rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10498 ticks this GP) idle=b6ec/1/0x4000000000000000 softirq=33415/33686 fqs=4987
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   913351        863            0
rcu: 	cputime:    33486      18999           63   ==> 52500(ms)
rcu: 	(t=10503 jiffies g=20569 q=4609 ncpus=2)
CPU: 0 UID: 0 PID: 8098 Comm: syz.5.569 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_scan_rx+0x24e/0xa20
Code: d4 f6 48 bb 00 00 00 00 00 fc ff df 4c 8d 6d 40 4c 89 e8 48 c1 e8 03 48 89 44 24 28 80 3c 18 00 74 08 4c 89 ef e8 c2 a5 37 f7 <4c> 89 6c 24 30 49 8b 6d 00 4d 8d 6e 44 4c 89 e8 48 c1 e8 03 0f b6
RSP: 0018:ffffc90000007990 EFLAGS: 00000246
RAX: 1ffff110064a01d0 RBX: dffffc0000000000 RCX: ffff888021afb980
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffff888032500e40 R08: ffff888032502977 R09: 1ffff110064a052e
R10: dffffc0000000000 R11: ffffed10064a052f R12: 1ffff11006018d2e
R13: ffff888032500e80 R14: ffff8880300c6900 R15: 1ffff11008f002aa
FS:  00007f7cf4bae6c0(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbc4fb056c0 CR3: 00000000295b0000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000602
Call Trace:
 <IRQ>
 ieee80211_rx_list+0x201c/0x2a90
 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+0x87/0x4b0
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 82 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:ffffc900046af140 EFLAGS: 00000206
RAX: bbf86d0b7984a700 RBX: 1ffff920008d5e2c RCX: bbf86d0b7984a700
RDX: 0000000000000006 RSI: ffffffff8d9ba18b RDI: ffffffff8be33e00
RBP: ffffc900046af218 R08: ffffffff8fa3a837 R09: 1ffffffff1f47506
R10: dffffc0000000000 R11: fffffbfff1f47507 R12: ffffffff8e13f400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x84/0xe0
 unwind_next_frame+0x19ae/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kmem_cache_free+0x18f/0x400
 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: 0033:0x7f7cf3d8eba9
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:00007f7cf4bae038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f7cf3fd5fa0 RCX: 00007f7cf3d8eba9
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000100
RBP: 00007f7cf3e11e19 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7cf3fd6038 R14: 00007f7cf3fd5fa0 R15: 00007ffd575e0b88
 </TASK>
sched: DL replenish lagged too much
