rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10404 ticks this GP) idle=3fe4/1/0x4000000000000000 softirq=15558/15608 fqs=4722
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1141689        224            0
rcu: 	cputime:    31180      21297           47   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=8705 q=3438 ncpus=2)
CPU: 0 UID: 0 PID: 6088 Comm: syz.1.77 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:rcu_read_unlock_special+0x87/0x4b0
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 d2 b2 f9 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc90000007b00 EFLAGS: 00000206
RAX: 02e4a5ec883bf700 RBX: 1ffff92000000f64 RCX: 02e4a5ec883bf700
RDX: 0000000000000002 RSI: ffffffff8d9baa63 RDI: ffffffff8be34280
RBP: ffffc90000007be0 R08: ffffffff8fa3b237 R09: 1ffffffff1f47646
R10: dffffc0000000000 R11: fffffbfff1f47647 R12: ffffffff8e13f400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
FS:  00007f020454e6c0(0000) GS:ffff8880b8612000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efd56b5a866 CR3: 0000000028282000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 __rcu_read_unlock+0x84/0xe0
 ieee80211_rx_napi+0x228/0x3d0
 ieee80211_handle_queued_frames+0xe8/0x1f0
 tasklet_action_common+0x36c/0x580
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x175/0x360
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 7b 6f 03 11 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc900038af5f8 EFLAGS: 00000206
RAX: 02e4a5ec883bf700 RBX: 0000000000000000 RCX: 02e4a5ec883bf700
RDX: ffffffff9349b470 RSI: ffffffff8dbaa117 RDI: ffffffff8be34280
RBP: ffffffff81746d81 R08: 0000000000000008 R09: ffffffff95c345c0
R10: 00000000967f4771 R11: 0000000053c79367 R12: 0000000000000000
R13: ffffffff8dfab498 R14: 0000000000000001 R15: 0000000000000246
 _raw_spin_lock+0x2e/0x40
 pgd_free+0x51/0x1e0
 __mmdrop+0xb5/0x570
 finish_task_switch+0x3ee/0x950
 __schedule+0x17a0/0x4cc0
 preempt_schedule_common+0x83/0xd0
 preempt_schedule+0xae/0xc0
 preempt_schedule_thunk+0x16/0x30
 smp_call_function_single+0x470/0x590
 perf_install_in_context+0x593/0x8f0
 __se_sys_perf_event_open+0x193a/0x1d70
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f020378eba9
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:00007f020454e038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f02039d6090 RCX: 00007f020378eba9
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 00002000000003c0
RBP: 00007f0203811e19 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f02039d6128 R14: 00007f02039d6090 R15: 00007fff6b608c28
 </TASK>
