rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10438 ticks this GP) idle=4dfc/1/0x4000000000000000 softirq=21604/22148 fqs=5220
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1260914       1287            0
rcu: 	cputime:    30864      21620           40   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=13553 q=2027 ncpus=2)
CPU: 1 UID: 0 PID: 7470 Comm: syz.4.447 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:ieee80211_rx_list+0x12b1/0x2a90
Code: 20 48 8b 7c 24 18 e8 1e 02 6e fe 49 bc 00 00 00 00 00 fc ff df 48 8b 9c 24 98 00 00 00 48 85 db 74 1c e8 62 e6 ca f6 48 89 df <48> 8b 74 24 58 48 8b 54 24 30 e8 a0 a0 00 00 49 89 c5 eb 08 e8 46
RSP: 0018:ffffc900001e0a00 EFLAGS: 00000246
RAX: ffffffff8af4c478 RBX: 0000000000000000 RCX: ffff888116619cc0
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff888111c3f680
RBP: ffffc900001e0c10 R08: ffff888110b18e9f R09: 1ffff110221631d3
R10: dffffc0000000000 R11: ffffed10221631d4 R12: dffffc0000000000
R13: ffff888111c3f680 R14: ffff888110b18e40 R15: 0000000000000001
FS:  00007fc4362386c0(0000) GS:ffff8881a3c1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000d000 CR3: 000000012fc32000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 ieee80211_rx_napi+0x1a8/0x3d0
 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:rcu_read_unlock_special+0x87/0x5e0
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 b2 27 f9 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc90004aff660 EFLAGS: 00000206
RAX: 81fbf9d93edb3700 RBX: 1ffff9200095fed4 RCX: 81fbf9d93edb3700
RDX: 0000000000000006 RSI: ffffffff8d9b6ac3 RDI: ffffffff8be33300
RBP: ffffc90004aff760 R08: ffffffff8fa38037 R09: 1ffffffff1f47006
R10: dffffc0000000000 R11: fffffbfff1f47007 R12: ffffffff8e13f200
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002
 __rcu_read_unlock+0x84/0xe0
 refill_obj_stock+0x247/0x850
 __memcg_slab_free_hook+0x127/0x3d0
 kmem_cache_free+0x223/0x400
 finish_task_switch+0x3ee/0x950
 __schedule+0x17a0/0x4cc0
 preempt_schedule_common+0x83/0xd0
 preempt_schedule+0xae/0xc0
 preempt_schedule_thunk+0x16/0x30
 _raw_spin_unlock_irq+0x45/0x50
 get_signal+0x103e/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc43538ebe9
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:00007fc4362380e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 00007fc4355c5fa8 RCX: 00007fc43538ebe9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fc4355c5fac
RBP: 00007fc4355c5fa0 R08: 7fffffffffffffff R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc4355c6038 R14: 00007ffcee444ce0 R15: 00007ffcee444dc8
 </TASK>
sched: DL replenish lagged too much
