[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   21.204591] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.
[   21.738177] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available)
[   22.067139] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available)

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   22.838658] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available)
[   24.702378] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available)
Warning: Permanently added '10.128.10.63' (ECDSA) to the list of known hosts.
[   30.303494] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available)
2018/08/22 15:23:16 parsed 1 programs
[   31.704845] random: cc1: uninitialized urandom read (8 bytes read, 78 bits of entropy available)
2018/08/22 15:23:18 executed programs: 0
[   33.613713] IPVS: Creating netns size=2552 id=1
[   33.854398] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   33.869483] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   33.950361] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   33.965253] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   34.043952] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   34.059163] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   34.076560] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   34.093157] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   34.134341] ip (3950) used greatest stack depth: 23584 bytes left
[   34.823822] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   34.867523] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   35.153348] hrtimer: interrupt took 25072 ns
[   35.901210] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   36.327391] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   36.567152] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   36.575405] IP: [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030
[   36.582101] PGD b6809067 PUD b683d067 PMD 0 
[   36.586901] Oops: 0002 [#1] PREEMPT SMP KASAN
[   36.591856] Dumping ftrace buffer:
[   36.595417]    (ftrace buffer empty)
[   36.599140] Modules linked in:
[   36.602430] CPU: 0 PID: 4588 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #84
[   36.610027] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   36.619358] task: ffff8801d34e1800 task.stack: ffff8800baca0000
[   36.625391] RIP: 0010:[<ffffffff835aa438>]  [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030
[   36.634504] RSP: 0018:ffff8800baca7b48  EFLAGS: 00010246
[   36.639927] RAX: 0000000000000000 RBX: ffff8800b76aac80 RCX: 0000000000000006
[   36.647170] RDX: 1ffff10016ed55c0 RSI: ffffffff835a4543 RDI: ffff8800b76aae00
[   36.654454] RBP: ffff8800baca7bb8 R08: ffff8801d34e2100 R09: 0000000000000000
[   36.661701] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801d34154a8
[   36.668946] R13: ffff8800baca7cd0 R14: ffff8801d3415400 R15: ffffffff835a3170
[   36.676193] FS:  00007f85ea709700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   36.684401] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   36.690280] CR2: 0000000000000080 CR3: 00000000b6faa000 CR4: 00000000001606f0
[   36.697535] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   36.704785] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   36.712034] Stack:
[   36.714164]  ffffffff81140a6a ffff8800b76aaca0 ffff8801d3415558 ffff8801d3415410
[   36.722181]  ffffffff838cba90 ffff8801d34154b0 ffff8801d3415550 ffff8800b76aad60
[   36.730203]  ffffffff00000000 ffff8800b76d1980 0000000000000000 ffff8800b76d19b0
[   36.738181] Call Trace:
[   36.740746]  [<ffffffff81140a6a>] ? __local_bh_enable_ip+0x6a/0xd0
[   36.747045]  [<ffffffff838cba90>] ? _raw_read_unlock_bh+0x30/0x40
[   36.753256]  [<ffffffff835ae830>] pppol2tp_connect+0x10f0/0x1910
[   36.759381]  [<ffffffff835ad740>] ? pppol2tp_recv+0x320/0x320
[   36.765268]  [<ffffffff81c5700f>] ? security_socket_connect+0x8f/0xc0
[   36.771832]  [<ffffffff82f27758>] SYSC_connect+0x1b8/0x300
[   36.777450]  [<ffffffff813fcff1>] ? SYSC_perf_event_open+0x211/0x2470
[   36.784025]  [<ffffffff82f275a0>] ? SYSC_bind+0x280/0x280
[   36.789547]  [<ffffffff8157fdd0>] ? get_unused_fd_flags+0xd0/0xd0
[   36.795762]  [<ffffffff812d5080>] ? do_futex+0x17f0/0x17f0
[   36.801730]  [<ffffffff82f296a0>] ? move_addr_to_kernel+0x50/0x50
[   36.807942]  [<ffffffff82f2a094>] SyS_connect+0x24/0x30
[   36.813288]  [<ffffffff838cc125>] entry_SYSCALL_64_fastpath+0x22/0x9e
[   36.819847] Code: 00 00 48 8d bb 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 36 06 00 00 48 8b 83 80 01 00 00 <f0> ff 80 80 00 00 00 48 8d 43 20 48 89 c7 48 89 45 b0 e8 f1 13 
[   36.846806] RIP  [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030
[   36.853573]  RSP <ffff8800baca7b48>
[   36.857171] CR2: 0000000000000080
[   36.862992] ---[ end trace ca2e0ff97ca97171 ]---
[   36.868460] Kernel panic - not syncing: Fatal exception
[   36.874151] Dumping ftrace buffer:
[   36.877670]    (ftrace buffer empty)
[   36.881358] Kernel Offset: disabled
[   36.884965] Rebooting in 86400 seconds..