[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   13.634307] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   25.465133] random: sshd: uninitialized urandom read (32 bytes read)
[   26.017750] random: sshd: uninitialized urandom read (32 bytes read)
[   26.543789] random: sshd: uninitialized urandom read (32 bytes read)
[   35.857855] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.9' (ECDSA) to the list of known hosts.
[   41.479315] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/22 16:58:36 parsed 1 programs
[   42.848664] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/22 16:58:38 executed programs: 0
[   44.174731] IPVS: Creating netns size=2536 id=1
[   44.298992] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   44.311078] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   44.353787] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   44.365330] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   44.408974] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   44.420786] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   44.432556] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   44.453386] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   44.957810] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   44.983083] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   44.989264] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   44.996078] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   45.200402] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   45.208624] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   45.215302] PGD 1d98a6067 [   45.217942] PUD 1d8739067 
PMD 0 [   45.221423] 
[   45.223056] Oops: 0002 [#1] PREEMPT SMP KASAN
[   45.227523] Dumping ftrace buffer:
[   45.231032]    (ftrace buffer empty)
[   45.234713] Modules linked in:
[   45.237999] CPU: 0 PID: 4209 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #31
[   45.245590] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   45.255021] task: ffff8801d718b000 task.stack: ffff8801d5708000
[   45.261145] RIP: 0010:[<ffffffff836c8e30>]  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   45.270383] RSP: 0018:ffff8801d570fab0  EFLAGS: 00010246
[   45.275804] RAX: 0000000000000000 RBX: ffff8801da26f900 RCX: 1ffff1003ae3171d
[   45.283046] RDX: 1ffff1003b44bc30 RSI: ffff8801d718b8c8 RDI: ffff8801da25e180
[   45.290292] RBP: ffff8801d570fb50 R08: ffff8801d718b8e8 R09: 0000000000000000
[   45.297624] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801da25e058
[   45.304866] R13: 0000000000000000 R14: ffff8801da25e000 R15: ffff8801d570fc68
[   45.312119] FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f773cb40
[   45.320320] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   45.326174] CR2: 0000000000000080 CR3: 00000001d980b000 CR4: 00000000001606f0
[   45.333422] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   45.340664] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   45.347906] Stack:
[   45.350029]  0000000000000201 ffffffff836ca141 ffff8801d570fad0 ffffffff81237f0d
[   45.358118]  ffff8801da25e000 ffff8801da26fa58 ffff8801da25e058 ffff8801da26fa50
[   45.366115]  ffff8801da26f9b0 ffff8801da25e020 0000000000000000 0000000000000000
[   45.374217] Call Trace:
[   45.376782]  [<ffffffff836ca141>] ? l2tp_session_get+0x1d1/0x790
[   45.382906]  [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10
[   45.388855]  [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0
[   45.394976]  [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30
[   45.401240]  [<ffffffff8100301a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
[   45.407808]  [<ffffffff81f2110b>] ? check_preemption_disabled+0x3b/0x170
[   45.414676]  [<ffffffff83a02629>] ? retint_kernel+0x2d/0x2d
[   45.420372]  [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0
[   45.426933]  [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300
[   45.432542]  [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280
[   45.438064]  [<ffffffff812dc050>] ? compat_SyS_get_robust_list+0x310/0x310
[   45.445161]  [<ffffffff83020830>] ? move_addr_to_kernel+0x50/0x50
[   45.451431]  [<ffffffff83021224>] SyS_connect+0x24/0x30
[   45.456779]  [<ffffffff83021200>] ? SyS_accept+0x30/0x30
[   45.462205]  [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870
[   45.468327]  [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c
[   45.474968]  [<ffffffff83a03390>] entry_SYSENTER_compat+0x90/0xa2
[   45.481170] 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 
[   45.508161] RIP  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   45.514927]  RSP <ffff8801d570fab0>
[   45.518527] CR2: 0000000000000080
[   45.522800] ---[ end trace b41ffbcc0cb1e86f ]---
[   45.527608] Kernel panic - not syncing: Fatal exception
[   45.533307] Dumping ftrace buffer:
[   45.536821]    (ftrace buffer empty)
[   45.540509] Kernel Offset: disabled
[   45.544118] Rebooting in 86400 seconds..