[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   21.633121] 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: [   25.769802] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available)
[   26.237145] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available)
[   26.890936] random: sshd: uninitialized urandom read (32 bytes read, 61 bits of entropy available)
[   45.885860] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available)
Warning: Permanently added '10.128.10.8' (ECDSA) to the list of known hosts.
[   51.546282] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available)
2018/08/22 05:33:29 parsed 1 programs
[   53.037120] random: cc1: uninitialized urandom read (8 bytes read, 77 bits of entropy available)
2018/08/22 05:33:31 executed programs: 0
[   54.047518] IPVS: Creating netns size=2552 id=1
[   54.297436] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   54.312721] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   54.394929] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   54.410166] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   54.494118] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   54.508534] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   54.525759] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   54.543489] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   55.288341] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   55.327960] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   55.682042] hrtimer: interrupt took 54063 ns
[   55.860380] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   56.460711] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
2018/08/22 05:33:36 executed programs: 184
[   61.343467] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   61.351702] IP: [<ffffffff835a93b8>] l2tp_session_create+0x948/0x1030
[   61.358410] PGD b2566067 PUD b3dab067 PMD 0 
[   61.363152] Oops: 0002 [#1] PREEMPT SMP KASAN
[   61.368158] Dumping ftrace buffer:
[   61.371669]    (ftrace buffer empty)
[   61.375358] Modules linked in:
[   61.378643] CPU: 1 PID: 5365 Comm: syz-executor0 Not tainted 4.4.150-g5541782 #19
[   61.386233] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   61.395561] task: ffff8800af6e8000 task.stack: ffff8800af040000
[   61.401590] RIP: 0010:[<ffffffff835a93b8>]  [<ffffffff835a93b8>] l2tp_session_create+0x948/0x1030
[   61.410719] RSP: 0018:ffff8800af047ad0  EFLAGS: 00010246
[   61.416149] RAX: 0000000000000000 RBX: ffff8801d027a780 RCX: 0000000000000006
[   61.423400] RDX: 1ffff1003a04f520 RSI: ffffffff835a3493 RDI: ffff8801d027a900
[   61.430647] RBP: ffff8800af047b40 R08: ffff8800af6e8900 R09: 0000000000000000
[   61.437899] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8800b26ab9a8
[   61.445149] R13: ffff8800af047c58 R14: ffff8800b26ab900 R15: ffffffff835a20c0
[   61.452402] FS:  0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f7769b40
[   61.460608] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   61.466467] CR2: 0000000000000080 CR3: 00000000ba553000 CR4: 00000000001606f0
[   61.473712] Stack:
[   61.475834]  ffffffff8114094a ffff8801d027a7a0 ffff8800b26aba58 ffff8800b26ab910
[   61.483874]  ffffffff838caa10 ffff8800b26ab9b0 ffff8800b26aba50 ffff8801d027a860
[   61.491858]  ffffffff00000000 ffff8801d94b6e80 0000000000000000 ffff8801d94b6eb0
[   61.499876] Call Trace:
[   61.502443]  [<ffffffff8114094a>] ? __local_bh_enable_ip+0x6a/0xd0
[   61.508742]  [<ffffffff838caa10>] ? _raw_read_unlock_bh+0x30/0x40
[   61.514952]  [<ffffffff835ad7b0>] pppol2tp_connect+0x10f0/0x1910
[   61.521084]  [<ffffffff835ac6c0>] ? pppol2tp_recv+0x320/0x320
[   61.526967]  [<ffffffff81c55f5f>] ? security_socket_connect+0x8f/0xc0
[   61.533542]  [<ffffffff82f266a8>] SYSC_connect+0x1b8/0x300
[   61.539137]  [<ffffffff82f264f0>] ? SYSC_bind+0x280/0x280
[   61.544651]  [<ffffffff8157ee30>] ? get_unused_fd_flags+0xd0/0xd0
[   61.550858]  [<ffffffff812d5890>] ? compat_SyS_get_robust_list+0x310/0x310
[   61.557849]  [<ffffffff82f28711>] ? SyS_socket+0x121/0x1b0
[   61.563463]  [<ffffffff82f285f0>] ? move_addr_to_kernel+0x50/0x50
[   61.569685]  [<ffffffff82f28fe4>] SyS_connect+0x24/0x30
[   61.575026]  [<ffffffff82f28fc0>] ? SyS_accept+0x30/0x30
[   61.580574]  [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0
[   61.586698]  [<ffffffff838cca03>] sysenter_flags_fixed+0xd/0x1a
[   61.592733] 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 
[   61.619803] RIP  [<ffffffff835a93b8>] l2tp_session_create+0x948/0x1030
[   61.626567]  RSP <ffff8800af047ad0>
[   61.630163] CR2: 0000000000000080
[   61.635195] ---[ end trace 8cea79677cea6dc1 ]---
[   61.639962] Kernel panic - not syncing: Fatal exception
[   61.645589] Dumping ftrace buffer:
[   61.649111]    (ftrace buffer empty)
[   61.652793] Kernel Offset: disabled
[   61.656398] Rebooting in 86400 seconds..