[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.771091] 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: [ 26.442829] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.675693] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.279707] random: sshd: uninitialized urandom read (32 bytes read, 60 bits of entropy available) [ 43.974437] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) Warning: Permanently added '10.128.10.9' (ECDSA) to the list of known hosts. [ 49.661568] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) 2018/08/25 08:17:25 parsed 1 programs [ 51.162250] random: cc1: uninitialized urandom read (8 bytes read, 74 bits of entropy available) 2018/08/25 08:17:27 executed programs: 0 [ 52.243047] IPVS: Creating netns size=2552 id=1 [ 52.491452] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 52.507029] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 52.593015] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 52.610770] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 52.691699] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 52.709682] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 52.725545] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 52.742951] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 52.786467] ip (3977) used greatest stack depth: 24432 bytes left [ 53.487379] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 53.525779] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 57.099057] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 57.107272] IP: [] l2tp_session_create+0x948/0x1030 [ 57.113950] PGD b5b86067 PUD ad85c067 PMD 0 [ 57.118706] Oops: 0002 [#1] PREEMPT SMP KASAN [ 57.123647] Dumping ftrace buffer: [ 57.127160] (ftrace buffer empty) [ 57.130845] Modules linked in: [ 57.134130] CPU: 0 PID: 5027 Comm: syz-executor0 Not tainted 4.4.152-ge5c5f1f #25 [ 57.141722] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.151049] task: ffff8801c8fd6000 task.stack: ffff8800b5bd0000 [ 57.157078] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 57.166184] RSP: 0018:ffff8800b5bd7ad0 EFLAGS: 00010246 [ 57.171604] RAX: 0000000000000000 RBX: ffff8801d27c2c80 RCX: 0000000000000006 [ 57.178847] RDX: 1ffff1003a4f85c0 RSI: ffffffff835a4993 RDI: ffff8801d27c2e00 [ 57.186093] RBP: ffff8800b5bd7b40 R08: 000000000000000a R09: 000000000000ffff [ 57.193337] R10: ffffed003a4f8648 R11: ffffffff8463a140 R12: ffff8801d27c3228 [ 57.200580] R13: ffff8800b5bd7c58 R14: ffff8801d27c3180 R15: ffffffff835a35c0 [ 57.207828] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7775b40 [ 57.216026] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 57.221879] CR2: 0000000000000080 CR3: 00000000b38f7000 CR4: 00000000001606f0 [ 57.230538] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 57.237799] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 57.245042] Stack: [ 57.247170] ffffffff81140a6a ffff8801d27c2ca0 ffff8801d27c32d8 ffff8801d27c3190 [ 57.255161] ffffffff838cbee0 ffff8801d27c3230 ffff8801d27c32d0 ffff8801d27c2d60 [ 57.263146] ffffffff00000000 ffff8801d0a5bb80 0000000000000000 ffff8801d0a5bbb0 [ 57.271129] Call Trace: [ 57.273697] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 57.279994] [] ? _raw_read_unlock_bh+0x30/0x40 [ 57.286201] [] pppol2tp_connect+0x10f0/0x1910 [ 57.292319] [] ? pppol2tp_recv+0x320/0x320 [ 57.298183] [] ? security_socket_connect+0x8f/0xc0 [ 57.304737] [] SYSC_connect+0x1b8/0x300 [ 57.310337] [] ? SYSC_bind+0x280/0x280 [ 57.315848] [] ? get_unused_fd_flags+0xd0/0xd0 [ 57.322054] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 57.329039] [] ? SyS_socket+0x121/0x1b0 [ 57.334638] [] ? move_addr_to_kernel+0x50/0x50 [ 57.340845] [] SyS_connect+0x24/0x30 [ 57.346187] [] ? SyS_accept+0x30/0x30 [ 57.351626] [] do_fast_syscall_32+0x324/0x8b0 [ 57.357760] [] sysenter_flags_fixed+0xd/0x1a [ 57.363786] 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 ff 80 80 00 00 00 48 8d 43 20 48 89 c7 48 89 45 b0 e8 f1 13 [ 57.390572] RIP [] l2tp_session_create+0x948/0x1030 [ 57.397336] RSP [ 57.400941] CR2: 0000000000000080 [ 57.404935] ---[ end trace c460aa9a21dec646 ]--- [ 57.410239] Kernel panic - not syncing: Fatal exception [ 57.415952] Dumping ftrace buffer: [ 57.419471] (ftrace buffer empty) [ 57.423159] Kernel Offset: disabled [ 57.426760] Rebooting in 86400 seconds..