rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10499 ticks this GP) idle=3044/1/0x4000000000000000 softirq=66102/66102 fqs=5219
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     5259          0            0
rcu: 	cputime:      288          0        52165   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=53685 q=1776 ncpus=2)
CPU: 1 UID: 0 PID: 17080 Comm: syz.0.3668 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:rcu_lockdep_current_cpu_online+0xa2/0x120
Code: 6f a2 92 48 89 f8 48 c1 e8 03 42 80 3c 30 00 74 05 e8 32 79 7c 00 4c 8b 7b 28 48 83 c3 20 48 89 d8 48 c1 e8 03 42 80 3c 30 00 <74> 08 48 89 df e8 14 79 7c 00 48 8b 1b 48 83 c3 70 48 89 d8 48 c1
RSP: 0018:ffffc90006ac6fc0 EFLAGS: 00000246
RAX: 1ffff11026cc75f4 RBX: ffff88813663afa0 RCX: 814123a66ab32b00
RDX: ffff88810bcd9cc0 RSI: ffffffff8be33860 RDI: ffff88813663afa8
RBP: 0000000000000001 R08: ffff88810bcd9cc0 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000002 R12: ffff88810a9f8038
R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000002
FS:  00007f6969e5b6c0(0000) GS:ffff8881a3c14000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6969e5afc8 CR3: 0000000123edc000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 rcu_read_lock_held+0x1e/0x50
 qdisc_lookup_rcu+0x32b/0x6d0
 qdisc_tree_reduce_backlog+0x1b2/0x480
 fq_pie_change+0xa74/0xf20
 fq_pie_init+0x38d/0x840
 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: 0033:0x7f6968f8ebe9
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:00007f6969e5b038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f69691c5fa0 RCX: 00007f6968f8ebe9
RDX: 00000000000400c4 RSI: 0000200000000080 RDI: 0000000000000003
RBP: 00007f6969011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f69691c6038 R14: 00007f69691c5fa0 R15: 00007ffeb4066cf8
 </TASK>
