rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10441 ticks this GP) idle=062c/1/0x4000000000000000 softirq=24984/24984 fqs=3842
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   785280          0            0
rcu: 	cputime:    37247      15081           96   ==> 52330(ms)
rcu: 	(t=10500 jiffies g=17705 q=15237 ncpus=2)
CPU: 1 UID: 0 PID: 8348 Comm: syz.4.696 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_trace_consume_entry+0x0/0x280
Code: 75 0e 48 8d 65 f0 5b 41 5e 5d c3 cc cc cc cc cc e8 f5 1d cd 09 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 18 48 ba 00 00
RSP: 0018:ffffc900001dfc60 EFLAGS: 00000282
RAX: ffffffff81ac38bc RBX: ffffc900001dfd20 RCX: 5d7dd6a6fcb69a00
RDX: ffffc900001dfc01 RSI: ffffffff81ac38bc RDI: ffffc900001dfd20
RBP: ffffc900001dfcf0 R08: ffffc900001dfcf0 R09: 0000000000000000
R10: ffffc900001dfcb8 R11: ffffffff81ac3910 R12: ffff8881089f5640
R13: ffffc900001e0280 R14: ffffffff81ac3910 R15: ffffc900001dfc68
FS:  00007f97e1add6c0(0000) GS:ffff8881a3c1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557e38d39ef8 CR3: 0000000026af4000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 00000000000f0602
Call Trace:
 <IRQ>
 arch_stack_walk+0x110/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 kvfree_call_rcu+0xbb/0x410
 cfg80211_update_known_bss+0x634/0x1330
 __cfg80211_bss_update+0x147/0x2120
 cfg80211_inform_single_bss_data+0xba9/0x1ac0
 cfg80211_inform_bss_data+0x1fb/0x3b30
 cfg80211_inform_bss_frame_data+0x3d7/0x730
 ieee80211_bss_info_update+0x746/0x9e0
 ieee80211_scan_rx+0x593/0xa20
 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:_raw_spin_unlock_irqrestore+0xa8/0x110
Code: 74 05 e8 2b 67 4b f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 93 0e 14 f6 65 8b 05 6c 51 24 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc90003dcfb40 EFLAGS: 00000206
RAX: 5d7dd6a6fcb69a00 RBX: 0000000000000a02 RCX: 5d7dd6a6fcb69a00
RDX: 0000000000000007 RSI: ffffffff8d9b69f6 RDI: 0000000000000001
RBP: ffffc90003dcfbd0 R08: ffffffff8fa37e37 R09: 1ffffffff1f46fc6
R10: dffffc0000000000 R11: fffffbfff1f46fc7 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88810abd9848 R15: 1ffff920007b9f68
 __mutex_unlock_slowpath+0x65c/0x760
 __se_sys_perf_event_open+0x194c/0x1d70
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f97e0b8ebe9
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:00007f97e1add038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f97e0db5fa0 RCX: 00007f97e0b8ebe9
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000100
RBP: 00007f97e0c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f97e0db6038 R14: 00007f97e0db5fa0 R15: 00007fffd4718cf8
 </TASK>
