BUG: unable to handle kernel NULL pointer dereference at           (null)
IP:           (null)
PGD 81f9e067 P4D 81f9e067 PUD a0b64067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 7152 Comm: syz-executor.4 Not tainted 4.14.146 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88805d2345c0 task.stack: ffff88805d238000
RIP: 0010:          (null)
RSP: 0018:ffff88805d23f5e8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffffff86f15e00 RCX: ffffc9000ca73000
RDX: 1ffffffff0de2bc8 RSI: 0000000000000001 RDI: ffff8880a82064c0
RBP: ffff88805d23f6c0 R08: 1ffff1100ba47ee8 R09: ffff88805d23f740
R10: ffffed100ba47ef3 R11: ffff88805d23f79f R12: ffff88805d23f698
R13: ffff8880a82064c0 R14: 0000000000000001 R15: 0000000000000000
FS:  00007f3ceab3d700(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000008826b000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tc_bind_tclass+0x124/0x400 net/sched/sch_api.c:1697
 tc_ctl_tclass+0x94a/0xa70 net/sched/sch_api.c:1831
 rtnetlink_rcv_msg+0x3eb/0xb70 net/core/rtnetlink.c:4285
 netlink_rcv_skb+0x14f/0x3c0 net/netlink/af_netlink.c:2432
 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4297
 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline]
 netlink_unicast+0x45d/0x640 net/netlink/af_netlink.c:1312
 netlink_sendmsg+0x7c4/0xc60 net/netlink/af_netlink.c:1877
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xce/0x110 net/socket.c:656
 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062
 __sys_sendmsg+0xb9/0x140 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2103
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459a09
RSP: 002b:00007f3ceab3cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a09
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3ceab3d6d4
R13: 00000000004c7933 R14: 00000000004dd328 R15: 00000000ffffffff
Code:  Bad RIP value.
RIP:           (null) RSP: ffff88805d23f5e8
CR2: 0000000000000000
---[ end trace a7ad2f47b0516cfc ]---
kobject: 'loop2' (ffff8880a49a57e0): kobject_uevent_env