[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   12.271404] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   18.082586] random: sshd: uninitialized urandom read (32 bytes read)
[   18.389797] random: sshd: uninitialized urandom read (32 bytes read)
[   18.833721] random: sshd: uninitialized urandom read (32 bytes read)
[   28.380770] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.32' (ECDSA) to the list of known hosts.
[   33.831989] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/20 11:58:29 parsed 1 programs
[   34.948680] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/20 11:58:31 executed programs: 0
[   36.061813] IPVS: Creating netns size=2536 id=1
[   36.184082] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   36.196427] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   36.239060] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   36.250193] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   36.294040] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   36.305441] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   36.317369] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   36.338106] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   36.831146] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   36.856343] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   36.862561] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   36.869292] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   37.211482] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   37.219699] IP: [<ffffffff836c7e40>] l2tp_session_create+0xc60/0x16f0
[   37.226386] PGD 1ba34b067 [   37.229024] PUD 1bbf13067 
PMD 0 [   37.232496] 
[   37.234184] Oops: 0002 [#1] PREEMPT SMP KASAN
[   37.238658] Dumping ftrace buffer:
[   37.242171]    (ftrace buffer empty)
[   37.245858] Modules linked in:
[   37.249190] CPU: 0 PID: 4184 Comm: syz-executor0 Not tainted 4.9.122-g54068d6 #26
[   37.256782] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   37.266108] task: ffff8801d6c03000 task.stack: ffff8801d5020000
[   37.272237] RIP: 0010:[<ffffffff836c7e40>]  [<ffffffff836c7e40>] l2tp_session_create+0xc60/0x16f0
[   37.281348] RSP: 0018:ffff8801d5027ac0  EFLAGS: 00010246
[   37.286768] RAX: 0000000000000000 RBX: ffff8801da29f180 RCX: 1ffff1003ad8071d
[   37.294013] RDX: 1ffff1003b453f00 RSI: ffff8801d6c038c8 RDI: ffff8801da29f800
[   37.301263] RBP: ffff8801d5027b60 R08: ffff8801d6c038e8 R09: 0000000000000000
[   37.308614] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801da29f6d8
[   37.315863] R13: 0000000000000000 R14: ffff8801da29f680 R15: 0000000000000000
[   37.323113] FS:  00007f7f1b45c700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   37.331313] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   37.337170] CR2: 0000000000000080 CR3: 00000001d7ef8000 CR4: 00000000001606f0
[   37.344416] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   37.351660] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   37.358905] Stack:
[   37.361082]  ffffffff836c80b7 ffffffff836c9151 ffff8801d424cc48 0000000000000000
[   37.369067]  ffff8801da29f680 ffff8801da29f2d8 ffff8801da29f6d8 ffff8801da29f2d0
[   37.377041]  ffff8801da29f230 ffff8801da29f6a0 ffff8801d424c400 0000000000000000
[   37.385021] Call Trace:
[   37.387586]  [<ffffffff836c80b7>] ? l2tp_session_create+0xed7/0x16f0
[   37.394058]  [<ffffffff836c9151>] ? l2tp_session_get+0x1d1/0x790
[   37.400180]  [<ffffffff836ccff7>] pppol2tp_connect+0x10d7/0x18f0
[   37.406304]  [<ffffffff836cbf20>] ? pppol2tp_seq_show+0xc30/0xc30
[   37.412515]  [<ffffffff81cf826f>] ? security_socket_connect+0x8f/0xc0
[   37.419078]  [<ffffffff8301d958>] SYSC_connect+0x1b8/0x300
[   37.424683]  [<ffffffff8301d7a0>] ? SYSC_bind+0x280/0x280
[   37.430198]  [<ffffffff815daf70>] ? get_unused_fd_flags+0xd0/0xd0
[   37.436483]  [<ffffffff812db6d0>] ? do_futex+0x17c0/0x17c0
[   37.442095]  [<ffffffff8301f951>] ? SyS_socket+0x121/0x1b0
[   37.447695]  [<ffffffff8301f830>] ? move_addr_to_kernel+0x50/0x50
[   37.453909]  [<ffffffff815b77d0>] ? do_vfs_ioctl+0x11a0/0x11a0
[   37.459864]  [<ffffffff83020224>] SyS_connect+0x24/0x30
[   37.465303]  [<ffffffff83020200>] ? SyS_accept+0x30/0x30
[   37.470812]  [<ffffffff81006316>] do_syscall_64+0x1a6/0x490
[   37.476509]  [<ffffffff83a00cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
[   37.483408] 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 
[   37.510284] RIP  [<ffffffff836c7e40>] l2tp_session_create+0xc60/0x16f0
[   37.517091]  RSP <ffff8801d5027ac0>
[   37.520699] CR2: 0000000000000080
[   37.524756] ---[ end trace 1f81e6f3faeff8c8 ]---
[   37.529562] Kernel panic - not syncing: Fatal exception
[   37.535222] Dumping ftrace buffer:
[   37.538737]    (ftrace buffer empty)
[   37.542420] Kernel Offset: disabled
[   37.546022] Rebooting in 86400 seconds..