rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=62bc/1/0x4000000000000000 softirq=39466/39472 fqs=5211
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     6607          0            0
rcu: 	cputime:      341          0        52137   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=26113 q=1747 ncpus=2)
CPU: 1 UID: 0 PID: 11262 Comm: syz.2.1619 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_lookup_rcu+0x0/0x6d0
Code: 80 c1 03 38 c1 0f 8c 2f fe ff ff 4c 89 f7 e8 97 a9 b3 f8 e9 22 fe ff ff 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <66> 0f 1f 00 55 41 57 41 56 41 55 41 54 53 89 f3 49 89 ff e8 d8 25
RSP: 0018:ffffc900082270a0 EFLAGS: 00000286
RAX: 1ffff11022475800 RBX: 0000000000000000 RCX: 0000000000000002
RDX: ffff888108bc0000 RSI: 00000000ffff0000 RDI: ffff88802220a000
RBP: dffffc0000000000 R08: ffff888108bc0000 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000002 R12: 00000000fffffff1
R13: ffff88803b768948 R14: dffffc0000000000 R15: ffff8881123ac000
FS:  00007f23ec2106c0(0000) GS:ffff8881a3c50000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000004640 CR3: 0000000106ed0000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 qdisc_tree_reduce_backlog+0x1b2/0x480
 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+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f23eb38e929
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:00007f23ec210038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f23eb5b5fa0 RCX: 00007f23eb38e929
RDX: 0000000000000000 RSI: 0000200000000640 RDI: 0000000000000006
RBP: 00007f23eb410b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f23eb5b5fa0 R15: 00007ffe780bcb08
 </TASK>
