BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 9af54067 P4D 9af54067 PUD 97410067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9185 Comm: syz-executor.0 Not tainted 5.3.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff888082d8f690 EFLAGS: 00010246
RAX: 1ffffffff0fe82a9 RBX: 0000000000000001 RCX: ffff8880913fc440
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888096839400
RBP: ffff888082d8f730 R08: ffffffff85fa5817 R09: ffffffff85fa053a
R10: ffff8880913fc440 R11: 0000000000000003 R12: ffff888096839400
R13: dffffc0000000000 R14: 0000000080010002 R15: ffffffff87f41548
FS:  00007fa5136fe700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000000a4584000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tc_bind_tclass+0xd5/0x2b0 net/sched/sch_api.c:1923
 tc_ctl_tclass+0xaf1/0xea0 net/sched/sch_api.c:2059
 rtnetlink_rcv_msg+0x889/0xd40 net/core/rtnetlink.c:5223
 netlink_rcv_skb+0x19e/0x3d0 net/netlink/af_netlink.c:2477
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5241
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x787/0x900 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x993/0xc50 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:637 [inline]
 sock_sendmsg net/socket.c:657 [inline]
 ___sys_sendmsg+0x60d/0x910 net/socket.c:2311
 __sys_sendmsg net/socket.c:2356 [inline]
 __do_sys_sendmsg net/socket.c:2365 [inline]
 __se_sys_sendmsg net/socket.c:2363 [inline]
 __x64_sys_sendmsg+0x17c/0x200 net/socket.c:2363
 do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4598e9
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa5136fdc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004598e9
RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa5136fe6d4
R13: 00000000004c77fb R14: 00000000004dd098 R15: 00000000ffffffff
Modules linked in:
CR2: 0000000000000000
---[ end trace f84987ea07963c92 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff888082d8f690 EFLAGS: 00010246
RAX: 1ffffffff0fe82a9 RBX: 0000000000000001 RCX: ffff8880913fc440
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888096839400
RBP: ffff888082d8f730 R08: ffffffff85fa5817 R09: ffffffff85fa053a
R10: ffff8880913fc440 R11: 0000000000000003 R12: ffff888096839400
R13: dffffc0000000000 R14: 0000000080010002 R15: ffffffff87f41548
FS:  00007fa5136fe700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000000a4584000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400