[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.106652] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.877275] random: sshd: uninitialized urandom read (32 bytes read) [ 25.408026] random: sshd: uninitialized urandom read (32 bytes read) [ 25.919013] random: sshd: uninitialized urandom read (32 bytes read) [ 57.962339] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.33' (ECDSA) to the list of known hosts. [ 63.502918] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/17 23:27:20 parsed 1 programs [ 64.717700] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/17 23:27:22 executed programs: 0 [ 65.799190] IPVS: Creating netns size=2536 id=1 [ 65.833020] IPVS: Creating netns size=2536 id=2 [ 65.845173] IPVS: Creating netns size=2536 id=3 [ 65.864162] IPVS: Creating netns size=2536 id=4 [ 65.893092] IPVS: Creating netns size=2536 id=5 [ 65.912502] IPVS: Creating netns size=2536 id=6 [ 65.936274] IPVS: Creating netns size=2536 id=7 [ 65.955957] IPVS: Creating netns size=2536 id=8 [ 66.167444] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 66.214755] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 66.223207] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 66.260889] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 66.309640] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 66.336744] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 66.367302] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 66.388499] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 66.396765] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 66.409133] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 66.422803] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 66.448477] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 66.459427] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 66.469337] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 66.489061] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 66.503224] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 66.512573] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 66.527994] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 66.545242] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 66.556586] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 66.574924] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 66.584177] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 66.598047] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 66.606307] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 66.621584] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 66.637914] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 66.647821] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 66.670817] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 66.689829] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 66.699447] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 66.716665] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 66.733642] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 66.746909] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 66.755454] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 66.765406] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 66.790896] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 66.798565] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 66.813821] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 66.821203] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 66.828954] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 66.839044] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 66.852656] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 66.860353] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 66.876587] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 66.886876] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 66.906275] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 66.919155] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 66.930072] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 66.940614] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 66.954294] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 66.965413] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 66.977052] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 66.991390] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 66.999544] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 67.008022] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 67.018960] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 67.030355] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 67.038740] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 67.054379] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 67.063321] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 67.071099] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 67.078559] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 67.086402] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 67.094111] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 67.101594] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 67.109099] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 67.116817] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 67.124241] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 67.138527] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 67.148429] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 67.158751] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 67.166617] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 67.174562] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 67.182038] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 69.972761] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 69.994605] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 70.042967] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 70.122953] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 70.130960] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 70.140771] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 70.148745] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 70.156100] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 70.166703] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 70.175384] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 70.185262] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 70.231509] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 70.237693] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 70.245017] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 70.297708] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 70.317845] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 70.329706] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 70.340099] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 70.354070] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 70.362426] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 70.376680] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 70.389682] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 70.400528] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 70.488738] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 70.495697] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 70.503170] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 70.511412] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 70.518266] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 70.525109] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 70.577434] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 70.587830] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 70.595127] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready 2018/08/17 23:27:27 executed programs: 8 [ 72.310952] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 72.319273] IP: [] l2tp_session_create+0xc60/0x16f0 [ 72.326004] PGD 1d46ff067 [ 72.328665] PUD 1c1996067 PMD 0 [ 72.332175] [ 72.333801] Oops: 0002 [#1] PREEMPT SMP KASAN [ 72.338272] Dumping ftrace buffer: [ 72.341805] (ftrace buffer empty) [ 72.345499] Modules linked in: [ 72.348949] CPU: 1 PID: 7079 Comm: syz-executor2 Not tainted 4.9.121-g681e57b #25 [ 72.356546] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 72.365931] task: ffff8801ca74c800 task.stack: ffff8801b5d08000 [ 72.372189] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 72.381317] RSP: 0018:ffff8801b5d0fac0 EFLAGS: 00010246 [ 72.386744] RAX: 0000000000000000 RBX: ffff8801c0342780 RCX: 1ffff100394e9a1d [ 72.394009] RDX: 1ffff10036ce1030 RSI: ffff8801ca74d0c8 RDI: ffff8801b6708180 [ 72.401268] RBP: ffff8801b5d0fb60 R08: ffff8801ca74d0e8 R09: 0000000000000000 [ 72.408515] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801b6708058 [ 72.415783] R13: 0000000000000000 R14: ffff8801b6708000 R15: 0000000000000000 [ 72.423061] FS: 00007f0c82346700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 72.431266] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 72.437127] CR2: 0000000000000080 CR3: 00000001b8587000 CR4: 00000000001606f0 [ 72.444409] Stack: [ 72.446537] ffffffff836c70b7 ffffffff836c8151 ffff8801cf616e48 0000000000000000 [ 72.454607] ffff8801b6708000 ffff8801c03428d8 ffff8801b6708058 ffff8801c03428d0 [ 72.462639] ffff8801c0342830 ffff8801b6708020 ffff8801cf616600 0000000000000000 [ 72.470688] Call Trace: [ 72.473283] [] ? l2tp_session_create+0xed7/0x16f0 [ 72.479770] [] ? l2tp_session_get+0x1d1/0x790 [ 72.485902] [] pppol2tp_connect+0x10d7/0x18f0 [ 72.492052] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 72.498264] [] ? security_socket_connect+0x8f/0xc0 [ 72.504842] [] SYSC_connect+0x1b8/0x300 [ 72.510456] [] ? SYSC_bind+0x280/0x280 [ 72.515973] [] ? get_unused_fd_flags+0xd0/0xd0 [ 72.522185] [] ? do_futex+0x17c0/0x17c0 [ 72.527789] [] ? SyS_socket+0x121/0x1b0 [ 72.533391] [] ? move_addr_to_kernel+0x50/0x50 [ 72.539611] [] SyS_connect+0x24/0x30 [ 72.544962] [] ? SyS_accept+0x30/0x30 [ 72.550395] [] do_syscall_64+0x1a6/0x490 [ 72.556111] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 72.563023] Code: 00 00 49 8d be 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 7b 09 00 00 49 8b 86 80 01 00 00 ff 80 80 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 55 d0 [ 72.591113] RIP [] l2tp_session_create+0xc60/0x16f0 [ 72.597958] RSP [ 72.601559] CR2: 0000000000000080 [ 72.608845] ---[ end trace 335b0e5f06fa551e ]--- [ 72.613864] Kernel panic - not syncing: Fatal exception [ 72.619526] Dumping ftrace buffer: [ 72.623052] (ftrace buffer empty) [ 72.626736] Kernel Offset: disabled [ 72.630341] Rebooting in 86400 seconds..