rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=0f94/1/0x4000000000000000 softirq=32732/32733 fqs=5167
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     7687          0            0
rcu: 	cputime:      353          0        52126   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=20625 q=3412 ncpus=2)
CPU: 1 UID: 0 PID: 8862 Comm: syz.2.892 Not tainted 6.16.0-rc5-syzkaller-00159-g47c84997c686 #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_is_watching+0x44/0xb0
Code: 73 65 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd 70 ec bb 8d 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 2c 89 7c 00 <48> c7 c3 58 7f a1 92 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38
RSP: 0018:ffffc90002c4f040 EFLAGS: 00000246
RAX: 1ffffffff1b77d8f RBX: 0000000000000001 RCX: acb04554b18d4f00
RDX: ffff88811a833980 RSI: ffffffff8be29da0 RDI: ffffffff8be29d60
RBP: 0000000000000001 R08: ffff88811a833980 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000000 R12: 00000000fffffff1
R13: dffffc0000000000 R14: ffffffff8dbbec78 R15: dffffc0000000000
FS:  00007f854c84c6c0(0000) GS:ffff8881a3c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000002c0 CR3: 0000000027810000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 rcu_read_lock_held+0x15/0x50
 qdisc_lookup_rcu+0x68/0x6d0
 qdisc_tree_reduce_backlog+0x1b2/0x480
 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: 0033:0x7f854b98e929
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:00007f854c84c038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f854bbb5fa0 RCX: 00007f854b98e929
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000005
RBP: 00007f854ba10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f854bbb5fa0 R15: 00007fff8ecb55d8
 </TASK>
