rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10464 ticks this GP) idle=88dc/1/0x4000000000000000 softirq=20214/20225 fqs=431
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1015181         25            0
rcu: 	cputime:    29324      21927           49   ==> 51260(ms)
rcu: 	(t=10500 jiffies g=12717 q=1242 ncpus=2)
CPU: 0 UID: 0 PID: 6673 Comm: syz.4.197 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:deref_stack_reg+0x33/0x230
Code: 53 48 83 ec 20 48 89 54 24 18 49 89 f0 49 89 ff 48 be 00 00 00 00 00 fc ff df 48 8d 5f 08 49 89 dc 49 c1 ec 03 41 80 3c 34 00 <4c> 89 04 24 74 16 48 89 df e8 ff 69 b2 00 4c 8b 04 24 48 be 00 00
RSP: 0018:ffffc90000006b00 EFLAGS: 00000246
RAX: fffffffffffffff0 RBX: ffffc90000006c30 RCX: 0000000000000000
RDX: ffffc90000006c68 RSI: dffffc0000000000 RDI: ffffc90000006c28
RBP: dffffc0000000000 R08: ffffc900000079f0 R09: 0000000000000000
R10: ffffc90000006c78 R11: fffff52000000d91 R12: 1ffff92000000d86
R13: ffffc90000006c78 R14: ffffc90000006c28 R15: ffffc90000006c28
FS:  00007fba4d7f66c0(0000) GS:ffff88818eb38000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000172b34000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0x17c4/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 kvfree_call_rcu+0x130/0x4c0
 cfg80211_update_known_bss+0x830/0x1590
 __cfg80211_bss_update+0x147/0x2120
 cfg80211_inform_single_bss_data+0xba9/0x1ac0
 cfg80211_inform_bss_data+0x203/0x3b40
 cfg80211_inform_bss_frame_data+0x3d7/0x730
 ieee80211_bss_info_update+0x749/0x9e0
 ieee80211_scan_rx+0x593/0xa20
 ieee80211_rx_list+0x2192/0x2c10
 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:generic_exec_single+0x481/0x500
Code: 75 11 e8 d2 7f 0b 00 48 85 db 75 16 e8 c8 7f 0b 00 eb 15 e8 c1 7f 0b 00 e8 ec 5a 92 09 48 85 db 74 ea e8 b2 7f 0b 00 fb 31 c0 <48> c7 44 24 20 0e 36 e0 45 4b c7 04 2c 00 00 00 00 66 43 c7 44 2c
RSP: 0018:ffffc90003a279c0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000080000
RDX: ffffc9002ca08000 RSI: 000000000000033d RDI: 000000000000033e
RBP: ffffc90003a27a90 R08: ffffffff8f7cee77 R09: 1ffffffff1ef9dce
R10: dffffc0000000000 R11: fffffbfff1ef9dcf R12: 1ffff92000744f3c
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff92000744f5d
 smp_call_function_single+0x351/0x590
 perf_install_in_context+0x593/0x8f0
 __se_sys_perf_event_open+0x193a/0x1d70
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fba4f58f749
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:00007fba4d7f6038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007fba4f7e5fa0 RCX: 00007fba4f58f749
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000480
RBP: 00007fba4f613f91 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fba4f7e6038 R14: 00007fba4f7e5fa0 R15: 00007ffd0cf35c08
 </TASK>
