[v5.15] WARNING in cfg80211_bss_update

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 0248c33e835e Linux 5.15.221
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=100b1805580000
kernel config: https://syzkaller.appspot.com/x/.config?x=21845b39f8fc6be8
dashboard link: https://syzkaller.appspot.com/bug?extid=e637ed85a59747cf2b5c
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/cdcbd8738a16/disk-0248c33e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/864175e96c3d/vmlinux-0248c33e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/cb031d3f4011/bzImage-0248c33e.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e637ed...@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 4238 at net/wireless/scan.c:520 cfg80211_bss_expire_oldest net/wireless/scan.c:520 [inline]
WARNING: CPU: 0 PID: 4238 at net/wireless/scan.c:520 cfg80211_bss_update+0x2196/0x21a0 net/wireless/scan.c:1891
Modules linked in:

CPU: 0 PID: 4238 Comm: kworker/u4:5 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events_unbound cfg80211_wiphy_work

RIP: 0010:cfg80211_bss_expire_oldest net/wireless/scan.c:520 [inline]
RIP: 0010:cfg80211_bss_update+0x2196/0x21a0 net/wireless/scan.c:1891
Code: c7 c1 84 52 8b 8d 80 e1 07 80 c1 03 38 c1 0f 8c 5c fc ff ff 48 c7 c7 84 52 8b 8d e8 44 fa 8d f8 e9 4b fc ff ff e8 8a c6 48 f8 <0f> 0b e9 a0 fc ff ff 0f 1f 00 55 41 57 41 56 41 55 41 54 53 48 83
RSP: 0018:ffffc900031ff450 EFLAGS: 00010293

RAX: ffffffff89304e16 RBX: ffff888077710190 RCX: ffff8880211e0000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffff88805f546453 R09: 1ffff1100bea8c8a
R10: dffffc0000000000 R11: ffffed100bea8c8b R12: 0000000000000001
R13: ffff888077710190 R14: ffff888027ceb800 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f15280ed000 CR3: 000000001fe7a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2552 [inline]
cfg80211_inform_bss_frame_data+0x88d/0x1ed0 net/wireless/scan.c:2585
ieee80211_bss_info_update+0x6ba/0xa80 net/mac80211/scan.c:190
ieee80211_rx_bss_info net/mac80211/ibss.c:1123 [inline]
ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1614 [inline]
ieee80211_ibss_rx_queued_mgmt+0x1763/0x2b50 net/mac80211/ibss.c:1643
ieee80211_iface_process_skb net/mac80211/iface.c:1465 [inline]
ieee80211_iface_work+0x714/0xc50 net/mac80211/iface.c:1519
cfg80211_wiphy_work+0x224/0x260 net/wireless/core.c:433
process_one_work+0x867/0xff0 kernel/workqueue.c:2310
worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup