WARNING in __cfg80211_bss_update

Status: upstream: reported on 2026/09/22 14:14
Reported-by: syzbot+54e26d5dbfae10fd7f9a@syzkaller.appspotmail.com
First crash: 15d, last: 15d
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in __cfg80211_bss_update (2) prio:high wireless -1 syz, C inconclusive 130 13d 821d 26/29 upstream: reported C repro on 2024/07/09 00:36
upstream WARNING in __cfg80211_bss_update wireless -1 1 1049d 1045d 0/29 auto-obsoleted due to no activity on 2024/03/02 19:52

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 3482 at net/wireless/scan.c:521 cfg80211_bss_expire_oldest net/wireless/scan.c:521 [inline]
WARNING: CPU: 0 PID: 3482 at net/wireless/scan.c:521 __cfg80211_bss_update+0x219b/0x21b0 net/wireless/scan.c:1933
Modules linked in:
CPU: 0 PID: 3482 Comm: kworker/u4:12 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:521 [inline]
RIP: 0010:__cfg80211_bss_update+0x219b/0x21b0 net/wireless/scan.c:1933
Code: c7 c1 2c 66 8c 8e 80 e1 07 80 c1 03 38 c1 0f 8c 55 fc ff ff 48 c7 c7 2c 66 8c 8e e8 bf f2 f9 f7 e9 44 fc ff ff e8 b5 66 a1 f7 <0f> 0b 4c 8b 2c 24 e9 95 fc ff ff 66 2e 0f 1f 84 00 00 00 00 00 f3
RSP: 0018:ffffc9000cb77318 EFLAGS: 00010293

RAX: ffffffff89e6249b RBX: ffff88802c73dc00 RCX: ffff88802dd05a00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffff888030379453 R09: 1ffff1100606f28a
R10: dffffc0000000000 R11: ffffed100606f28b R12: ffff88807be60190
R13: ffff88807be60190 R14: 0000000000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0c25feb840 CR3: 0000000079ba8000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2985 [inline]
 cfg80211_inform_bss_frame_data+0xadb/0x1330 net/wireless/scan.c:3016
 ieee80211_bss_info_update+0x789/0x9f0 net/mac80211/scan.c:211
 ieee80211_rx_bss_info net/mac80211/ibss.c:1124 [inline]
 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1613 [inline]
 ieee80211_ibss_rx_queued_mgmt+0x18f5/0x2dc0 net/mac80211/ibss.c:1642
 ieee80211_iface_process_skb net/mac80211/iface.c:1661 [inline]
 ieee80211_iface_work+0x730/0xc90 net/mac80211/iface.c:1715
 cfg80211_wiphy_work+0x228/0x260 net/wireless/core.c:437
 process_one_work kernel/workqueue.c:2657 [inline]
 process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734
 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/22 14:29 linux-6.6.y 79643295eba1 e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __cfg80211_bss_update
2026/09/22 14:27 linux-6.6.y 79643295eba1 e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __cfg80211_bss_update
2026/09/22 14:26 linux-6.6.y 79643295eba1 e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __cfg80211_bss_update
2026/09/22 14:17 linux-6.6.y 79643295eba1 e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __cfg80211_bss_update
2026/09/22 14:16 linux-6.6.y 79643295eba1 e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __cfg80211_bss_update
2026/09/22 14:15 linux-6.6.y 79643295eba1 e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __cfg80211_bss_update
2026/09/22 14:14 linux-6.6.y 79643295eba1 e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __cfg80211_bss_update
2026/09/22 14:13 linux-6.6.y 79643295eba1 e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __cfg80211_bss_update
* Struck through repros no longer work on HEAD.