[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.876697] 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: [ 25.831675] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 26.188848] random: sshd: uninitialized urandom read (32 bytes read, 43 bits of entropy available) [ 26.794931] random: sshd: uninitialized urandom read (32 bytes read, 58 bits of entropy available) [ 26.976928] random: sshd: uninitialized urandom read (32 bytes read, 61 bits of entropy available) Warning: Permanently added '10.128.10.34' (ECDSA) to the list of known hosts. [ 32.630822] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) 2018/08/22 07:49:34 parsed 1 programs [ 33.842935] random: cc1: uninitialized urandom read (8 bytes read, 67 bits of entropy available) 2018/08/22 07:49:36 executed programs: 0 [ 35.274321] IPVS: Creating netns size=2552 id=1 [ 35.529952] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 35.546758] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 35.625323] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 35.640810] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 35.720991] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 35.735519] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 35.750907] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 35.768352] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 35.812814] ip (3952) used greatest stack depth: 24432 bytes left [ 36.544988] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 36.587602] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 38.015745] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 38.023980] IP: [] l2tp_session_create+0x948/0x1030 [ 38.030670] PGD b7724067 PUD b8d60067 PMD 0 [ 38.035460] Oops: 0002 [#1] PREEMPT SMP KASAN [ 38.040441] Dumping ftrace buffer: [ 38.043952] (ftrace buffer empty) [ 38.047636] Modules linked in: [ 38.050920] CPU: 0 PID: 4622 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #84 [ 38.058509] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.067837] task: ffff8801d455b000 task.stack: ffff8800bb0d0000 [ 38.073872] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 38.083001] RSP: 0018:ffff8800bb0d7b48 EFLAGS: 00010246 [ 38.088437] RAX: 0000000000000000 RBX: ffff8801d49ad180 RCX: 0000000000000006 [ 38.095685] RDX: 1ffff1003a935a60 RSI: ffffffff835a4543 RDI: ffff8801d49ad300 [ 38.102950] RBP: ffff8800bb0d7bb8 R08: ffff8801d455b900 R09: 0000000000000000 [ 38.110193] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801d49acd28 [ 38.117455] R13: ffff8800bb0d7cd0 R14: ffff8801d49acc80 R15: ffffffff835a3170 [ 38.124712] FS: 00007f31afbe1700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 38.132909] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.138778] CR2: 0000000000000080 CR3: 00000000b7483000 CR4: 00000000001606f0 [ 38.146022] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.153266] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.160512] Stack: [ 38.162633] ffffffff81140a6a ffff8801d49ad1a0 ffff8801d49acdd8 ffff8801d49acc90 [ 38.170611] ffffffff838cba90 ffff8801d49acd30 ffff8801d49acdd0 ffff8801d49ad260 [ 38.178790] ffffffff00000000 ffff8800ae4bf700 0000000000000000 ffff8800ae4bf730 [ 38.186782] Call Trace: [ 38.189353] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 38.195700] [] ? _raw_read_unlock_bh+0x30/0x40 [ 38.201910] [] pppol2tp_connect+0x10f0/0x1910 [ 38.208028] [] ? pppol2tp_recv+0x320/0x320 [ 38.213888] [] ? security_socket_connect+0x8f/0xc0 [ 38.220440] [] SYSC_connect+0x1b8/0x300 [ 38.226035] [] ? SYSC_bind+0x280/0x280 [ 38.231547] [] ? get_unused_fd_flags+0xd0/0xd0 [ 38.237757] [] ? do_futex+0x17f0/0x17f0 [ 38.243356] [] ? SyS_socket+0x121/0x1b0 [ 38.248954] [] ? move_addr_to_kernel+0x50/0x50 [ 38.255169] [] SyS_connect+0x24/0x30 [ 38.260506] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 38.267051] 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 [ 38.293950] RIP [] l2tp_session_create+0x948/0x1030 [ 38.300712] RSP [ 38.304307] CR2: 0000000000000080 [ 38.310991] ---[ end trace 383f65dfb6f566b8 ]--- [ 38.315785] Kernel panic - not syncing: Fatal exception [ 38.321461] Dumping ftrace buffer: [ 38.324979] (ftrace buffer empty) [ 38.328664] Kernel Offset: disabled [ 38.332281] Rebooting in 86400 seconds..