rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10500 ticks this GP) idle=2464/1/0x4000000000000000 softirq=421656/421656 fqs=5248
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     5776          0            0
rcu: 	cputime:      272          0        52184   ==> 52500(ms)
rcu: 	(t=10502 jiffies g=112337 q=3192 ncpus=2)
CPU: 0 UID: 0 PID: 26676 Comm: syz.0.5332 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:__sanitizer_cov_trace_pc+0x18/0x70
Code: cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 08 80 a0 92 65 8b 15 e8 d4 e0 10 <81> e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 3c 16 00 00
RSP: 0018:ffffc900072d7028 EFLAGS: 00000286
RAX: ffffffff89847d48 RBX: 00000000ffff0000 RCX: ffff888044a41cc0
RDX: 0000000000000201 RSI: 00000000ffff0000 RDI: ffff888110f40000
RBP: dffffc0000000000 R08: ffff888044a41cc0 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000002 R12: 00000000fffffff1
R13: ffff888119371148 R14: dffffc0000000000 R15: ffff888110f40000
FS:  00007efd0df956c0(0000) GS:ffff8880b8618000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000481fe000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 qdisc_lookup_rcu+0x18/0x6d0
 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+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efd0d18ebe9
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:00007efd0df95038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007efd0d3b5fa0 RCX: 00007efd0d18ebe9
RDX: 000000000000c010 RSI: 0000200000000280 RDI: 0000000000000018
RBP: 00007efd0d211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efd0d3b6038 R14: 00007efd0d3b5fa0 R15: 00007ffce8214f28
 </TASK>
