rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=b22c/1/0x4000000000000000 softirq=86105/86106 fqs=5249
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     6120          0            0
rcu: 	cputime:      267          0        52207   ==> 52510(ms)
rcu: 	(t=10502 jiffies g=47125 q=1140 ncpus=2)
CPU: 0 UID: 0 PID: 14804 Comm: syz.2.2276 Not tainted 6.17.0-rc1-syzkaller-00036-gdfc0f6373094 #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_is_watching+0x5a/0xb0
Code: f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 1c b7 7c 00 48 c7 c3 98 6f a1 92 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 <84> c0 75 34 8b 03 65 ff 0d 49 e2 f9 10 74 11 83 e0 04 c1 e8 02 5b
RSP: 0018:ffffc90007b46ec0 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: ffff88804b032f98 RCX: 88e3dae091c89200
RDX: ffff8880418f1cc0 RSI: ffffffff8be333e0 RDI: ffffffff8be333a0
RBP: 0000000000000001 R08: ffff8880418f1cc0 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000000 R12: ffff88811c830038
R13: dffffc0000000000 R14: ffffffff8dbded10 R15: dffffc0000000000
FS:  00007f4d7dbf66c0(0000) GS:ffff8880b861c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000200 CR3: 0000000045f0a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 rcu_read_lock_held+0x15/0x50
 qdisc_lookup_rcu+0x381/0x6d0
 qdisc_tree_reduce_backlog+0x1b2/0x480
 fq_codel_change+0xa96/0xef0
 fq_codel_init+0x355/0x960
 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+0x52d/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __sys_sendmmsg+0x227/0x430
 __x64_sys_sendmmsg+0xa0/0xc0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4d7f98ebe9
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:00007f4d7dbf6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f4d7fbb5fa0 RCX: 00007f4d7f98ebe9
RDX: 040000000000009f RSI: 00002000000002c0 RDI: 0000000000000005
RBP: 00007f4d7fa11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4d7fbb6038 R14: 00007f4d7fbb5fa0 R15: 00007ffe355dc108
 </TASK>
