rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=3444/1/0x4000000000000000 softirq=138096/138104 fqs=5218
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     5253          0            0
rcu: 	cputime:      292          0        52184   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=98913 q=4319 ncpus=2)
CPU: 0 UID: 0 PID: 23776 Comm: syz.1.4648 Not tainted syzkaller #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+0x200/0x480
Code: 3c 28 00 74 08 4c 89 ff e8 9d 26 9e f8 49 8b 2f 48 83 c5 08 48 89 e8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 ef e8 80 26 9e f8 <4d> 89 ef 85 db 74 0d e8 94 b2 3a f8 4c 89 f5 e9 88 00 00 00 48 8b
RSP: 0018:ffffc90006ec6f48 EFLAGS: 00000246
RAX: 1ffffffff1f483de RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888021869cc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffffff8fa41ef0 R08: ffff888021869cc0 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000000 R12: 00000000fffffff1
R13: ffff888123e7e800 R14: dffffc0000000000 R15: ffff888123e7e818
FS:  00007fe201a606c0(0000) GS:ffff8880b8614000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c320106 CR3: 00000001063e8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 fq_change+0xeba/0x2030
 fq_init+0x699/0x960
 qdisc_create+0x7ac/0xea0
 tc_modify_qdisc+0x1538/0x20e0
 rtnetlink_rcv_msg+0x77c/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x82f/0x9e0
 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: 0033:0x7fe200b8ebe9
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:00007fe201a60038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fe200dc6090 RCX: 00007fe200b8ebe9
RDX: 0000000004000004 RSI: 00002000000012c0 RDI: 000000000000000d
RBP: 00007fe200c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe200dc6128 R14: 00007fe200dc6090 R15: 00007fff34538208
 </TASK>
