[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   12.831202] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   18.140239] random: sshd: uninitialized urandom read (32 bytes read)
[   18.541583] random: sshd: uninitialized urandom read (32 bytes read)
[   19.054412] random: sshd: uninitialized urandom read (32 bytes read)
[   19.182097] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.34' (ECDSA) to the list of known hosts.
[   24.705336] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/22 21:44:08 parsed 1 programs
[   26.103869] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/22 21:44:10 executed programs: 0
[   27.267058] IPVS: Creating netns size=2536 id=1
[   27.389177] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   27.400516] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   27.442503] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   27.454094] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   27.496436] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   27.507463] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   27.518994] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   27.540056] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   28.036809] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   28.062540] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   28.068619] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   28.075906] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   28.289383] hrtimer: interrupt took 12396 ns
[   28.356086] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   28.364291] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   28.370971] PGD 1d80f8067 [   28.373611] PUD 1d8712067 
PMD 0 [   28.377084] 
[   28.378700] Oops: 0002 [#1] PREEMPT SMP KASAN
[   28.383164] Dumping ftrace buffer:
[   28.386675]    (ftrace buffer empty)
[   28.390354] Modules linked in:
[   28.393631] CPU: 1 PID: 4242 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #31
[   28.401221] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   28.410546] task: ffff8801d554b000 task.stack: ffff8801b6550000
[   28.416569] RIP: 0010:[<ffffffff836c8e30>]  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   28.425682] RSP: 0018:ffff8801b6557ab0  EFLAGS: 00010246
[   28.431206] RAX: 0000000000000000 RBX: ffff8801da1e4a00 RCX: 1ffff1003aaa971d
[   28.438460] RDX: 1ffff1003b43ca10 RSI: ffff8801d554b8c8 RDI: ffff8801da1e5080
[   28.445702] RBP: ffff8801b6557b50 R08: ffff8801d554b8e8 R09: 0000000000000000
[   28.452959] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801da1e4f58
[   28.460199] R13: 0000000000000000 R14: ffff8801da1e4f00 R15: ffff8801b6557c68
[   28.467441] FS:  0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f7768b40
[   28.475634] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   28.481482] CR2: 0000000000000080 CR3: 00000001d6e33000 CR4: 00000000001606f0
[   28.488722] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   28.495965] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   28.503215] Stack:
[   28.505334]  0000000000000201 ffffffff836ca141 ffff8801b6557ad0 ffffffff81237f0d
[   28.513348]  ffff8801da1e4f00 ffff8801da1e4b58 ffff8801da1e4f58 ffff8801da1e4b50
[   28.521339]  ffff8801da1e4ab0 ffff8801da1e4f20 0000000000000000 0000000000000000
[   28.529312] Call Trace:
[   28.531871]  [<ffffffff836ca141>] ? l2tp_session_get+0x1d1/0x790
[   28.537989]  [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10
[   28.543931]  [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0
[   28.550153]  [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30
[   28.556362]  [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0
[   28.562914]  [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300
[   28.568510]  [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280
[   28.574019]  [<ffffffff812dc050>] ? compat_SyS_get_robust_list+0x310/0x310
[   28.581005]  [<ffffffff83020830>] ? move_addr_to_kernel+0x50/0x50
[   28.587206]  [<ffffffff83021224>] SyS_connect+0x24/0x30
[   28.592538]  [<ffffffff83021200>] ? SyS_accept+0x30/0x30
[   28.597959]  [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870
[   28.604183]  [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c
[   28.610834]  [<ffffffff83a03390>] entry_SYSENTER_compat+0x90/0xa2
[   28.617038] 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 
[   28.643730] RIP  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   28.650489]  RSP <ffff8801b6557ab0>
[   28.654081] CR2: 0000000000000080
[   28.658107] ---[ end trace 060b41ff16f539e2 ]---
[   28.662968] Kernel panic - not syncing: Fatal exception
[   28.668596] Dumping ftrace buffer:
[   28.672108]    (ftrace buffer empty)
[   28.675859] Kernel Offset: disabled
[   28.679468] Rebooting in 86400 seconds..