IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready 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 16360 ns 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 1d98f4067 [ 29.086368] PUD 1d8734067 Oops: 0002 [#1] PREEMPT SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 4250 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: ffff8801d62a8000 task.stack: ffff8801d68a8000 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:ffff8801d68afac0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff8801da30e780 RCX: 1ffff1003ac5511d RDX: 1ffff1003b31aab0 RSI: ffff8801d62a88c8 RDI: ffff8801d98d5580 RBP: ffff8801d68afb60 R08: ffff8801d62a88e8 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d98d5458 R13: 0000000000000000 R14: ffff8801d98d5400 R15: ffff8801d68afc78 FS: 00007f55b5f40700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000080 CR3: 00000001da321000 CR4: 00000000001606f0 Stack: 0000000000000201 ffffffff836ca141 ffff8801d68afae0 ffffffff81237f0d ffff8801d98d5400 ffff8801da30e8d8 ffff8801d98d5458 ffff8801da30e8d0 ffff8801da30e830 ffff8801d98d5420 0000000000000000 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 258499dbad01c2f7 ]---