IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready hrtimer: interrupt took 18203 ns l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 IP: [] sock_hold include/net/sock.h:584 [inline] IP: [] l2tp_session_create+0xc60/0x16f0 net/l2tp/l2tp_core.c:1911 PGD 1d6ed0067 [ 33.303078] PUD 1d6e7f067 Oops: 0002 [#1] PREEMPT SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 4221 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #79 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801d7341800 task.stack: ffff8801d6968000 RIP: 0010:[] [] sock_hold include/net/sock.h:584 [inline] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 net/l2tp/l2tp_core.c:1911 RSP: 0018:ffff8801d696fac0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff8801d6e03b80 RCX: 1ffff1003ae6841d RDX: 1ffff1003adbdcd0 RSI: ffff8801d73420c8 RDI: ffff8801d6dee680 RBP: ffff8801d696fb60 R08: ffff8801d73420e8 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d6dee558 R13: 0000000000000000 R14: ffff8801d6dee500 R15: ffff8801d696fc78 FS: 00007f4d48f3f700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000080 CR3: 00000001d6e0b000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: 0000000000000000 0000000000000004 ffff8801d60d0000 ffff8801d696fd20 ffff8801d6dee500 ffff8801d6e03cd8 ffff8801d6dee558 ffff8801d6e03cd0 ffff8801d6e03c30 ffff8801d6dee520 1ffff1003ae6841d 0000000000000000 Call Trace: [] pppol2tp_connect+0x10d7/0x18f0 net/l2tp/l2tp_ppp.c:718 [] SYSC_connect+0x1b8/0x300 net/socket.c:1563 [] SyS_connect+0x24/0x30 net/socket.c:1544 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb 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 RIP [] sock_hold include/net/sock.h:584 [inline] RIP [] l2tp_session_create+0xc60/0x16f0 net/l2tp/l2tp_core.c:1911 RSP CR2: 0000000000000080 ---[ end trace 8f0f7880fe3b3d10 ]---