[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   16.548336] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   20.512283] random: sshd: uninitialized urandom read (32 bytes read)
[   20.778352] random: sshd: uninitialized urandom read (32 bytes read)
[   21.260747] random: sshd: uninitialized urandom read (32 bytes read)
[   38.347456] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.55' (ECDSA) to the list of known hosts.
[   44.016316] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/23 20:34:42 parsed 1 programs
[   45.644527] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/23 20:34:44 executed programs: 0
[   46.832069] IPVS: Creating netns size=2536 id=1
[   46.955530] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   46.966847] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   47.009996] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   47.021658] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   47.063987] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   47.075301] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   47.087153] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   47.101203] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   47.615293] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   47.639974] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   47.646078] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   47.653285] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   47.860541] hrtimer: interrupt took 10703 ns
[   47.938428] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   48.044202] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   48.056721] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   48.079795] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   48.140069] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   48.148285] IP: [<ffffffff836c8f30>] l2tp_session_create+0xc60/0x16f0
[   48.154972] PGD 1d4846067 [   48.157613] PUD 1d6e15067 
PMD 0 [   48.161093] 
[   48.162724] Oops: 0002 [#1] PREEMPT SMP KASAN
[   48.167192] Dumping ftrace buffer:
[   48.170707]    (ftrace buffer empty)
[   48.174395] Modules linked in:
[   48.177768] CPU: 0 PID: 4333 Comm: syz-executor0 Not tainted 4.9.123-g7fa8c15 #32
[   48.185362] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   48.194699] task: ffff8801d4de8000 task.stack: ffff8801d4440000
[   48.200738] RIP: 0010:[<ffffffff836c8f30>]  [<ffffffff836c8f30>] l2tp_session_create+0xc60/0x16f0
[   48.209866] RSP: 0018:ffff8801d4447ab0  EFLAGS: 00010246
[   48.215294] RAX: 0000000000000000 RBX: ffff8801d486d680 RCX: 1ffff1003a9bd11d
[   48.222539] RDX: 1ffff1003a90da10 RSI: ffff8801d4de88c8 RDI: ffff8801d486d080
[   48.229784] RBP: ffff8801d4447b50 R08: ffff8801d4de88e8 R09: 0000000000000000
[   48.237035] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d486cf58
[   48.244279] R13: 0000000000000000 R14: ffff8801d486cf00 R15: ffff8801d4447c68
[   48.251529] FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7701b40
[   48.259731] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   48.265588] CR2: 0000000000000080 CR3: 00000001d6d85000 CR4: 00000000001606f0
[   48.272837] Stack:
[   48.274961]  0000000000000201 ffffffff836ca241 ffff8801d4447ad0 ffffffff81237f0d
[   48.283002]  ffff8801d486cf00 ffff8801d486d7d8 ffff8801d486cf58 ffff8801d486d7d0
[   48.290993]  ffff8801d486d730 ffff8801d486cf20 0000000000000000 0000000000000000
[   48.299026] Call Trace:
[   48.301603]  [<ffffffff836ca241>] ? l2tp_session_get+0x1d1/0x790
[   48.307790]  [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10
[   48.313798]  [<ffffffff836ce0e7>] pppol2tp_connect+0x10d7/0x18f0
[   48.319929]  [<ffffffff836cd010>] ? pppol2tp_seq_show+0xc30/0xc30
[   48.326142]  [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0
[   48.332701]  [<ffffffff8301ea38>] SYSC_connect+0x1b8/0x300
[   48.338305]  [<ffffffff8301e880>] ? SYSC_bind+0x280/0x280
[   48.343820]  [<ffffffff812dc050>] ? compat_SyS_get_robust_list+0x310/0x310
[   48.350813]  [<ffffffff83a02729>] ? retint_kernel+0x2d/0x2d
[   48.356502]  [<ffffffff83021314>] SyS_connect+0x24/0x30
[   48.361840]  [<ffffffff830212f0>] ? SyS_accept+0x30/0x30
[   48.367265]  [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870
[   48.373436]  [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c
[   48.380089]  [<ffffffff83a03490>] entry_SYSENTER_compat+0x90/0xa2
[   48.386296] 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 
[   48.413350] RIP  [<ffffffff836c8f30>] l2tp_session_create+0xc60/0x16f0
[   48.420122]  RSP <ffff8801d4447ab0>
[   48.423721] CR2: 0000000000000080
[   48.428274] ---[ end trace a161eb6a8fa2e98d ]---
[   48.433018] Kernel panic - not syncing: Fatal exception
[   48.438660] Dumping ftrace buffer:
[   48.442181]    (ftrace buffer empty)
[   48.445866] Kernel Offset: disabled
[   48.449467] Rebooting in 86400 seconds..