[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   20.566889] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   26.421533] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available)
[   26.866937] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available)
[   27.618265] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available)
[   27.790018] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available)
Warning: Permanently added '10.128.10.6' (ECDSA) to the list of known hosts.
[   33.375899] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available)
2018/08/22 18:30:14 parsed 1 programs
[   34.899643] random: cc1: uninitialized urandom read (8 bytes read, 75 bits of entropy available)
2018/08/22 18:30:16 executed programs: 0
[   35.881438] IPVS: Creating netns size=2552 id=1
[   36.128115] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   36.142522] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   36.226800] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   36.243026] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   36.324881] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   36.340456] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   36.357539] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   36.375533] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   37.103420] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   37.142673] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   37.432357] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   37.476951] hrtimer: interrupt took 26226 ns
[   37.949039] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   37.957274] IP: [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030
[   37.963954] PGD ba4c1067 PUD b990f067 PMD 0 
[   37.968710] Oops: 0002 [#1] PREEMPT SMP KASAN
[   37.973659] Dumping ftrace buffer:
[   37.977170]    (ftrace buffer empty)
[   37.980859] Modules linked in:
[   37.984143] CPU: 0 PID: 4246 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #20
[   37.991770] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   38.001101] task: ffff8801d70ab000 task.stack: ffff8800b98e8000
[   38.007128] RIP: 0010:[<ffffffff835aa438>]  [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030
[   38.016239] RSP: 0018:ffff8800b98efad0  EFLAGS: 00010246
[   38.021658] RAX: 0000000000000000 RBX: ffff8801da393400 RCX: 0000000000000006
[   38.028914] RDX: 1ffff1003b4726b0 RSI: ffffffff835a4543 RDI: ffff8801da393580
[   38.036155] RBP: ffff8800b98efb40 R08: ffff8801d70ab900 R09: 0000000000000000
[   38.043412] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801da392fa8
[   38.050658] R13: ffff8800b98efc58 R14: ffff8801da392f00 R15: ffffffff835a3170
[   38.057902] FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7784b40
[   38.066098] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   38.071953] CR2: 0000000000000080 CR3: 00000000ba1b0000 CR4: 00000000001606f0
[   38.079197] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   38.086441] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   38.093680] Stack:
[   38.095808]  ffffffff81140a6a ffff8801da393420 ffff8801da393058 ffff8801da392f10
[   38.103800]  ffffffff838cba90 ffff8801da392fb0 ffff8801da393050 ffff8801da3934e0
[   38.111804]  ffffffff00000000 ffff8801d875b300 0000000000000000 ffff8801d875b330
[   38.119781] Call Trace:
[   38.122345]  [<ffffffff81140a6a>] ? __local_bh_enable_ip+0x6a/0xd0
[   38.128639]  [<ffffffff838cba90>] ? _raw_read_unlock_bh+0x30/0x40
[   38.134846]  [<ffffffff835ae830>] pppol2tp_connect+0x10f0/0x1910
[   38.140962]  [<ffffffff835ad740>] ? pppol2tp_recv+0x320/0x320
[   38.146823]  [<ffffffff81c5700f>] ? security_socket_connect+0x8f/0xc0
[   38.153377]  [<ffffffff82f27758>] SYSC_connect+0x1b8/0x300
[   38.158975]  [<ffffffff813fcff1>] ? SYSC_perf_event_open+0x211/0x2470
[   38.165527]  [<ffffffff82f275a0>] ? SYSC_bind+0x280/0x280
[   38.171038]  [<ffffffff8157fdd0>] ? get_unused_fd_flags+0xd0/0xd0
[   38.177244]  [<ffffffff812d59b0>] ? compat_SyS_get_robust_list+0x310/0x310
[   38.184231]  [<ffffffff82f296a0>] ? move_addr_to_kernel+0x50/0x50
[   38.190452]  [<ffffffff82f2a094>] SyS_connect+0x24/0x30
[   38.195791]  [<ffffffff82f2a070>] ? SyS_accept+0x30/0x30
[   38.201215]  [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0
[   38.207333]  [<ffffffff838cda83>] sysenter_flags_fixed+0xd/0x1a
[   38.213358] Code: 00 00 48 8d bb 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 36 06 00 00 48 8b 83 80 01 00 00 <f0> ff 80 80 00 00 00 48 8d 43 20 48 89 c7 48 89 45 b0 e8 f1 13 
[   38.240163] RIP  [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030
[   38.246942]  RSP <ffff8800b98efad0>
[   38.250537] CR2: 0000000000000080
[   38.257173] ---[ end trace a7a6476e5a5f532d ]---
[   38.261927] Kernel panic - not syncing: Fatal exception
[   38.267664] Dumping ftrace buffer:
[   38.271182]    (ftrace buffer empty)
[   38.274866] Kernel Offset: disabled
[   38.278461] Rebooting in 86400 seconds..