rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=5014/1/0x4000000000000000 softirq=50494/50495 fqs=5248
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     6885          0            0
rcu: 	cputime:      302          0        52187   ==> 52500(ms)
rcu: 	(t=10502 jiffies g=27573 q=1884 ncpus=2)
CPU: 1 UID: 0 PID: 13411 Comm: syz.2.2196 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_pc+0x46/0x70
Code: ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 3c 16 00 00 00 74 2c 8b 91 18 16 00 00 83 fa 02 75 21 48 8b 91 20 16 00 00 48 8b 32 <48> 8d 7e 01 8b 89 1c 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2
RSP: 0018:ffffc9000479f008 EFLAGS: 00000246
RAX: ffffffff898491a9 RBX: 00000000ffff0000 RCX: ffff8881134c5640
RDX: ffffc9000a6b9000 RSI: 000000000007ffff RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff8881134c5640 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000002 R12: ffff88802e286038
R13: dffffc0000000000 R14: ffff88802e4da800 R15: ffff888106e10478
FS:  00007fc7ad11d6c0(0000) GS:ffff8881a3c1a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000012c9ca000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 qdisc_lookup_rcu+0x3d9/0x6d0
 qdisc_tree_reduce_backlog+0x1b2/0x480
 pie_change+0x913/0xc40
 pie_init+0x2a3/0x3f0
 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: 0033:0x7fc7ac38ebe9
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:00007fc7ad11d038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fc7ac5b5fa0 RCX: 00007fc7ac38ebe9
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000007
RBP: 00007fc7ac411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc7ac5b6038 R14: 00007fc7ac5b5fa0 R15: 00007ffc8cb9b0b8
 </TASK>
