------------[ cut here ]------------
!oldest
WARNING: net/wireless/scan.c:513 at cfg80211_bss_expire_oldest net/wireless/scan.c:513 [inline], CPU#1: ksoftirqd/1/29
WARNING: net/wireless/scan.c:513 at __cfg80211_bss_update+0x19d8/0x2450 net/wireless/scan.c:2115, CPU#1: ksoftirqd/1/29
Modules linked in:
CPU: 1 UID: 0 PID: 29 Comm: ksoftirqd/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:cfg80211_bss_expire_oldest net/wireless/scan.c:513 [inline]
RIP: 0010:__cfg80211_bss_update+0x19d8/0x2450 net/wireless/scan.c:2115
Code: 00 31 ff 41 89 c5 89 c6 e8 85 4d ea f6 45 85 ed 0f 85 65 f9 ff ff e8 07 53 ea f6 90 0f 0b 90 e9 57 f9 ff ff e8 f9 52 ea f6 90 <0f> 0b 90 e9 fc fa ff ff e8 eb 52 ea f6 48 8b 44 24 08 48 8d 88 ac
RSP: 0018:ffffc90000687168 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff92459a04 RCX: 0000000000000301
RDX: ffff888020a9a580 RSI: ffffffff8b220397 RDI: ffff888020a9a580
RBP: ffff888027580088 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888027580000
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88803f300190
FS:  0000000000000000(0000) GS:ffff8880d4a46000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005587f1241000 CR3: 000000003594a000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 cfg80211_inform_single_bss_data+0x770/0x1dc0 net/wireless/scan.c:2442
 cfg80211_inform_bss_data+0x230/0x3c20 net/wireless/scan.c:3302
 cfg80211_inform_bss_frame_data+0x245/0x7c0 net/wireless/scan.c:3394
 ieee80211_bss_info_update+0x310/0xab0 net/mac80211/scan.c:230
 ieee80211_scan_rx+0x4e6/0xb60 net/mac80211/scan.c:364
 __ieee80211_rx_handle_packet+0xbab/0xfc0 net/mac80211/rx.c:5433
 ieee80211_rx_list+0xf19/0x2160 net/mac80211/rx.c:5726
 ieee80211_rx_napi+0xdc/0x400 net/mac80211/rx.c:5749
 ieee80211_rx include/net/mac80211.h:5449 [inline]
 ieee80211_handle_queued_frames+0xc8/0x120 net/mac80211/main.c:452
 tasklet_action_common+0x2de/0x3d0 kernel/softirq.c:961
 handle_softirqs+0x1e6/0x9d0 kernel/softirq.c:645
 run_ksoftirqd kernel/softirq.c:1099 [inline]
 run_ksoftirqd+0x38/0x60 kernel/softirq.c:1091
 smpboot_thread_fn+0x3d3/0xab0 kernel/smpboot.c:160
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>