[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   13.543451] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   28.769808] random: sshd: uninitialized urandom read (32 bytes read)
[   29.132649] random: sshd: uninitialized urandom read (32 bytes read)
[   29.523770] random: sshd: uninitialized urandom read (32 bytes read)
[   34.104898] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.45' (ECDSA) to the list of known hosts.
[   39.825932] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/22 20:56:43 parsed 1 programs
[   40.909290] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/22 20:56:44 executed programs: 0
[   42.123630] IPVS: Creating netns size=2536 id=1
[   42.243087] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   42.254254] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   42.298415] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   42.309521] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   42.352418] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   42.363912] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   42.375330] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   42.388346] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   42.879106] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   42.904580] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   42.910863] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   42.917881] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   43.117641] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   43.126171] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   43.132851] PGD 1d6ed1067 [   43.135616] PUD 1d7ce7067 
PMD 0 [   43.139098] 
[   43.140720] Oops: 0002 [#1] PREEMPT SMP KASAN
[   43.145188] Dumping ftrace buffer:
[   43.148705]    (ftrace buffer empty)
[   43.152388] Modules linked in:
[   43.155680] CPU: 0 PID: 4214 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #27
[   43.163281] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   43.172612] task: ffff8801d94cc800 task.stack: ffff8801d52f0000
[   43.178639] RIP: 0010:[<ffffffff836c8e30>]  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   43.187827] RSP: 0018:ffff8801d52f7ac0  EFLAGS: 00010246
[   43.193249] RAX: 0000000000000000 RBX: ffff8801da1d8c80 RCX: 1ffff1003b299a1d
[   43.200600] RDX: 1ffff1003b43b260 RSI: ffff8801d94cd0c8 RDI: ffff8801da1d9300
[   43.207908] RBP: ffff8801d52f7b60 R08: ffff8801d94cd0e8 R09: 0000000000000000
[   43.215862] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801da1d91d8
[   43.223113] R13: 0000000000000000 R14: ffff8801da1d9180 R15: ffff8801d52f7c78
[   43.230363] FS:  00007feea377d700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   43.238562] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   43.244415] CR2: 0000000000000080 CR3: 00000001d73e5000 CR4: 00000000001606f0
[   43.251662] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   43.258903] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   43.266221] Stack:
[   43.268381]  0000000000000201 ffffffff836ca141 ffff8801d52f7ae0 ffffffff81237f0d
[   43.276368]  ffff8801da1d9180 ffff8801da1d8dd8 ffff8801da1d91d8 ffff8801da1d8dd0
[   43.284619]  ffff8801da1d8d30 ffff8801da1d91a0 0000000000000000 0000000000000000
[   43.292610] Call Trace:
[   43.295176]  [<ffffffff836ca141>] ? l2tp_session_get+0x1d1/0x790
[   43.301301]  [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10
[   43.307254]  [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0
[   43.313381]  [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30
[   43.319815]  [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0
[   43.326369]  [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300
[   43.332055]  [<ffffffff81238470>] ? debug_check_no_locks_freed+0x210/0x210
[   43.339101]  [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280
[   43.344626]  [<ffffffff815dbcb0>] ? get_unused_fd_flags+0xd0/0xd0
[   43.350951]  [<ffffffff812db710>] ? do_futex+0x17c0/0x17c0
[   43.356551]  [<ffffffff815dd57f>] ? SyS_dup2+0x41f/0x5e0
[   43.361982]  [<ffffffff83021224>] SyS_connect+0x24/0x30
[   43.367510]  [<ffffffff83021200>] ? SyS_accept+0x30/0x30
[   43.373119]  [<ffffffff81006316>] do_syscall_64+0x1a6/0x490
[   43.378812]  [<ffffffff83a01c93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
[   43.385711] 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 
[   43.412738] RIP  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   43.419500]  RSP <ffff8801d52f7ac0>
[   43.423099] CR2: 0000000000000080
[   43.427487] ---[ end trace 0307ca98dbcc906a ]---
[   43.432341] Kernel panic - not syncing: Fatal exception
[   43.438003] Dumping ftrace buffer:
[   43.441524]    (ftrace buffer empty)
[   43.445216] Kernel Offset: disabled
[   43.448821] Rebooting in 86400 seconds..