rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=90a4/1/0x4000000000000000 softirq=28409/28424 fqs=5247
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     6029          0            0
rcu: 	cputime:      272          0        52227   ==> 52510(ms)
rcu: 	(t=10502 jiffies g=20037 q=965 ncpus=2)
CPU: 1 UID: 0 PID: 8655 Comm: syz.0.707 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:debug_lockdep_rcu_enabled+0x0/0x40
Code: 96 17 15 f6 90 0f 0b 90 90 90 eb c4 cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 31 c0 83 3d 67 f1 32 04 00 74 1e 83 3d 8a 21 33 04 00
RSP: 0018:ffffc9000271f048 EFLAGS: 00000246
RAX: 1ffff11006143003 RBX: 00000000ffff0000 RCX: 0000000000080000
RDX: ffffc900086eb000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 0000000000000001 R08: ffff8880321e1cc0 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000002 R12: ffff888123098038
R13: dffffc0000000000 R14: ffff888030b85800 R15: ffff88810ad76478
FS:  00007f13b6dbb6c0(0000) GS:ffff8881a3c1d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2b1f3f CR3: 0000000110d4c000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 qdisc_lookup_rcu+0x36d/0x6d0
 qdisc_tree_reduce_backlog+0x1b2/0x480
 fq_codel_change+0xa96/0xef0
 fq_codel_init+0x355/0x960
 qdisc_create+0x7ac/0xea0
 tc_modify_qdisc+0x1538/0x20e0
 rtnetlink_rcv_msg+0x77c/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x75b/0x8d0
 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: 0033:0x7f13b5f8e929
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:00007f13b6dbb038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f13b61b6080 RCX: 00007f13b5f8e929
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 000000000000000a
RBP: 00007f13b6010b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f13b61b6080 R15: 00007ffe19aa7438
 </TASK>
