[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   17.945086] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   22.216396] random: sshd: uninitialized urandom read (32 bytes read)
[   22.803023] random: sshd: uninitialized urandom read (32 bytes read)
[   23.334097] random: sshd: uninitialized urandom read (32 bytes read)
[   45.939212] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.23' (ECDSA) to the list of known hosts.
[   51.582679] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/23 13:04:07 parsed 1 programs
[   53.101102] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/23 13:04:09 executed programs: 0
[   54.353439] IPVS: Creating netns size=2536 id=1
[   54.475999] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   54.488023] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   54.529750] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   54.540675] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   54.582368] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   54.593384] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   54.605036] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   54.618905] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   55.112879] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   55.138044] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   55.144153] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   55.151491] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   55.376431] hrtimer: interrupt took 26267 ns
[   55.413305] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   55.487865] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   55.517589] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   55.534711] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   55.653489] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   55.661735] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   55.668435] PGD 1d46cc067 [   55.671083] PUD 1d49bb067 
PMD 0 [   55.674576] 
[   55.676213] Oops: 0002 [#1] PREEMPT SMP KASAN
[   55.680687] Dumping ftrace buffer:
[   55.684206]    (ftrace buffer empty)
[   55.687894] Modules linked in:
[   55.691201] CPU: 0 PID: 4329 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #31
[   55.698800] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   55.708139] task: ffff8801d4b9c800 task.stack: ffff8801d4140000
[   55.714178] RIP: 0010:[<ffffffff836c8e30>]  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   55.723309] RSP: 0018:ffff8801d4147ab0  EFLAGS: 00010246
[   55.728739] RAX: 0000000000000000 RBX: ffff8801d4805180 RCX: 1ffff1003a973a1d
[   55.735994] RDX: 1ffff1003a9009c0 RSI: ffff8801d4b9d0c8 RDI: ffff8801d4804e00
[   55.743245] RBP: ffff8801d4147b50 R08: ffff8801d4b9d0e8 R09: 0000000000000000
[   55.750509] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d4804cd8
[   55.757763] R13: 0000000000000000 R14: ffff8801d4804c80 R15: ffff8801d4147c68
[   55.765017] FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7741b40
[   55.773224] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   55.779086] CR2: 0000000000000080 CR3: 00000001d6f71000 CR4: 00000000001606f0
[   55.786341] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   55.793590] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   55.800841] Stack:
[   55.802976]  0000000000000201 ffffffff836ca141 ffff8801d4147ad0 ffffffff81237f0d
[   55.810998]  ffff8801d4804c80 ffff8801d48052d8 ffff8801d4804cd8 ffff8801d48052d0
[   55.819020]  ffff8801d4805230 ffff8801d4804ca0 0000000000000000 0000000000000000
[   55.827041] Call Trace:
[   55.829621]  [<ffffffff836ca141>] ? l2tp_session_get+0x1d1/0x790
[   55.835751]  [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10
[   55.841711]  [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0
[   55.847842]  [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30
[   55.854058]  [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0
[   55.860622]  [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300
[   55.866229]  [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280
[   55.871752]  [<ffffffff812dc050>] ? compat_SyS_get_robust_list+0x310/0x310
[   55.878749]  [<ffffffff83020830>] ? move_addr_to_kernel+0x50/0x50
[   55.884965]  [<ffffffff83021224>] SyS_connect+0x24/0x30
[   55.890315]  [<ffffffff83021200>] ? SyS_accept+0x30/0x30
[   55.895752]  [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870
[   55.901880]  [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c
[   55.908535]  [<ffffffff83a03390>] entry_SYSENTER_compat+0x90/0xa2
[   55.914746] 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 
[   55.941971] RIP  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   55.948752]  RSP <ffff8801d4147ab0>
[   55.952359] CR2: 0000000000000080
[   55.959106] ---[ end trace 07b88812e1e344eb ]---
[   55.964019] Kernel panic - not syncing: Fatal exception
[   55.969833] Dumping ftrace buffer:
[   55.973353]    (ftrace buffer empty)
[   55.977038] Kernel Offset: disabled
[   55.980637] Rebooting in 86400 seconds..