[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.062539] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.232653] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.431094] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 21.079959] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) [ 37.715327] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) Warning: Permanently added '10.128.10.19' (ECDSA) to the list of known hosts. [ 43.242207] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) 2018/08/22 11:42:13 parsed 1 programs [ 44.238427] random: cc1: uninitialized urandom read (8 bytes read, 80 bits of entropy available) 2018/08/22 11:42:15 executed programs: 0 [ 45.573906] IPVS: Creating netns size=2552 id=1 [ 45.783108] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 45.797218] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 45.869065] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 45.881529] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 45.951690] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 45.966273] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 45.980811] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 45.995521] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 46.623084] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 46.659634] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 47.237829] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 47.246142] IP: [] l2tp_session_create+0x948/0x1030 [ 47.252816] PGD 1d8e23067 PUD 1d48a9067 PMD 0 [ 47.257721] Oops: 0002 [#1] PREEMPT SMP KASAN [ 47.262681] Dumping ftrace buffer: [ 47.266188] (ftrace buffer empty) [ 47.269866] Modules linked in: [ 47.273163] CPU: 0 PID: 4363 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #84 [ 47.280763] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.290100] task: ffff8800b8f4b000 task.stack: ffff8801d6488000 [ 47.296123] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 47.305218] RSP: 0018:ffff8801d648fb48 EFLAGS: 00010246 [ 47.310636] RAX: 0000000000000000 RBX: ffff8800b9497b80 RCX: 0000000000000006 [ 47.317877] RDX: 1ffff10017292fa0 RSI: ffffffff835a4543 RDI: ffff8800b9497d00 [ 47.325123] RBP: ffff8801d648fbb8 R08: ffff8800b8f4b900 R09: 0000000000000000 [ 47.332379] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8800b94979a8 [ 47.339620] R13: ffff8801d648fcd0 R14: ffff8800b9497900 R15: ffffffff835a3170 [ 47.346861] FS: 00007f7ff3d09700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 47.355057] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.360967] CR2: 0000000000000080 CR3: 00000001d8b27000 CR4: 00000000001606f0 [ 47.368216] Stack: [ 47.370337] ffffffff81140a6a ffff8800b9497ba0 ffff8800b9497a58 ffff8800b9497910 [ 47.378342] ffffffff838cba90 ffff8800b94979b0 ffff8800b9497a50 ffff8800b9497c60 [ 47.386327] ffffffff00000000 ffff8800b8debb80 0000000000000000 ffff8800b8debbb0 [ 47.394423] Call Trace: [ 47.396997] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 47.403292] [] ? _raw_read_unlock_bh+0x30/0x40 [ 47.409502] [] pppol2tp_connect+0x10f0/0x1910 [ 47.415621] [] ? pppol2tp_recv+0x320/0x320 [ 47.421481] [] ? security_socket_connect+0x8f/0xc0 [ 47.428059] [] SYSC_connect+0x1b8/0x300 [ 47.433657] [] ? SYSC_bind+0x280/0x280 [ 47.439169] [] ? get_unused_fd_flags+0xd0/0xd0 [ 47.445375] [] ? do_futex+0x17f0/0x17f0 [ 47.450983] [] ? SyS_socket+0x121/0x1b0 [ 47.456580] [] ? move_addr_to_kernel+0x50/0x50 [ 47.462783] [] SyS_connect+0x24/0x30 [ 47.468118] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 47.474666] 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 [ 47.501622] RIP [] l2tp_session_create+0x948/0x1030 [ 47.508378] RSP [ 47.511975] CR2: 0000000000000080 [ 47.516463] ---[ end trace 0954c0bf68331f5f ]--- [ 47.521202] Kernel panic - not syncing: Fatal exception [ 47.526774] Dumping ftrace buffer: [ 47.530288] (ftrace buffer empty) [ 47.533975] Kernel Offset: disabled [ 47.537573] Rebooting in 86400 seconds..