rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=5bec/1/0x4000000000000000 softirq=82086/82088 fqs=5198
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     5252          0            0
rcu: 	cputime:      252          0        52200   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=49449 q=1633 ncpus=2)
CPU: 0 UID: 0 PID: 18337 Comm: syz.0.2899 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:check_preemption_disabled+0x40/0x120
Code: 08 65 8b 05 c6 9e 26 07 65 8b 0d bb 9e 26 07 f7 c1 ff ff ff 7f 74 23 65 48 8b 0d 9b 9e 26 07 48 3b 4c 24 08 0f 85 cc 00 00 00 <48> 83 c4 10 5b 41 5e 41 5f 5d e9 81 c9 02 00 cc 48 c7 04 24 00 00
RSP: 0018:ffffc9000311eec8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ae09c0fbcb8f1200
RDX: ffff88803a630000 RSI: ffffffff8be337e0 RDI: ffffffff8be337a0
RBP: 0000000000000001 R08: ffff88803a630000 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000002 R12: ffff888023103838
R13: dffffc0000000000 R14: ffff88803b339000 R15: ffff88802a8ae478
FS:  00007fbedc60e6c0(0000) GS:ffff8880b8618000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001480 CR3: 00000001111e4000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 rcu_is_watching+0x15/0xb0
 rcu_read_lock_held+0x15/0x50
 qdisc_lookup_rcu+0x381/0x6d0
 qdisc_tree_reduce_backlog+0x1b2/0x480
 codel_change+0x811/0xa90
 codel_init+0x1f7/0x3e0
 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: 0033:0x7fbedb78ebe9
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:00007fbedc60e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fbedb9c5fa0 RCX: 00007fbedb78ebe9
RDX: 040000000000009f RSI: 00002000000002c0 RDI: 0000000000000009
RBP: 00007fbedb811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbedb9c6038 R14: 00007fbedb9c5fa0 R15: 00007ffd0fd53538
 </TASK>
