[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.923013] 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: [ 25.178353] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.689542] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.369233] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) [ 51.604964] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) Warning: Permanently added '10.128.0.20' (ECDSA) to the list of known hosts. [ 57.074068] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) 2018/08/23 14:30:21 parsed 1 programs [ 58.333578] random: cc1: uninitialized urandom read (8 bytes read, 85 bits of entropy available) 2018/08/23 14:30:24 executed programs: 0 [ 60.020297] IPVS: Creating netns size=2552 id=1 [ 60.261843] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 60.277044] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 60.356903] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 60.372470] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 60.469947] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 60.484263] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 60.501357] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 60.519355] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 61.251661] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 61.289004] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 61.727594] l2tp_core: tunl 4: sockfd_lookup(fd=5) returned -9 [ 62.796587] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 62.804856] IP: [] l2tp_session_create+0x948/0x1030 [ 62.811537] PGD 1d39fc067 PUD 1d4077067 PMD 0 [ 62.816508] Oops: 0002 [#1] PREEMPT SMP KASAN [ 62.821467] Dumping ftrace buffer: [ 62.824978] (ftrace buffer empty) [ 62.828664] Modules linked in: [ 62.831957] CPU: 0 PID: 4590 Comm: syz-executor0 Not tainted 4.4.151-g37af2ff #85 [ 62.839549] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.848881] task: ffff8801d3da9800 task.stack: ffff8801c7788000 [ 62.854910] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 62.864045] RSP: 0018:ffff8801c778fb48 EFLAGS: 00010246 [ 62.869469] RAX: 0000000000000000 RBX: ffff8801da2e6c80 RCX: 0000000000000006 [ 62.876741] RDX: 1ffff1003b45cdc0 RSI: ffffffff835a4543 RDI: ffff8801da2e6e00 [ 62.883993] RBP: ffff8801c778fbb8 R08: ffff8801d3daa100 R09: 0000000000000000 [ 62.891247] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801da2e7228 [ 62.898509] R13: ffff8801c778fcd0 R14: ffff8801da2e7180 R15: ffffffff835a3170 [ 62.905757] FS: 00007fef5028b700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 62.913986] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 62.919843] CR2: 0000000000000080 CR3: 00000001d3d18000 CR4: 00000000001606f0 [ 62.927098] Stack: [ 62.929219] ffffffff81140a6a ffff8801da2e6ca0 ffff8801da2e72d8 ffff8801da2e7190 [ 62.937254] ffffffff838cba90 ffff8801da2e7230 ffff8801da2e72d0 ffff8801da2e6d60 [ 62.945275] ffffffff00000000 ffff8800b6b40880 0000000000000000 ffff8800b6b408b0 [ 62.953270] Call Trace: [ 62.955834] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 62.962133] [] ? _raw_read_unlock_bh+0x30/0x40 [ 62.968341] [] pppol2tp_connect+0x10f0/0x1910 [ 62.974463] [] ? pppol2tp_recv+0x320/0x320 [ 62.980340] [] ? security_socket_connect+0x8f/0xc0 [ 62.986896] [] SYSC_connect+0x1b8/0x300 [ 62.992497] [] ? SYSC_bind+0x280/0x280 [ 62.998011] [] ? get_unused_fd_flags+0xd0/0xd0 [ 63.004219] [] ? do_futex+0x17f0/0x17f0 [ 63.009822] [] ? SyS_socket+0x121/0x1b0 [ 63.015425] [] ? move_addr_to_kernel+0x50/0x50 [ 63.021635] [] SyS_connect+0x24/0x30 [ 63.026979] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 63.033533] 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 [ 63.060525] RIP [] l2tp_session_create+0x948/0x1030 [ 63.067351] RSP [ 63.070961] CR2: 0000000000000080 [ 63.075940] ---[ end trace 05f5ed202b4e1d40 ]--- [ 63.080696] Kernel panic - not syncing: Fatal exception [ 63.086372] Dumping ftrace buffer: [ 63.089892] (ftrace buffer empty) [ 63.093574] Kernel Offset: disabled [ 63.097177] Rebooting in 86400 seconds..