rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=4174/1/0x4000000000000000 softirq=24523/24533 fqs=5249
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     8001          0            0
rcu: 	cputime:      229          0        52252   ==> 52500(ms)
rcu: 	(t=10502 jiffies g=14569 q=2980 ncpus=2)
CPU: 1 UID: 0 PID: 8077 Comm: syz.2.644 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:rcu_lockdep_current_cpu_online+0xba/0x120
Code: 7b 28 48 83 c3 20 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 a4 77 7c 00 48 8b 1b 48 83 c3 70 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 87 77 7c 00 4c 85 3b 75 1a 48 c7
RSP: 0018:ffffc90002aef0c0 EFLAGS: 00000a06
RAX: 1ffffffff1c2884e RBX: ffffffff8e144270 RCX: b454dc9ab79b3400
RDX: ffff888022930000 RSI: ffffffff8be28d20 RDI: ffff88813663afa8
RBP: 0000000000000001 R08: ffff888022930000 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000000 R12: ffff8880287a7838
R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000002
FS:  00007f796334d6c0(0000) GS:ffff8881a3c50000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000c80 CR3: 0000000113c0c000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 rcu_read_lock_held+0x1e/0x50
 qdisc_lookup_rcu+0x381/0x6d0
 qdisc_tree_reduce_backlog+0x1b2/0x480
 hhf_change+0x764/0xad0
 hhf_init+0x213/0x950
 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: 0033:0x7f796258e929
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:00007f796334d038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f79627b5fa0 RCX: 00007f796258e929
RDX: 0000000004000000 RSI: 0000200000000300 RDI: 0000000000000003
RBP: 00007f7962610b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f79627b5fa0 R15: 00007ffe3cc2f2d8
 </TASK>
