[....] 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[   15.398297] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   34.877752] random: sshd: uninitialized urandom read (32 bytes read)
[   35.142365] random: sshd: uninitialized urandom read (32 bytes read)
[   35.519653] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.8' (ECDSA) to the list of known hosts.
[   41.278502] urandom_read: 1 callbacks suppressed
[   41.278506] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/28 23:37:24 parsed 1 programs
[   42.462234] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/28 23:37:25 executed programs: 0
[   43.484571] IPVS: Creating netns size=2536 id=1
[   43.608301] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   43.620566] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   43.665217] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   43.676423] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   43.721329] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   43.732584] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   43.744187] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   43.764559] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   44.267214] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   44.292733] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   44.298837] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   44.306010] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   44.518333] hrtimer: interrupt took 11376 ns
[   44.547513] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   44.555746] IP: [<ffffffff836c8bb0>] l2tp_session_create+0xc60/0x16f0
[   44.562446] PGD 1d7447067 [   44.565149] PUD 1d6ea3067 
PMD 0 [   44.568634] 
[   44.570255] Oops: 0002 [#1] PREEMPT SMP KASAN
[   44.574726] Dumping ftrace buffer:
[   44.578346]    (ftrace buffer empty)
[   44.582038] Modules linked in:
[   44.585336] CPU: 1 PID: 4216 Comm: syz-executor0 Not tainted 4.9.124-g09eb2ba #31
[   44.592928] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   44.602257] task: ffff8801d69ab000 task.stack: ffff8801d5080000
[   44.608402] RIP: 0010:[<ffffffff836c8bb0>]  [<ffffffff836c8bb0>] l2tp_session_create+0xc60/0x16f0
[   44.617516] RSP: 0018:ffff8801d5087ac0  EFLAGS: 00010246
[   44.622943] RAX: 0000000000000000 RBX: ffff8801d8423b80 RCX: 1ffff1003ad3571d
[   44.630191] RDX: 1ffff1003b1d7d70 RSI: ffff8801d69ab8c8 RDI: ffff8801d8ebeb80
[   44.637541] RBP: ffff8801d5087b60 R08: ffff8801d69ab8e8 R09: 0000000000000000
[   44.644788] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d8ebea58
[   44.652054] R13: 0000000000000000 R14: ffff8801d8ebea00 R15: ffff8801d5087c78
[   44.659313] FS:  00007fa02cc5d700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
[   44.667517] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   44.673375] CR2: 0000000000000080 CR3: 00000001d8796000 CR4: 00000000001606f0
[   44.680625] Stack:
[   44.682757]  0000000000000201 ffffffff836c9ec1 ffff8801d5087ae0 ffffffff812383ad
[   44.690768]  ffff8801d8ebea00 ffff8801d8423cd8 ffff8801d8ebea58 ffff8801d8423cd0
[   44.698796]  ffff8801d8423c30 ffff8801d8ebea20 0000000000000000 0000000000000000
[   44.706824] Call Trace:
[   44.709388]  [<ffffffff836c9ec1>] ? l2tp_session_get+0x1d1/0x790
[   44.715547]  [<ffffffff812383ad>] ? trace_hardirqs_on+0xd/0x10
[   44.721511]  [<ffffffff836cdd67>] pppol2tp_connect+0x10d7/0x18f0
[   44.727655]  [<ffffffff836ccc90>] ? pppol2tp_seq_show+0xc30/0xc30
[   44.733866]  [<ffffffff81cf902f>] ? security_socket_connect+0x8f/0xc0
[   44.740426]  [<ffffffff8301ea38>] SYSC_connect+0x1b8/0x300
[   44.746031]  [<ffffffff8301e880>] ? SYSC_bind+0x280/0x280
[   44.751546]  [<ffffffff815dbc10>] ? get_unused_fd_flags+0xd0/0xd0
[   44.757755]  [<ffffffff812db650>] ? do_futex+0x17c0/0x17c0
[   44.763355]  [<ffffffff83020a31>] ? SyS_socket+0x121/0x1b0
[   44.768953]  [<ffffffff83020910>] ? move_addr_to_kernel+0x50/0x50
[   44.775160]  [<ffffffff8123819b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   44.781979]  [<ffffffff83021314>] SyS_connect+0x24/0x30
[   44.787320]  [<ffffffff830212f0>] ? SyS_accept+0x30/0x30
[   44.792750]  [<ffffffff81006316>] do_syscall_64+0x1a6/0x490
[   44.798436]  [<ffffffff83a019d3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
[   44.805330] 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 
[   44.832259] RIP  [<ffffffff836c8bb0>] l2tp_session_create+0xc60/0x16f0
[   44.839030]  RSP <ffff8801d5087ac0>
[   44.842633] CR2: 0000000000000080
[   44.846498] ---[ end trace 38c4f751728c8470 ]---
[   44.851441] Kernel panic - not syncing: Fatal exception
[   44.857045] Dumping ftrace buffer:
[   44.860562]    (ftrace buffer empty)
[   44.864267] Kernel Offset: disabled
[   44.867866] Rebooting in 86400 seconds..