[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   15.478036] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   19.314528] random: sshd: uninitialized urandom read (32 bytes read)
[   19.680507] random: sshd: uninitialized urandom read (32 bytes read)
[   20.119747] random: sshd: uninitialized urandom read (32 bytes read)
[   27.501912] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.54' (ECDSA) to the list of known hosts.
[   33.048088] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/23 04:31:40 parsed 1 programs
[   34.086593] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/23 04:31:42 executed programs: 0
[   35.566750] IPVS: Creating netns size=2536 id=1
[   35.701239] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   35.712561] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   35.755688] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   35.767277] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   35.811101] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   35.822242] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   35.833925] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   35.855044] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   35.900844] ip (3936) used greatest stack depth: 23976 bytes left
[   36.343158] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   36.367846] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   36.373953] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   36.381504] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   36.588126] hrtimer: interrupt took 10663 ns
[   36.657371] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   36.673958] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   36.721125] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   36.729345] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   36.736036] PGD 1d928a067 [   36.738683] PUD 1d77e2067 
PMD 0 [   36.742162] 
[   36.743784] Oops: 0002 [#1] PREEMPT SMP KASAN
[   36.748365] Dumping ftrace buffer:
[   36.751883]    (ftrace buffer empty)
[   36.755571] Modules linked in:
[   36.758862] CPU: 1 PID: 4267 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #27
[   36.766454] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   36.775785] task: ffff8801d5cf3000 task.stack: ffff8801d5258000
[   36.781814] RIP: 0010:[<ffffffff836c8e30>]  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   36.790930] RSP: 0018:ffff8801d525fac0  EFLAGS: 00010246
[   36.796351] RAX: 0000000000000000 RBX: ffff8801d90d2a00 RCX: 1ffff1003ab9e71d
[   36.803594] RDX: 1ffff1003b2b9520 RSI: ffff8801d5cf38c8 RDI: ffff8801d95ca900
[   36.810838] RBP: ffff8801d525fb60 R08: ffff8801d5cf38e8 R09: 0000000000000000
[   36.818132] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d95ca7d8
[   36.825431] R13: 0000000000000000 R14: ffff8801d95ca780 R15: ffff8801d525fc78
[   36.832688] FS:  00007f792a074700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
[   36.840891] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   36.847447] CR2: 0000000000000080 CR3: 00000001d8745000 CR4: 00000000001606f0
[   36.854703] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   36.861950] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   36.869195] Stack:
[   36.871320]  0000000000000201 ffffffff836ca141 ffff8801d525fae0 ffffffff81237f0d
[   36.879318]  ffff8801d95ca780 ffff8801d90d2b58 ffff8801d95ca7d8 ffff8801d90d2b50
[   36.887305]  ffff8801d90d2ab0 ffff8801d95ca7a0 0000000000000000 0000000000000000
[   36.895314] Call Trace:
[   36.897889]  [<ffffffff836ca141>] ? l2tp_session_get+0x1d1/0x790
[   36.904024]  [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10
[   36.909973]  [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0
[   36.916101]  [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30
[   36.922308]  [<ffffffff83a02629>] ? retint_kernel+0x2d/0x2d
[   36.927994]  [<ffffffff810eb489>] ? __virt_addr_valid+0xa9/0x1a0
[   36.934111]  [<ffffffff810eb4aa>] ? __virt_addr_valid+0xca/0x1a0
[   36.940231]  [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0
[   36.946786]  [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300
[   36.952382]  [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280
[   36.957892]  [<ffffffff812db710>] ? do_futex+0x17c0/0x17c0
[   36.963488]  [<ffffffff83021224>] SyS_connect+0x24/0x30
[   36.968824]  [<ffffffff83021200>] ? SyS_accept+0x30/0x30
[   36.974249]  [<ffffffff81006316>] do_syscall_64+0x1a6/0x490
[   36.979934]  [<ffffffff83a01c93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
[   36.986837] 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 
[   37.013722] RIP  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   37.020486]  RSP <ffff8801d525fac0>
[   37.024084] CR2: 0000000000000080
[   37.028039] ---[ end trace c3b84dbeb1c7390b ]---
[   37.032780] Kernel panic - not syncing: Fatal exception
[   37.038439] Dumping ftrace buffer:
[   37.041951]    (ftrace buffer empty)
[   37.045640] Kernel Offset: disabled
[   37.049250] Rebooting in 86400 seconds..