[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   20.146215] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   23.537081] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available)
[   23.894229] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available)
[   24.701184] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available)
[   27.602722] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available)
Warning: Permanently added '10.128.0.59' (ECDSA) to the list of known hosts.
[   33.152277] random: sshd: uninitialized urandom read (32 bytes read, 86 bits of entropy available)
2018/08/22 23:47:49 parsed 1 programs
[   34.781920] random: cc1: uninitialized urandom read (8 bytes read, 88 bits of entropy available)
2018/08/22 23:47:52 executed programs: 0
[   35.904266] IPVS: Creating netns size=2552 id=1
[   36.155956] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   36.170471] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   36.253071] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   36.269579] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   36.355948] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   36.370690] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   36.386238] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   36.402742] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   37.130578] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   37.169456] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   37.459320] hrtimer: interrupt took 18100 ns
[   37.533874] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   37.542084] IP: [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030
[   37.548759] PGD 1d8e98067 PUD 1cd9e2067 PMD 0 
[   37.553715] Oops: 0002 [#1] PREEMPT SMP KASAN
[   37.558723] Dumping ftrace buffer:
[   37.562238]    (ftrace buffer empty)
[   37.565925] Modules linked in:
[   37.569213] CPU: 0 PID: 4084 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #20
[   37.576845] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   37.586307] task: ffff8801d94ae000 task.stack: ffff8801d8a30000
[   37.592336] RIP: 0010:[<ffffffff835aa438>]  [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030
[   37.601451] RSP: 0018:ffff8801d8a37ad0  EFLAGS: 00010246
[   37.606877] RAX: 0000000000000000 RBX: ffff8801d9589900 RCX: 0000000000000006
[   37.614117] RDX: 1ffff1003b2b1350 RSI: ffffffff835a4543 RDI: ffff8801d9589a80
[   37.621363] RBP: ffff8801d8a37b40 R08: ffff8801d94ae900 R09: 0000000000000000
[   37.628611] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8800bac674a8
[   37.635859] R13: ffff8801d8a37c58 R14: ffff8800bac67400 R15: ffffffff835a3170
[   37.643110] FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f777fb40
[   37.651310] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   37.657167] CR2: 0000000000000080 CR3: 00000001d897a000 CR4: 00000000001606f0
[   37.664412] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   37.671807] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   37.679052] Stack:
[   37.681172]  ffffffff81140a6a ffff8801d9589920 ffff8800bac67558 ffff8800bac67410
[   37.689164]  ffffffff838cba90 ffff8800bac674b0 ffff8800bac67550 ffff8801d95899e0
[   37.697139]  ffffffff00000000 ffff8800bab11100 0000000000000000 ffff8800bab11130
[   37.705114] Call Trace:
[   37.707680]  [<ffffffff81140a6a>] ? __local_bh_enable_ip+0x6a/0xd0
[   37.713974]  [<ffffffff838cba90>] ? _raw_read_unlock_bh+0x30/0x40
[   37.720179]  [<ffffffff835ae830>] pppol2tp_connect+0x10f0/0x1910
[   37.726311]  [<ffffffff835ad740>] ? pppol2tp_recv+0x320/0x320
[   37.732170]  [<ffffffff81c5700f>] ? security_socket_connect+0x8f/0xc0
[   37.738722]  [<ffffffff82f27758>] SYSC_connect+0x1b8/0x300
[   37.744330]  [<ffffffff813fcff1>] ? SYSC_perf_event_open+0x211/0x2470
[   37.750888]  [<ffffffff82f275a0>] ? SYSC_bind+0x280/0x280
[   37.756398]  [<ffffffff8157fdd0>] ? get_unused_fd_flags+0xd0/0xd0
[   37.762604]  [<ffffffff812d59b0>] ? compat_SyS_get_robust_list+0x310/0x310
[   37.769591]  [<ffffffff82f296a0>] ? move_addr_to_kernel+0x50/0x50
[   37.775793]  [<ffffffff82f2a094>] SyS_connect+0x24/0x30
[   37.781277]  [<ffffffff82f2a070>] ? SyS_accept+0x30/0x30
[   37.786724]  [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0
[   37.792848]  [<ffffffff838cda83>] sysenter_flags_fixed+0xd/0x1a
[   37.798874] 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 
[   37.825822] RIP  [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030
[   37.832581]  RSP <ffff8801d8a37ad0>
[   37.836175] CR2: 0000000000000080
[   37.840328] ---[ end trace d2af0f5e14b7dab6 ]---
[   37.845597] Kernel panic - not syncing: Fatal exception
[   37.851288] Dumping ftrace buffer:
[   37.854810]    (ftrace buffer empty)
[   37.858493] Kernel Offset: disabled
[   37.862090] Rebooting in 86400 seconds..