rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=6a94/1/0x4000000000000000 softirq=52355/52361 fqs=5162
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     5253          0            0
rcu: 	cputime:      306          0        52164   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=40225 q=3955 ncpus=2)
CPU: 0 UID: 0 PID: 14514 Comm: syz.2.3712 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:lock_is_held_type+0x0/0x190
Code: 1f 09 f6 90 0f 0b 90 90 90 eb b5 e8 1a fc ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 10 65 48 8b 05
RSP: 0018:ffffc9000401efc0 EFLAGS: 00000202
RAX: 1ffffffff1c27e01 RBX: 00000000ffff0000 RCX: 5bb8cb978b88dc00
RDX: ffff888107a21cc0 RSI: 00000000ffffffff RDI: ffffffff8e13a0e0
RBP: 0000000000000001 R08: ffff888107a21cc0 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000002 R12: ffff8880284d6838
R13: dffffc0000000000 R14: ffff88811349e800 R15: ffff88801efe2478
FS:  00007f0c548b16c0(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001480 CR3: 000000011ae8a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 qdisc_lookup_rcu+0x32b/0x6d0
 qdisc_tree_reduce_backlog+0x1b2/0x480
 sfq_init+0x1a0f/0x2530
 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+0x52d/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __sys_sendmmsg+0x227/0x430
 __x64_sys_sendmmsg+0xa0/0xc0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0c5398eba9
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:00007f0c548b1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f0c53bd6090 RCX: 00007f0c5398eba9
RDX: 040000000000009f RSI: 00002000000002c0 RDI: 0000000000000009
RBP: 00007f0c53a11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0c53bd6128 R14: 00007f0c53bd6090 R15: 00007ffd5c20b058
 </TASK>
