rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=e93c/1/0x4000000000000000 softirq=32080/32089 fqs=5209
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     5259          0            0
rcu: 	cputime:      337          0        52150   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=24749 q=1277 ncpus=2)
CPU: 0 UID: 0 PID: 9338 Comm: syz.0.1002 Not tainted 6.16.0-rc3-syzkaller-00159-g223e2288f4b8-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+0x228/0x480
Code: ab f8 4d 89 ef 85 db 74 0d e8 b4 dc 47 f8 4c 89 f5 e9 88 00 00 00 48 8b 6d 00 48 8d 45 20 48 89 c3 48 c1 eb 03 42 80 3c 33 00 <48> 89 04 24 74 0d 48 8b 3c 24 e8 49 60 ab f8 48 8b 04 24 48 83 38
RSP: 0018:ffffc90002cdefa8 EFLAGS: 00000246
RAX: ffffffff8c96a220 RBX: 1ffffffff192d444 RCX: 0000000000000002
RDX: ffff888108135640 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffffff8c96a200 R08: ffff888108135640 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000002 R12: 00000000fffffff1
R13: ffff888106b70800 R14: dffffc0000000000 R15: ffff888106b70800
FS:  00007f21223716c0(0000) GS:ffff8880b861d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcb4ee1000 CR3: 000000002798e000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 fq_codel_change+0xa96/0xef0
 fq_codel_init+0x355/0x960
 qdisc_create+0x7ac/0xea0
 tc_modify_qdisc+0x1426/0x2010
 rtnetlink_rcv_msg+0x77c/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x75b/0x8d0
 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: 0033:0x7f212158e929
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:00007f2122371038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f21217b5fa0 RCX: 00007f212158e929
RDX: 040000000000009f RSI: 00002000000002c0 RDI: 0000000000000006
RBP: 00007f2121610b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f21217b5fa0 R15: 00007ffcb4ee0be8
 </TASK>
