[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.144690] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.057495] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.440288] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.207923] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) [ 38.896036] random: sshd: uninitialized urandom read (32 bytes read, 87 bits of entropy available) Warning: Permanently added '10.128.10.8' (ECDSA) to the list of known hosts. [ 44.666381] random: sshd: uninitialized urandom read (32 bytes read, 91 bits of entropy available) 2018/08/22 17:15:09 parsed 1 programs [ 45.988698] random: cc1: uninitialized urandom read (8 bytes read, 93 bits of entropy available) 2018/08/22 17:15:11 executed programs: 0 [ 47.452532] IPVS: Creating netns size=2552 id=1 [ 47.695444] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 47.709593] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 47.793567] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 47.808099] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 47.892861] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 47.907087] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 47.925404] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 47.941161] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 48.678610] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 48.716058] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 51.548742] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 51.557056] IP: [] l2tp_session_create+0x948/0x1030 [ 51.563741] PGD 1ceded067 PUD 1d1175067 PMD 0 [ 51.568715] Oops: 0002 [#1] PREEMPT SMP KASAN [ 51.573729] Dumping ftrace buffer: [ 51.577261] (ftrace buffer empty) [ 51.580946] Modules linked in: [ 51.584313] CPU: 0 PID: 4984 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #84 [ 51.591922] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.601250] task: ffff8801d03c0000 task.stack: ffff8801cd920000 [ 51.607281] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 51.616392] RSP: 0018:ffff8801cd927b48 EFLAGS: 00010246 [ 51.621817] RAX: 0000000000000000 RBX: ffff8800b564e280 RCX: 0000000000000006 [ 51.629062] RDX: 1ffff10016ac9c80 RSI: ffffffff835a4543 RDI: ffff8800b564e400 [ 51.636310] RBP: ffff8801cd927bb8 R08: ffff8801d03c0900 R09: 0000000000000000 [ 51.643558] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8800b564e828 [ 51.650806] R13: ffff8801cd927cd0 R14: ffff8800b564e780 R15: ffffffff835a3170 [ 51.658071] FS: 00007f740bf7e700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 51.666281] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 51.672149] CR2: 0000000000000080 CR3: 00000001d038b000 CR4: 00000000001606f0 [ 51.679569] Stack: [ 51.681692] ffffffff81140a6a ffff8800b564e2a0 ffff8800b564e8d8 ffff8800b564e790 [ 51.689737] ffffffff838cba90 ffff8800b564e830 ffff8800b564e8d0 ffff8800b564e360 [ 51.697740] ffffffff00000000 ffff8800b4304400 0000000000000000 ffff8800b4304430 [ 51.705772] Call Trace: [ 51.708346] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 51.714644] [] ? _raw_read_unlock_bh+0x30/0x40 [ 51.720856] [] pppol2tp_connect+0x10f0/0x1910 [ 51.727003] [] ? pppol2tp_recv+0x320/0x320 [ 51.732870] [] ? security_socket_connect+0x8f/0xc0 [ 51.739426] [] SYSC_connect+0x1b8/0x300 [ 51.745026] [] ? SYSC_bind+0x280/0x280 [ 51.750574] [] ? get_unused_fd_flags+0xd0/0xd0 [ 51.756790] [] ? do_futex+0x17f0/0x17f0 [ 51.762391] [] ? SyS_socket+0x121/0x1b0 [ 51.767992] [] ? move_addr_to_kernel+0x50/0x50 [ 51.774209] [] SyS_connect+0x24/0x30 [ 51.779574] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 51.786124] 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 [ 51.813201] RIP [] l2tp_session_create+0x948/0x1030 [ 51.819997] RSP [ 51.823596] CR2: 0000000000000080 [ 51.828524] ---[ end trace bc94494626d892b6 ]--- [ 51.833325] Kernel panic - not syncing: Fatal exception [ 51.839115] Dumping ftrace buffer: [ 51.842644] (ftrace buffer empty) [ 51.846329] Kernel Offset: disabled [ 51.849932] Rebooting in 86400 seconds..