rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10499 ticks this GP) idle=79f4/1/0x4000000000000000 softirq=34123/34125 fqs=4676
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   953928          6            0
rcu: 	cputime:    37626      14849           54   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=26421 q=1389 ncpus=2)
CPU: 1 UID: 0 PID: 8764 Comm: syz.2.668 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:unwind_next_frame+0x195/0x23d0
Code: 24 28 0f b6 04 28 84 c0 0f 85 4c 1b 00 00 4c 89 6c 24 48 4c 89 64 24 20 4c 89 7c 24 50 48 89 5c 24 18 0f b6 1b 48 8b 44 24 30 <80> 3c 28 00 4c 8b 7c 24 10 74 08 4c 89 ff e8 08 d9 b3 00 4d 8b 27
RSP: 0018:ffffc90000a07b18 EFLAGS: 00000246
RAX: 1ffff92000140f86 RBX: 0000000000000000 RCX: bf843e3231f1b600
RDX: 00000000c762bf3d RSI: ffffffff8bc082c0 RDI: ffffffff8bc08280
RBP: dffffc0000000000 R08: ffffffff81743f85 R09: ffffffff8df41a20
R10: ffffc90000a07c38 R11: ffffffff81ada120 R12: 1ffff92000140f7d
R13: ffffc90000a07c38 R14: ffffc90000a07be8 R15: ffffffff81743f85
FS:  00007f44b0ba06c0(0000) GS:ffff8882a9e35000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000051000 CR3: 000000011cba8000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 kvfree_call_rcu+0x11b/0x480
 cfg80211_update_known_bss+0x830/0x1590
 __cfg80211_bss_update+0x147/0x2110
 cfg80211_inform_single_bss_data+0xbc8/0x1ad0
 cfg80211_inform_bss_data+0x203/0x3b40
 cfg80211_inform_bss_frame_data+0x3c7/0x710
 ieee80211_bss_info_update+0x749/0x9e0
 ieee80211_scan_rx+0x593/0xa20
 ieee80211_rx_list+0x2485/0x2f90
 ieee80211_rx_napi+0x1a8/0x3d0
 ieee80211_handle_queued_frames+0xe8/0x1e0
 tasklet_action_common+0x358/0x550
 handle_softirqs+0x27d/0x850
 __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:__schedule+0x19b/0x5000
Code: f6 48 8b 1b 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 8c 7a cb f6 48 81 3b 9d 6e ac 57 <0f> 85 5b 19 00 00 45 85 ed 7f 54 49 8d 5e 18 48 89 d8 48 c1 e8 03
RSP: 0018:ffffc90003ba77a0 EFLAGS: 00000246
RAX: 1ffff92000774000 RBX: ffffc90003ba0000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff8bc082c0 RDI: ffffffff8bc08280
RBP: ffffc90003ba79b0 R08: ffffffff8f821f77 R09: 1ffffffff1f043ee
R10: dffffc0000000000 R11: fffffbfff1f043ef R12: ffff8882a9e35000
R13: 0000000000000001 R14: ffff888105398000 R15: 1ffff110478c7680
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x5d8/0x660
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:rep_movs_alternative+0x75/0x90
Code: 05 e9 8f 48 04 00 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 29 f8 48 01 c7 48 01 c6 48 29 c1 48 89 c8 48 c1 e9 03 83 e0 07 <f3> 48 a5 89 c1 85 c9 75 91 c3 cc cc cc cc 48 8d 0c c8 eb 86 cc cc
RSP: 0018:ffffc90003ba7b78 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 000000000000ffd0 RCX: 0000000000001e32
RDX: 0000000000000001 RSI: 00002000000512d0 RDI: ffff888119830e40
RBP: ffffc90003ba7cc0 R08: ffff88811983ffcf R09: 1ffff11023307ff9
R10: dffffc0000000000 R11: ffffed1023307ffa R12: ffffc90003ba7d88
R13: 1ffff92000774fb1 R14: ffff888119830000 R15: 0000200000050490
 _copy_from_user+0x7a/0xb0
 generic_map_update_batch+0x566/0x810
 bpf_map_do_batch+0x39b/0x630
 __sys_bpf+0x750/0x8a0
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f44afd8f7c9
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:00007f44b0ba0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f44affe5fa0 RCX: 00007f44afd8f7c9
RDX: 0000000000000038 RSI: 0000200000000200 RDI: 000000000000001a
RBP: 00007f44afdf297f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f44affe6038 R14: 00007f44affe5fa0 R15: 00007ffc6b731e28
 </TASK>
