rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10500 ticks this GP) idle=c784/1/0x4000000000000000 softirq=35174/35174 fqs=1385
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     2787          0            0
rcu: 	cputime:      211          0        27598   ==> 27810(ms)
rcu: 	(t=10500 jiffies g=26337 q=24210 ncpus=2)
CPU: 1 UID: 0 PID: 10296 Comm: syz.1.1242 Not tainted 6.16.0-rc5-syzkaller-00212-g9f735b6f8a77-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:qdisc_tree_reduce_backlog+0x313/0x480
Code: 48 01 00 00 4c 89 e8 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 a0 00 00 00 48 8b 44 24 18 41 01 45 00 e9 d7 fd ff ff e8 ad 08 49 f8 <e9> f4 fe ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c d4 fd ff ff 48
RSP: 0018:ffffc90001bfefc8 EFLAGS: 00000246
RAX: ffffffff89772393 RBX: 1ffffffff192d558 RCX: 0000000000080000
RDX: ffffc90003969000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffffff8c96aaa0 R08: ffff8880290a8000 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000002 R12: 00000000fffffff1
R13: ffff88802b89b800 R14: dffffc0000000000 R15: ffff88802b89b800
FS:  00007fbb5b5f66c0(0000) GS:ffff8881a3c26000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbb5b5f5fc8 CR3: 000000010e3a6000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 codel_change+0x859/0xae0
 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+0x75c/0x8e0
 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: 0033:0x7fbb5d78e9a9
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:00007fbb5b5f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fbb5d9b5fa0 RCX: 00007fbb5d78e9a9
RDX: 040000000000009f RSI: 00002000000002c0 RDI: 0000000000000007
RBP: 00007fbb5d810d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fbb5d9b5fa0 R15: 00007ffc1927a518
 </TASK>
