rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=4834/1/0x4000000000000000 softirq=151133/151134 fqs=5238
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     7836          0            0
rcu: 	cputime:      226          0        52252   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=67505 q=8045 ncpus=2)
CPU: 0 UID: 0 PID: 22314 Comm: syz.2.4143 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:__sanitizer_cov_trace_switch+0x82/0x130
Code: 00 00 b9 01 00 00 00 48 85 c0 0f 84 b4 00 00 00 41 57 41 56 41 54 53 48 8b 54 24 20 65 4c 8b 04 25 08 60 a0 92 45 31 c9 eb 08 <49> ff c1 4c 39 c8 74 77 4e 8b 54 ce 10 65 44 8b 1d e9 ae e0 10 41
RSP: 0018:ffffc90007987040 EFLAGS: 00000293
RAX: 0000000000000002 RBX: ffff88811e66d83c RCX: 0000000000000005
RDX: ffffffff8984b55e RSI: ffffffff8f580640 RDI: 00000000fffffff1
RBP: dffffc0000000000 R08: ffff888042b1d640 R09: 0000000000000001
R10: 00000000ffffffff R11: 0000000000000000 R12: 00000000fffffff1
R13: ffff88811e66d948 R14: dffffc0000000000 R15: ffff88811e66d800
FS:  00007f8bedb6b6c0(0000) GS:ffff8880b861a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31d13ff8 CR3: 0000000029f1a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 qdisc_tree_reduce_backlog+0x10e/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+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8becd8ebe9
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:00007f8bedb6b038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f8becfc5fa0 RCX: 00007f8becd8ebe9
RDX: 0000000004008000 RSI: 00002000000012c0 RDI: 0000000000000005
RBP: 00007f8bece11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8becfc6038 R14: 00007f8becfc5fa0 R15: 00007fffd0aebdc8
 </TASK>
