rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10420 ticks this GP) idle=860c/1/0x4000000000000000 softirq=55223/55224 fqs=4432
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   964421          0            0
rcu: 	cputime:    35753      16736           50   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=41109 q=3956 ncpus=2)
CPU: 1 UID: 0 PID: 14171 Comm: syz.8.3267 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:stack_depot_save_flags+0x156/0x810
Code: c8 31 c5 c1 c0 18 29 c5 48 8b 05 e5 a9 3d 15 8b 0d d7 a9 3d 15 21 e9 48 c1 e1 04 4c 8d 24 08 65 ff 05 2e c5 fd 0d 4c 8b 3c 08 <4d> 39 e7 44 89 2c 24 74 05 45 89 d5 eb 34 45 31 ff e9 85 00 00 00
RSP: 0018:ffffc90000a07e78 EFLAGS: 00000206
RAX: ffff88823b400000 RBX: 0000000000000000 RCX: 0000000000e79140
RDX: 000000006746034d RSI: 0000000000000000 RDI: 00000000688434f0
RBP: 00000000c73e7914 R08: 00000000ac441785 R09: 000000006f4c6ed7
R10: 0000000000000013 R11: ffffffff81ae5bd0 R12: ffff88823c279140
R13: 0000000000000000 R14: ffffc90000a07ed0 R15: ffff8881a009a300
FS:  00007f00105376c0(0000) GS:ffff8882a9928000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555859e14e8 CR3: 0000000104ee0000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 kasan_save_stack+0x4d/0x60
 kasan_record_aux_stack+0xbd/0xd0
 kvfree_call_rcu+0x106/0x440
 cfg80211_update_known_bss+0x830/0x1590
 __cfg80211_bss_update+0x147/0x2110
 cfg80211_inform_single_bss_data+0xbc4/0x1ab0
 cfg80211_inform_bss_data+0x233/0x3bb0
 cfg80211_inform_bss_frame_data+0x3c7/0x710
 ieee80211_bss_info_update+0x794/0xa40
 ieee80211_scan_rx+0x593/0xa20
 ieee80211_rx_list+0x2508/0x3050
 ieee80211_rx_napi+0x1b1/0x3e0
 ieee80211_handle_queued_frames+0xe8/0x1e0
 tasklet_action_common+0x2da/0x4b0
 handle_softirqs+0x22a/0x7c0
 __irq_exit_rcu+0x5f/0x150
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:finish_task_switch+0x241/0x920
Code: 0f 84 bd 01 00 00 48 85 db 0f 85 e4 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 29 82 e8 09 e8 64 84 37 00 fb 4c 8b 65 c0 <49> 8d bc 24 48 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc90005e8f978 EFLAGS: 00000206
RAX: 0000000000033235 RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000000000000006 RSI: ffffffff8dad37f0 RDI: ffffffff8be74080
RBP: ffffc90005e8f9d0 R08: ffffffff8fced877 R09: 1ffffffff1f9db0e
R10: dffffc0000000000 R11: fffffbfff1f9db0f R12: ffff88810a313a80
R13: dffffc0000000000 R14: ffff888102ab1d40 R15: ffff88823c63b498
 __schedule+0x14f7/0x4fb0
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x597/0x620
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:__se_sys_perf_event_open+0x192f/0x1d60
Code: 00 00 00 fc ff df 0f b6 04 08 84 c0 0f 85 22 03 00 00 48 8b 74 24 18 8b 96 14 03 00 00 4c 8b 7c 24 30 4c 89 ff e8 11 4a 00 00 <4c> 89 ff e8 d9 17 ff ff 48 8b 7c 24 68 e8 8f 20 85 09 80 7c 24 38
RSP: 0018:ffffc90005e8fd00 EFLAGS: 00000246
RAX: f3dbea86b1351400 RBX: ffff88810a313a80 RCX: 0000000000080000
RDX: ffffc90021877000 RSI: 0000000000000633 RDI: 0000000000000634
RBP: ffffc90005e8fee0 R08: ffffffff8fced877 R09: 1ffffffff1f9db0e
R10: dffffc0000000000 R11: fffffbfff1f9db0f R12: 1ffff92000bd1fb0
R13: ffff88810b388648 R14: ffff88810b388890 R15: ffff888113517000
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f000f59acb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0010537028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f000f815fa0 RCX: 00007f000f59acb9
RDX: affffff7ffffffff RSI: 0000000000000000 RDI: 0000200000000180
RBP: 00007f000f608bf7 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f000f816038 R14: 00007f000f815fa0 R15: 00007fff916fa268
 </TASK>
sched: DL replenish lagged too much
