[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.547697] 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: [ 23.036734] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 23.416462] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 24.148331] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) [ 24.324874] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) Warning: Permanently added '10.128.10.4' (ECDSA) to the list of known hosts. [ 29.847626] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) 2018/08/22 22:23:03 parsed 1 programs [ 31.346457] random: cc1: uninitialized urandom read (8 bytes read, 76 bits of entropy available) 2018/08/22 22:23:05 executed programs: 0 [ 32.448921] IPVS: Creating netns size=2552 id=1 [ 32.689175] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 32.703343] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 32.783995] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 32.799207] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 32.880837] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 32.895680] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 32.912519] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 32.929365] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 33.663188] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 33.703295] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 34.030645] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 34.039005] IP: [] l2tp_session_create+0x948/0x1030 [ 34.045679] PGD 1d80fd067 PUD 1cae79067 PMD 0 [ 34.050582] Oops: 0002 [#1] PREEMPT SMP KASAN [ 34.055614] Dumping ftrace buffer: [ 34.059125] (ftrace buffer empty) [ 34.062916] Modules linked in: [ 34.066211] CPU: 0 PID: 4179 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #20 [ 34.073917] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.083347] task: ffff8800af5f4800 task.stack: ffff8801d82f0000 [ 34.089474] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 34.098576] RSP: 0018:ffff8801d82f7ad0 EFLAGS: 00010246 [ 34.104001] RAX: 0000000000000000 RBX: ffff8801caef3400 RCX: 0000000000000006 [ 34.111306] RDX: 1ffff100395de6b0 RSI: ffffffff835a4543 RDI: ffff8801caef3580 [ 34.118598] RBP: ffff8801d82f7b40 R08: ffff8800af5f5100 R09: 0000000000000000 [ 34.125849] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801caef2828 [ 34.133214] R13: ffff8801d82f7c58 R14: ffff8801caef2780 R15: ffffffff835a3170 [ 34.140479] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7787b40 [ 34.148692] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 34.154644] CR2: 0000000000000080 CR3: 00000001d8349000 CR4: 00000000001606f0 [ 34.161893] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.169273] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.176527] Stack: [ 34.178902] ffffffff81140a6a ffff8801caef3420 ffff8801caef28d8 ffff8801caef2790 [ 34.186890] ffffffff838cba90 ffff8801caef2830 ffff8801caef28d0 ffff8801caef34e0 [ 34.194935] ffffffff00000000 ffff8800b11eee80 0000000000000000 ffff8800b11eeeb0 [ 34.203018] Call Trace: [ 34.205579] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 34.211984] [] ? _raw_read_unlock_bh+0x30/0x40 [ 34.218324] [] pppol2tp_connect+0x10f0/0x1910 [ 34.224451] [] ? pppol2tp_recv+0x320/0x320 [ 34.230312] [] ? security_socket_connect+0x8f/0xc0 [ 34.236873] [] SYSC_connect+0x1b8/0x300 [ 34.242473] [] ? SYSC_bind+0x280/0x280 [ 34.247981] [] ? get_unused_fd_flags+0xd0/0xd0 [ 34.254187] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 34.261173] [] ? SyS_dup2+0x3c5/0x5e0 [ 34.266595] [] SyS_connect+0x24/0x30 [ 34.271933] [] ? SyS_accept+0x30/0x30 [ 34.277470] [] do_fast_syscall_32+0x324/0x8b0 [ 34.283590] [] sysenter_flags_fixed+0xd/0x1a [ 34.289615] 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 [ 34.316867] RIP [] l2tp_session_create+0x948/0x1030 [ 34.323703] RSP [ 34.327367] CR2: 0000000000000080 [ 34.332274] ---[ end trace 5e484fa56a128e39 ]--- [ 34.337746] Kernel panic - not syncing: Fatal exception [ 34.343475] Dumping ftrace buffer: [ 34.346989] (ftrace buffer empty) [ 34.350673] Kernel Offset: disabled [ 34.354271] Rebooting in 86400 seconds..