BUG: kernel NULL pointer dereference, address: 0000000000000048
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 1023bb067 P4D 1023bb067 PUD 1017b0067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP
CPU: 0 PID: 3391 Comm: syz-executor.0 Not tainted 6.7.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:qdisc_block_add_dev net/sched/sch_api.c:1190 [inline]
RIP: 0010:qdisc_create+0x31b/0x980 net/sched/sch_api.c:1390
Code: 92 c3 31 ff 89 de e8 b4 16 fb fe 84 db 0f 85 20 03 00 00 e8 67 1b fb fe 48 8b 45 18 31 d2 be f2 ff 00 00 48 89 ef 4c 8b 68 08 <41> ff 55 48 48 85 c0 49 89 c6 74 5c e8 44 1b fb fe 49 63 9c 24 c0
RSP: 0018:ffffc900019678f8 EFLAGS: 00010246
RAX: ffffffff83a0ec20 RBX: 0000000000000001 RCX: ffffffff8232038c
RDX: 0000000000000000 RSI: 000000000000fff2 RDI: ffff888105f9e800
RBP: ffff888105f9e800 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff888107746000
R13: 0000000000000000 R14: ffffc900019679a0 R15: ffffffff83a0ec20
FS:  00007fd16f5006c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000048 CR3: 00000001032c6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 tc_modify_qdisc+0x714/0xd00 net/sched/sch_api.c:1788
 rtnetlink_rcv_msg+0x268/0x670 net/core/rtnetlink.c:6615
 netlink_rcv_skb+0x91/0x1d0 net/netlink/af_netlink.c:2543
 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
 netlink_unicast+0x43f/0x570 net/netlink/af_netlink.c:1367
 netlink_sendmsg+0x341/0x690 net/netlink/af_netlink.c:1908
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x52/0xa0 net/socket.c:745
 ____sys_sendmsg+0x337/0x3e0 net/socket.c:2584
 ___sys_sendmsg+0xc9/0x130 net/socket.c:2638
 __sys_sendmsg+0xa6/0x120 net/socket.c:2667
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fd16f97dce9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd16f5000c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fd16fa9cf80 RCX: 00007fd16f97dce9
RDX: 0000000000000000 RSI: 0000000020005840 RDI: 0000000000000003
RBP: 00007fd16f9ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000006 R14: 00007fd16fa9cf80 R15: 00007fff0f15a6e8
 </TASK>
Modules linked in:
CR2: 0000000000000048
---[ end trace 0000000000000000 ]---
RIP: 0010:qdisc_block_add_dev net/sched/sch_api.c:1190 [inline]
RIP: 0010:qdisc_create+0x31b/0x980 net/sched/sch_api.c:1390
Code: 92 c3 31 ff 89 de e8 b4 16 fb fe 84 db 0f 85 20 03 00 00 e8 67 1b fb fe 48 8b 45 18 31 d2 be f2 ff 00 00 48 89 ef 4c 8b 68 08 <41> ff 55 48 48 85 c0 49 89 c6 74 5c e8 44 1b fb fe 49 63 9c 24 c0
RSP: 0018:ffffc900019678f8 EFLAGS: 00010246
RAX: ffffffff83a0ec20 RBX: 0000000000000001 RCX: ffffffff8232038c
RDX: 0000000000000000 RSI: 000000000000fff2 RDI: ffff888105f9e800
RBP: ffff888105f9e800 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff888107746000
R13: 0000000000000000 R14: ffffc900019679a0 R15: ffffffff83a0ec20
FS:  00007fd16f5006c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000048 CR3: 00000001032c6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	92                   	xchg   %eax,%edx
   1:	c3                   	ret
   2:	31 ff                	xor    %edi,%edi
   4:	89 de                	mov    %ebx,%esi
   6:	e8 b4 16 fb fe       	call   0xfefb16bf
   b:	84 db                	test   %bl,%bl
   d:	0f 85 20 03 00 00    	jne    0x333
  13:	e8 67 1b fb fe       	call   0xfefb1b7f
  18:	48 8b 45 18          	mov    0x18(%rbp),%rax
  1c:	31 d2                	xor    %edx,%edx
  1e:	be f2 ff 00 00       	mov    $0xfff2,%esi
  23:	48 89 ef             	mov    %rbp,%rdi
  26:	4c 8b 68 08          	mov    0x8(%rax),%r13
* 2a:	41 ff 55 48          	call   *0x48(%r13) <-- trapping instruction
  2e:	48 85 c0             	test   %rax,%rax
  31:	49 89 c6             	mov    %rax,%r14
  34:	74 5c                	je     0x92
  36:	e8 44 1b fb fe       	call   0xfefb1b7f
  3b:	49                   	rex.WB
  3c:	63                   	.byte 0x63
  3d:	9c                   	pushf
  3e:	24 c0                	and    $0xc0,%al