rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=8fd4/1/0x4000000000000000 softirq=72947/72952 fqs=5217
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     5256          0            0
rcu: 	cputime:      304          0        52173   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=56301 q=3158 ncpus=2)
CPU: 0 UID: 0 PID: 15548 Comm: syz.0.2606 Not tainted 6.16.0-rc5-syzkaller-00159-g47c84997c686-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+0x223/0x480
Code: 89 ef e8 f0 01 ab f8 4d 89 ef 85 db 74 0d e8 34 7f 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 b9 01 ab f8 48 8b
RSP: 0018:ffffc900062770a8 EFLAGS: 00000a06
RAX: ffffffff8c96bb00 RBX: 1ffffffff192d760 RCX: 0000000000000000
RDX: ffff888104fbb980 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffffff8c96bae0 R08: ffff888104fbb980 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000000 R12: 00000000fffffff1
R13: ffff88811f229000 R14: dffffc0000000000 R15: ffff88811f229000
FS:  00007fb203e2e6c0(0000) GS:ffff8880b861b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000005008 CR3: 00000001093d8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 pie_change+0x96d/0xca0
 pie_init+0x2a3/0x3f0
 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+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb202f8e929
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:00007fb203e2e038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fb2031b5fa0 RCX: 00007fb202f8e929
RDX: 0000000000000000 RSI: 0000200000001200 RDI: 0000000000000004
RBP: 00007fb203010b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb2031b5fa0 R15: 00007ffe711a4978
 </TASK>
