rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=c6d4/1/0x4000000000000000 softirq=48997/48997 fqs=5212
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     6248          0            0
rcu: 	cputime:      289          0        52199   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=33429 q=2372 ncpus=2)
CPU: 0 UID: 0 PID: 12126 Comm: syz.2.1833 Not tainted syzkaller #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+0x8/0x120
Code: df e9 4e ff ff ff 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 <53> 65 8b 0d b0 27 fa 10 b0 01 f7 c1 00 00 f0 00 0f 85 d5 00 00 00
RSP: 0018:ffffc90002cfef08 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 531692f66aa8fd00
RDX: ffff888038935640 RSI: ffffffff8be33ee0 RDI: ffffffff8be33ea0
RBP: 0000000000000001 R08: ffff888038935640 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000000 R12: ffff88803565b038
R13: dffffc0000000000 R14: ffff888028ce8800 R15: ffff888029102478
FS:  00007f3fe56736c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001480 CR3: 000000001fa70000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 rcu_read_lock_held+0x1e/0x50
 qdisc_lookup_rcu+0x32b/0x6d0
 qdisc_tree_reduce_backlog+0x1b2/0x480
 codel_change+0x811/0xa90
 codel_init+0x1f7/0x3e0
 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: 0033:0x7f3fe478eba9
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:00007f3fe5673038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f3fe49d5fa0 RCX: 00007f3fe478eba9
RDX: 040000000000009f RSI: 00002000000002c0 RDI: 0000000000000006
RBP: 00007f3fe4811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3fe49d6038 R14: 00007f3fe49d5fa0 R15: 00007ffcc19873a8
 </TASK>
