rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=02b4/1/0x4000000000000000 softirq=53584/53585 fqs=5247
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     6960          0            0
rcu: 	cputime:      307          0        52192   ==> 52510(ms)
rcu: 	(t=10502 jiffies g=41725 q=1636 ncpus=2)
CPU: 1 UID: 0 PID: 13364 Comm: syz.2.2128 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_tree_reduce_backlog+0x1b2/0x480
Code: f8 4d 8b 3f 4c 89 f8 48 c1 e8 03 80 3c 28 00 74 08 4c 89 ff e8 2f 5e ab f8 49 8b 3f 44 89 e6 81 e6 00 00 ff ff e8 9e d6 ff ff <48> 85 c0 0f 84 18 02 00 00 49 89 c5 31 ff 89 de e8 89 de 47 f8 4d
RSP: 0018:ffffc9000460efe8 EFLAGS: 00000246
RAX: ffff88811c1ca000 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90008632000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: dffffc0000000000 R08: ffff88810b71d640 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000002 R12: 00000000fffffff1
R13: ffff88811c1ca148 R14: dffffc0000000000 R15: ffff88802689f000
FS:  00007f8a4ebee6c0(0000) GS:ffff8881a3c1d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8a4ebedfc8 CR3: 00000000421e2000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 fq_change+0x1519/0x1f50
 fq_init+0x699/0x960
 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: 0033:0x7f8a4dd8e929
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:00007f8a4ebee038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f8a4dfb6080 RCX: 00007f8a4dd8e929
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 000000000000000a
RBP: 00007f8a4de10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f8a4dfb6080 R15: 00007fff0297b268
 </TASK>
