rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=3b0c/1/0x4000000000000000 softirq=95633/95634 fqs=5249
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     7568          0            0
rcu: 	cputime:      286          0        52200   ==> 52510(ms)
rcu: 	(t=10502 jiffies g=80029 q=3937 ncpus=2)
CPU: 1 UID: 0 PID: 21204 Comm: syz.0.4459 Not tainted 6.16.0-syzkaller-06600-g1dbf1d590d10-dirty #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+0xbf/0x120
Code: 20 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 24 2c 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 07 2c 7c 00 4c 85 3b 75 1a 48 c7 c7 c0 20 14 8e
RSP: 0018:ffffc90007956f00 EFLAGS: 00000246
RAX: 1ffffffff1c28306 RBX: ffffffff8e141830 RCX: 869c2a92f3fbfc00
RDX: ffff88803c451cc0 RSI: ffffffff8be309e0 RDI: ffff88813663af68
RBP: 0000000000000001 R08: ffff88803c451cc0 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000000 R12: 00000000fffffff1
R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000002
FS:  00007f01d2e836c0(0000) GS:ffff8881a3c80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000010000 CR3: 00000000399aa000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 rcu_read_lock_held+0x1e/0x50
 qdisc_lookup_rcu+0x68/0x6d0
 qdisc_tree_reduce_backlog+0x1b2/0x480
 fq_change+0x1519/0x1f50
 fq_init+0x699/0x960
 qdisc_create+0x7ac/0xea0
 tc_modify_qdisc+0x1538/0x20e0
 rtnetlink_rcv_msg+0x77c/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x82f/0x9e0
 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: 0033:0x7f01d1f8ebe9
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:00007f01d2e83038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f01d21b6090 RCX: 00007f01d1f8ebe9
RDX: 0000000000000000 RSI: 0000200000001200 RDI: 000000000000000b
RBP: 00007f01d2011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f01d21b6128 R14: 00007f01d21b6090 R15: 00007ffcfd426528
 </TASK>
