[   29.732474]  [<ffffffff83021224>] SyS_connect+0x24/0x30
[   29.737815]  [<ffffffff83021200>] ? SyS_accept+0x30/0x30
[   29.743297]  [<ffffffff81006316>] do_syscall_64+0x1a6/0x490
[   29.748994]  [<ffffffff83a01c93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
[   29.755891] 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 
[   29.782895] RIP  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   29.789658]  RSP <ffff8801d5187ac0>
[   29.793258] CR2: 0000000000000080
[   29.797512] ---[ end trace daf6bb614cd7c5ce ]---
[   29.802291] Kernel panic - not syncing: Fatal exception
[   29.808020] Dumping ftrace buffer:
[   29.811539]    (ftrace buffer empty)
[   29.815224] Kernel Offset: disabled
[   29.818823] Rebooting in 86400 seconds..