[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   21.919610] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   26.669758] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available)
[   27.212713] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available)
[   27.966216] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available)
[   28.134196] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available)
Warning: Permanently added '10.128.10.29' (ECDSA) to the list of known hosts.
[   33.750130] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available)
2018/08/22 11:39:05 parsed 1 programs
[   35.275529] random: cc1: uninitialized urandom read (8 bytes read, 83 bits of entropy available)
2018/08/22 11:39:08 executed programs: 0
[   36.571155] IPVS: Creating netns size=2552 id=1
[   36.817612] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   36.833419] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   36.914379] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   36.930104] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   37.012855] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   37.030191] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   37.045790] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   37.062756] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   37.809587] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   37.848847] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
2018/08/22 11:39:13 executed programs: 204
2018/08/22 11:39:18 executed programs: 503
[   50.074852] l2tp_core: tunl 4: sockfd_lookup(fd=5) returned -9
2018/08/22 11:39:23 executed programs: 803
2018/08/22 11:39:28 executed programs: 1096
[   57.149904] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   57.158171] IP: [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030
[   57.164877] PGD 1d2164067 PUD 1d64bb067 PMD 0 
[   57.169823] Oops: 0002 [#1] PREEMPT SMP KASAN
[   57.174792] Dumping ftrace buffer:
[   57.178370]    (ftrace buffer empty)
[   57.182066] Modules linked in:
[   57.185369] CPU: 0 PID: 8580 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #20
[   57.192972] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   57.202359] task: ffff8801c7fee000 task.stack: ffff8801c7870000
[   57.208409] RIP: 0010:[<ffffffff835aa438>]  [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030
[   57.217540] RSP: 0018:ffff8801c7877ad0  EFLAGS: 00010246
[   57.223017] RAX: 0000000000000000 RBX: ffff8800b3a31680 RCX: 0000000000000006
[   57.230283] RDX: 1ffff10016746300 RSI: ffffffff835a4543 RDI: ffff8800b3a31800
[   57.237566] RBP: ffff8801c7877b40 R08: ffff8801c7fee900 R09: 0000000000000000
[   57.244822] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8800b3a30828
[   57.252078] R13: ffff8801c7877c58 R14: ffff8800b3a30780 R15: ffffffff835a3170
[   57.259330] FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f77a9b40
[   57.267544] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   57.273409] CR2: 0000000000000080 CR3: 00000001d40be000 CR4: 00000000001606f0
[   57.280667] Stack:
[   57.282814]  ffffffff81140a6a ffff8800b3a316a0 ffff8800b3a308d8 ffff8800b3a30790
[   57.290880]  ffffffff838cba90 ffff8800b3a30830 ffff8800b3a308d0 ffff8800b3a31760
[   57.298893]  ffffffff00000000 ffff8801c96fb300 0000000000000000 ffff8801c96fb330
[   57.306895] Call Trace:
[   57.309464]  [<ffffffff81140a6a>] ? __local_bh_enable_ip+0x6a/0xd0
[   57.315775]  [<ffffffff838cba90>] ? _raw_read_unlock_bh+0x30/0x40
[   57.321992]  [<ffffffff835ae830>] pppol2tp_connect+0x10f0/0x1910
[   57.328117]  [<ffffffff835ad740>] ? pppol2tp_recv+0x320/0x320
[   57.333982]  [<ffffffff81c5700f>] ? security_socket_connect+0x8f/0xc0
[   57.340542]  [<ffffffff82f27758>] SYSC_connect+0x1b8/0x300
[   57.346179]  [<ffffffff82f275a0>] ? SYSC_bind+0x280/0x280
[   57.351716]  [<ffffffff8157fdd0>] ? get_unused_fd_flags+0xd0/0xd0
[   57.357929]  [<ffffffff812d59b0>] ? compat_SyS_get_robust_list+0x310/0x310
[   57.364920]  [<ffffffff82f297c1>] ? SyS_socket+0x121/0x1b0
[   57.370528]  [<ffffffff82f296a0>] ? move_addr_to_kernel+0x50/0x50
[   57.376746]  [<ffffffff82f2a094>] SyS_connect+0x24/0x30
[   57.382109]  [<ffffffff82f2a070>] ? SyS_accept+0x30/0x30
[   57.387541]  [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0
[   57.393668]  [<ffffffff838cda83>] sysenter_flags_fixed+0xd/0x1a
[   57.399704] 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 
[   57.426904] RIP  [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030
[   57.433688]  RSP <ffff8801c7877ad0>
[   57.437297] CR2: 0000000000000080
[   57.441124] ---[ end trace 2384117e180e1154 ]---
[   57.445880] Kernel panic - not syncing: Fatal exception
[   57.451530] Dumping ftrace buffer:
[   57.455053]    (ftrace buffer empty)
[   57.458745] Kernel Offset: disabled
[   57.462351] Rebooting in 86400 seconds..