[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.904256] 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: [ 26.175853] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.453485] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.187306] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 27.362551] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts. [ 32.928971] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) 2018/08/22 08:09:22 parsed 1 programs [ 34.096001] random: cc1: uninitialized urandom read (8 bytes read, 80 bits of entropy available) 2018/08/22 08:09:24 executed programs: 0 [ 35.512629] IPVS: Creating netns size=2552 id=1 [ 35.761537] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 35.777511] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 35.861887] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 35.877104] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 35.960210] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 35.975109] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 35.991545] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 36.009625] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 36.776104] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 36.817437] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 37.118926] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 37.157779] hrtimer: interrupt took 26056 ns [ 38.204299] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 40.305829] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 2018/08/22 08:09:29 executed programs: 161 [ 42.286251] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 43.144386] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 43.494584] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 45.185423] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 45.375727] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 45.384032] IP: [] l2tp_session_create+0x948/0x1030 [ 45.390729] PGD b6061067 PUD ac09f067 PMD 0 [ 45.395501] Oops: 0002 [#1] PREEMPT SMP KASAN [ 45.400450] Dumping ftrace buffer: [ 45.403967] (ftrace buffer empty) [ 45.407654] Modules linked in: [ 45.410958] CPU: 0 PID: 5813 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #84 [ 45.418563] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.427918] task: ffff8801d9546000 task.stack: ffff8800b8c20000 [ 45.433954] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 45.443135] RSP: 0018:ffff8800b8c27b48 EFLAGS: 00010246 [ 45.448564] RAX: 0000000000000000 RBX: ffff8801da1a5b80 RCX: 0000000000000006 [ 45.455822] RDX: 1ffff1003b434ba0 RSI: ffffffff835a4543 RDI: ffff8801da1a5d00 [ 45.463069] RBP: ffff8800b8c27bb8 R08: ffff8801d9546900 R09: 0000000000000000 [ 45.470326] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8800ab018aa8 [ 45.477574] R13: ffff8800b8c27cd0 R14: ffff8800ab018a00 R15: ffffffff835a3170 [ 45.484842] FS: 00007f5cb8d0a700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 45.493069] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 45.498949] CR2: 0000000000000080 CR3: 00000000ac0c2000 CR4: 00000000001606f0 [ 45.506212] Stack: [ 45.508342] ffffffff81140a6a ffff8801da1a5ba0 ffff8800ab018b58 ffff8800ab018a10 [ 45.516329] ffffffff838cba90 ffff8800ab018ab0 ffff8800ab018b50 ffff8801da1a5c60 [ 45.524327] ffffffff00000000 ffff8800b94fb300 0000000000000000 ffff8800b94fb330 [ 45.532320] Call Trace: [ 45.534888] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 45.541183] [] ? _raw_read_unlock_bh+0x30/0x40 [ 45.547406] [] pppol2tp_connect+0x10f0/0x1910 [ 45.553538] [] ? pppol2tp_recv+0x320/0x320 [ 45.559400] [] ? security_socket_connect+0x8f/0xc0 [ 45.565957] [] SYSC_connect+0x1b8/0x300 [ 45.571557] [] ? SYSC_bind+0x280/0x280 [ 45.577074] [] ? get_unused_fd_flags+0xd0/0xd0 [ 45.583342] [] ? do_futex+0x17f0/0x17f0 [ 45.588952] [] ? SyS_socket+0x121/0x1b0 [ 45.594554] [] ? move_addr_to_kernel+0x50/0x50 [ 45.600776] [] SyS_connect+0x24/0x30 [ 45.606119] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 45.612668] 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 [ 45.639857] RIP [] l2tp_session_create+0x948/0x1030 [ 45.646643] RSP [ 45.650242] CR2: 0000000000000080 [ 45.654799] ---[ end trace 5e8ef3870a724632 ]--- [ 45.659575] Kernel panic - not syncing: Fatal exception [ 45.665409] Dumping ftrace buffer: [ 45.668934] (ftrace buffer empty) [ 45.672620] Kernel Offset: disabled [ 45.676223] Rebooting in 86400 seconds..