batman_adv: Cannot find parent device
BUG: unable to handle page fault for address: fffffbfff887b6d0
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 21ffed067 P4D 21ffed067 PUD 21ffec067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 1069 Comm: syz-executor.5 Not tainted 5.2.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:fl_dump_key+0xbf/0x15b0 net/sched/cls_flower.c:2123
Code: 40 1c 04 f2 f2 f2 c7 40 20 f2 f2 f2 f2 c7 40 24 04 f2 f2 f2 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 48 89 c8 48 c1 e8 03 <0f> b6 04 10 84 c0 74 08 3c 03 0f 8e 17 12 00 00 41 8b 04 24 85 c0
RSP: 0018:ffff888034567200 EFLAGS: 00010a03
RAX: 1ffffffff887b6d0 RBX: ffffffffc43db4df RCX: ffffffffc43db687
RDX: dffffc0000000000 RSI: ffff8880a0d78140 RDI: ffff88809f7df500
RBP: ffff8880345673a8 R08: 0000000000000e88 R09: ffff888038c92a7c
R10: ffffed100719254e R11: ffff888038c92a76 R12: ffffffffc43db687
R13: ffff88809f7df500 R14: ffff888034567380 R15: ffff8880a0d78140
FS:  00007f76b9336700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffbfff887b6d0 CR3: 0000000032a20000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 fl_tmplt_dump+0xad/0x230 net/sched/cls_flower.c:2390
 tc_chain_fill_node+0x436/0x8c0 net/sched/cls_api.c:2679
 tc_chain_notify+0x17a/0x310 net/sched/cls_api.c:2705
 tc_ctl_chain+0x8a2/0xec6 net/sched/cls_api.c:2885
 rtnetlink_rcv_msg+0x34f/0x950 net/core/rtnetlink.c:5214
 netlink_rcv_skb+0x13c/0x380 net/netlink/af_netlink.c:2477
 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:5232
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x43b/0x650 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x666/0xc50 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xac/0xf0 net/socket.c:665
 ___sys_sendmsg+0x647/0x950 net/socket.c:2286