[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   14.314601] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.
[   14.730842] random: sshd: uninitialized urandom read (32 bytes read)
[   14.902422] random: sshd: uninitialized urandom read (32 bytes read)
[   15.406757] random: sshd: uninitialized urandom read (32 bytes read)

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   15.543409] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.11' (ECDSA) to the list of known hosts.
[   21.308934] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/29 10:25:05 parsed 1 programs
[   22.388615] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/29 10:25:07 executed programs: 0
[   23.426454] IPVS: Creating netns size=2536 id=1
[   23.551663] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   23.563620] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   23.606883] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   23.618337] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   23.663094] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   23.674435] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   23.686382] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   23.699656] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   24.217853] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   24.243512] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   24.249785] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   24.257342] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   24.456065] hrtimer: interrupt took 15562 ns
[   24.528301] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   24.611171] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   24.619748] IP: [<ffffffff836c8bb0>] l2tp_session_create+0xc60/0x16f0
[   24.626782] PGD 1d6d38067 [   24.629438] PUD 1bfa0b067 
PMD 0 [   24.633045] 
[   24.634679] Oops: 0002 [#1] PREEMPT SMP KASAN
[   24.639163] Dumping ftrace buffer:
[   24.642811]    (ftrace buffer empty)
[   24.646670] Modules linked in:
[   24.649988] CPU: 1 PID: 4159 Comm: syz-executor0 Not tainted 4.9.124-g09eb2ba #83
[   24.657751] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   24.667220] task: ffff8801d74c0000 task.stack: ffff8801d6ec8000
[   24.673422] RIP: 0010:[<ffffffff836c8bb0>]  [<ffffffff836c8bb0>] l2tp_session_create+0xc60/0x16f0
[   24.682687] RSP: 0018:ffff8801d6ecfac0  EFLAGS: 00010246
[   24.688252] RAX: 0000000000000000 RBX: ffff8801d6edb900 RCX: 1ffff1003ae9811d
[   24.695514] RDX: 1ffff1003b4397a0 RSI: ffff8801d74c08c8 RDI: ffff8801da1cbd00
[   24.702777] RBP: ffff8801d6ecfb60 R08: ffff8801d74c08e8 R09: 0000000000000000
[   24.711250] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801da1cbbd8
[   24.718833] R13: 0000000000000000 R14: ffff8801da1cbb80 R15: ffff8801d6ecfc78
[   24.726241] FS:  00007f046126d700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
[   24.734591] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   24.740562] CR2: 0000000000000080 CR3: 00000001d7245000 CR4: 00000000001606f0
[   24.747982] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   24.755512] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   24.762774] Stack:
[   24.765012]  0000000000000000 0000000000000004 ffff8801d76e3300 ffff8801d6ecfd20
[   24.773437]  ffff8801da1cbb80 ffff8801d6edba58 ffff8801da1cbbd8 ffff8801d6edba50
[   24.781620]  ffff8801d6edb9b0 ffff8801da1cbba0 0000000000000000 0000000000000000
[   24.789801] Call Trace:
[   24.792386]  [<ffffffff836cdd67>] pppol2tp_connect+0x10d7/0x18f0
[   24.798517]  [<ffffffff836ccc90>] ? pppol2tp_seq_show+0xc30/0xc30
[   24.804763]  [<ffffffff81f2106b>] ? check_preemption_disabled+0x3b/0x170
[   24.811695]  [<ffffffff83a02369>] ? retint_kernel+0x2d/0x2d
[   24.817556]  [<ffffffff8301e525>] ? move_addr_to_kernel.part.13+0x35/0x110
[   24.824563]  [<ffffffff81cf902f>] ? security_socket_connect+0x8f/0xc0
[   24.831335]  [<ffffffff8301ea38>] SYSC_connect+0x1b8/0x300
[   24.836954]  [<ffffffff8301e880>] ? SYSC_bind+0x280/0x280
[   24.842484]  [<ffffffff812db650>] ? do_futex+0x17c0/0x17c0
[   24.848222]  [<ffffffff83020910>] ? move_addr_to_kernel+0x50/0x50
[   24.854444]  [<ffffffff83021314>] SyS_connect+0x24/0x30
[   24.859797]  [<ffffffff830212f0>] ? SyS_accept+0x30/0x30
[   24.865240]  [<ffffffff81006316>] do_syscall_64+0x1a6/0x490
[   24.870945]  [<ffffffff83a019d3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
[   24.877855] 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 
[   24.906085] RIP  [<ffffffff836c8bb0>] l2tp_session_create+0xc60/0x16f0
[   24.913022]  RSP <ffff8801d6ecfac0>
[   24.916776] CR2: 0000000000000080
[   24.922230] ---[ end trace d51af209a60b3c60 ]---
[   24.927355] Kernel panic - not syncing: Fatal exception
[   24.933372] Dumping ftrace buffer:
[   24.936906]    (ftrace buffer empty)
[   24.940697] Kernel Offset: disabled
[   24.944344] Rebooting in 86400 seconds..