[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   12.602088] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   19.421811] random: sshd: uninitialized urandom read (32 bytes read)
[   19.834648] random: sshd: uninitialized urandom read (32 bytes read)
[   20.308432] random: sshd: uninitialized urandom read (32 bytes read)
[   20.436175] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.22' (ECDSA) to the list of known hosts.
[   26.133745] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/23 03:26:35 parsed 1 programs
[   27.534853] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/23 03:26:38 executed programs: 0
[   28.828593] IPVS: Creating netns size=2536 id=1
[   28.944573] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   28.956610] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   28.997761] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   29.008924] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   29.050576] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   29.061912] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   29.073721] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   29.095321] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   29.139815] ip (3804) used greatest stack depth: 24264 bytes left
[   29.564628] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   29.588109] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   29.594587] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   29.602207] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   29.794655] hrtimer: interrupt took 24566 ns
[   29.814725] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   29.822960] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   29.829647] PGD 1c81d2067 [   29.832298] PUD 1c88cf067 
PMD 0 [   29.835777] 
[   29.837404] Oops: 0002 [#1] PREEMPT SMP KASAN
[   29.841875] Dumping ftrace buffer:
[   29.845401]    (ftrace buffer empty)
[   29.849100] Modules linked in:
[   29.852401] CPU: 0 PID: 4080 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #31
[   29.860000] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   29.869340] task: ffff8801d7f88000 task.stack: ffff8801d75e0000
[   29.875383] RIP: 0010:[<ffffffff836c8e30>]  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   29.884502] RSP: 0018:ffff8801d75e7ab0  EFLAGS: 00010246
[   29.889924] RAX: 0000000000000000 RBX: ffff8801d8728000 RCX: 1ffff1003aff111d
[   29.897168] RDX: 1ffff1003b0e50d0 RSI: ffff8801d7f888c8 RDI: ffff8801d8728680
[   29.904481] RBP: ffff8801d75e7b50 R08: ffff8801d7f888e8 R09: 0000000000000000
[   29.911746] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d8728558
[   29.919001] R13: 0000000000000000 R14: ffff8801d8728500 R15: ffff8801d75e7c68
[   29.926257] FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7795b40
[   29.934465] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   29.940324] CR2: 0000000000000080 CR3: 00000001c8a2c000 CR4: 00000000001606f0
[   29.947748] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   29.955003] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   29.962254] Stack:
[   29.964391]  0000000000000201 ffffffff836ca141 ffff8801d75e7ad0 ffffffff81237f0d
[   29.972408]  ffff8801d8728500 ffff8801d8728158 ffff8801d8728558 ffff8801d8728150
[   29.980409]  ffff8801d87280b0 ffff8801d8728520 0000000000000000 0000000000000000
[   29.988414] Call Trace:
[   29.990984]  [<ffffffff836ca141>] ? l2tp_session_get+0x1d1/0x790
[   29.997122]  [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10
[   30.003087]  [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0
[   30.009224]  [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30
[   30.015446]  [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0
[   30.022013]  [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300
[   30.027619]  [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280
[   30.033140]  [<ffffffff812dc050>] ? compat_SyS_get_robust_list+0x310/0x310
[   30.040134]  [<ffffffff83020830>] ? move_addr_to_kernel+0x50/0x50
[   30.046347]  [<ffffffff83021224>] SyS_connect+0x24/0x30
[   30.051695]  [<ffffffff83021200>] ? SyS_accept+0x30/0x30
[   30.057133]  [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870
[   30.063263]  [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c
[   30.069908]  [<ffffffff83a03390>] entry_SYSENTER_compat+0x90/0xa2
[   30.076117] 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 
[   30.103433] RIP  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   30.110208]  RSP <ffff8801d75e7ab0>
[   30.113809] CR2: 0000000000000080
[   30.118123] ---[ end trace aa3a992906c3d69e ]---
[   30.122904] Kernel panic - not syncing: Fatal exception
[   30.128792] Dumping ftrace buffer:
[   30.132311]    (ftrace buffer empty)
[   30.136052] Kernel Offset: disabled
[   30.139664] Rebooting in 86400 seconds..