rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=1774/1/0x4000000000000000 softirq=63945/63946 fqs=5228
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     6739          0            0
rcu: 	cputime:      238          0        52250   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=48929 q=1316 ncpus=2)
CPU: 0 UID: 0 PID: 13103 Comm: syz.0.1834 Not tainted 6.16.0-rc3-syzkaller-00159-g223e2288f4b8 #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+0x25/0x120
Code: 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 53 65 8b 0d 40 a6 f5 10 b0 01 f7 c1 00 00 f0 00 0f 85 d5 00 00 00 83 3d 03 b4 f9 0d 00 <0f> 84 c8 00 00 00 65 ff 05 1e a6 f5 10 e8 89 77 bf 09 89 c3 83 f8
RSP: 0018:ffffc9000255ef80 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000201
RDX: ffff8881098ad640 RSI: ffffffff8be28d20 RDI: ffffffff8be28ce0
RBP: 0000000000000001 R08: ffff8881098ad640 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000000 R12: ffff88802ff0a838
R13: dffffc0000000000 R14: ffff888113084400 R15: ffff8881109c0478
FS:  00007f0cd540a6c0(0000) GS:ffff8880b8650000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001200 CR3: 0000000027724000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 rcu_read_lock_held+0x1e/0x50
 qdisc_lookup_rcu+0x32b/0x6d0
 qdisc_tree_reduce_backlog+0x1b2/0x480
 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: 0033:0x7f0cd458e929
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:00007f0cd540a038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f0cd47b5fa0 RCX: 00007f0cd458e929
RDX: 0000000000000000 RSI: 0000200000001200 RDI: 0000000000000003
RBP: 00007f0cd4610b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f0cd47b5fa0 R15: 00007ffd1d1f13f8
 </TASK>
