Oops: general protection fault, probably for non-canonical address 0xdffffc0000000035: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000001a8-0x00000000000001af]
CPU: 1 UID: 0 PID: 9542 Comm: syz.1.1179 Not tainted 6.16.0-rc3-syzkaller-00159-g223e2288f4b8 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:htb_qlen_notify+0x31/0xc0
Code: 41 56 41 55 41 54 53 49 89 f6 49 89 ff 49 bc 00 00 00 00 00 fc ff df e8 7d a6 3e f8 49 8d 9e a8 01 00 00 49 89 dd 49 c1 ed 03 <43> 0f b6 44 25 00 84 c0 75 4d 8b 2b 31 ff 89 ee e8 9a aa 3e f8 85
RSP: 0018:ffffc900048eefb0 EFLAGS: 00010206
RAX: ffffffff8981b7f3 RBX: 00000000000001a8 RCX: ffff888027ae5640
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88811c02e000
RBP: dffffc0000000000 R08: ffff888027ae5640 R09: 0000000000000002
R10: 00000000ffffffff R11: ffffffff8981b7d0 R12: dffffc0000000000
R13: 0000000000000035 R14: 0000000000000000 R15: ffff88811c02e000
FS:  00007fb784a6c6c0(0000) GS:ffff8881a3c1d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb784a4afc8 CR3: 0000000111c7a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 qdisc_tree_reduce_backlog+0x29c/0x480
 fq_change+0x1519/0x1f50
 fq_init+0x699/0x960
 qdisc_create+0x7ac/0xea0
 tc_modify_qdisc+0x1426/0x2010
 rtnetlink_rcv_msg+0x77c/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x75b/0x8d0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb783b8e929
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb784a6c038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fb783db5fa0 RCX: 00007fb783b8e929
RDX: 0000000000004000 RSI: 0000200000000280 RDI: 0000000000000003
RBP: 00007fb783c10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb783db5fa0 R15: 00007fff0d183078
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:htb_qlen_notify+0x31/0xc0
Code: 41 56 41 55 41 54 53 49 89 f6 49 89 ff 49 bc 00 00 00 00 00 fc ff df e8 7d a6 3e f8 49 8d 9e a8 01 00 00 49 89 dd 49 c1 ed 03 <43> 0f b6 44 25 00 84 c0 75 4d 8b 2b 31 ff 89 ee e8 9a aa 3e f8 85
RSP: 0018:ffffc900048eefb0 EFLAGS: 00010206
RAX: ffffffff8981b7f3 RBX: 00000000000001a8 RCX: ffff888027ae5640
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88811c02e000
RBP: dffffc0000000000 R08: ffff888027ae5640 R09: 0000000000000002
R10: 00000000ffffffff R11: ffffffff8981b7d0 R12: dffffc0000000000
R13: 0000000000000035 R14: 0000000000000000 R15: ffff88811c02e000
FS:  00007fb784a6c6c0(0000) GS:ffff8881a3c1d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb784a4afc8 CR3: 0000000111c7a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
