WARNING in cfg80211_bss_update

Status: upstream: reported C repro on 2025/12/29 19:57
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+8d9fab724d08da609d8e@syzkaller.appspotmail.com
First crash: 214d, last: 214d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2026/01/03 upstream (ToT) aacb0a6d604a C [report] WARNING in __cfg80211_bss_update
2026/07/09 upstream (ToT) 0e35b9b6ec0f C Failed due to an error; will retry later
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in cfg80211_bss_update (3) wireless -1 1 1201d 1197d 0/29 auto-obsoleted due to no activity on 2023/08/15 12:15
upstream WARNING in cfg80211_bss_update wireless -1 1 2021d 2019d 0/29 auto-closed as invalid on 2021/05/17 12:37
upstream WARNING in cfg80211_bss_update (2) wireless -1 2 1686d 1769d 0/29 auto-closed as invalid on 2022/04/18 00:39

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 88 at net/wireless/scan.c:1710 __list_del_entry include/linux/list.h:134 [inline]
WARNING: CPU: 0 PID: 88 at net/wireless/scan.c:1710 list_del include/linux/list.h:148 [inline]
WARNING: CPU: 0 PID: 88 at net/wireless/scan.c:1710 cfg80211_combine_bsses net/wireless/scan.c:1711 [inline]
WARNING: CPU: 0 PID: 88 at net/wireless/scan.c:1710 cfg80211_bss_update+0xe7c/0x1c7c net/wireless/scan.c:1907
Modules linked in:
CPU: 0 PID: 88 Comm: kworker/u4:3 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Workqueue: phy6 ieee80211_iface_work
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : cfg80211_combine_bsses include/linux/list.h:134 [inline]
pc : cfg80211_bss_update+0xe7c/0x1c7c net/wireless/scan.c:1907
lr : cfg80211_bss_update+0xc54/0x1c7c net/wireless/scan.c:-1
sp : ffff80001ce37260
x29: ffff80001ce37340 x28: 0000000000000000 x27: 0000000000000001
x26: ffff0000d8725800 x25: ffff0000deae901d x24: ffff0000d8725880
x23: ffff0000cd0c2448 x22: ffff0000d8725810 x21: ffff0000cd0c2410
x20: ffff0000cd0c2400 x19: dfff800000000000 x18: ffff800011a5bd40
x17: 1fffe00033ee7b7e x16: ffff800008042d90 x15: 0000000000000000
x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000ff0100
x11: ff00800010fc863c x10: 0000000000000000 x9 : ffff0000c62a5340
x8 : ffff0000cd0c7410 x7 : 0000000000000000 x6 : 0000000000000000
x5 : ffff0000cd0c24c8 x4 : ffff80001ce37528 x3 : ffff800010fc87ec
x2 : 0000000000000001 x1 : 0000000000000000 x0 : ffff0000d8725810
Call trace:
 __list_del_entry include/linux/list.h:134 [inline]
 list_del include/linux/list.h:148 [inline]
 cfg80211_combine_bsses net/wireless/scan.c:1711 [inline]
 cfg80211_bss_update+0xe7c/0x1c7c net/wireless/scan.c:1907
 cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2512 [inline]
 cfg80211_inform_bss_frame_data+0x884/0x10b4 net/wireless/scan.c:2545
 ieee80211_bss_info_update+0x5d0/0x9b4 net/mac80211/scan.c:190
 ieee80211_rx_bss_info net/mac80211/ibss.c:1120 [inline]
 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1609 [inline]
 ieee80211_ibss_rx_queued_mgmt+0x86c/0x2490 net/mac80211/ibss.c:1638
 ieee80211_iface_process_skb net/mac80211/iface.c:1679 [inline]
 ieee80211_iface_work+0x598/0xa34 net/mac80211/iface.c:1733
 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292
 worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
irq event stamp: 590799
hardirqs last  enabled at (590798): [<ffff8000088ccf00>] ___slab_alloc+0xcdc/0xec8 mm/slub.c:3088
hardirqs last disabled at (590799): [<ffff8000118fa220>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (590704): [<ffff800010fc7130>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (590704): [<ffff800010fc7130>] cfg80211_get_bss+0x5dc/0x850 net/wireless/scan.c:1564
softirqs last disabled at (590792): [<ffff800010fc7a68>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (590792): [<ffff800010fc7a68>] cfg80211_bss_update+0x80/0x1c7c net/wireless/scan.c:1843
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
WARNING: CPU: 0 PID: 88 at net/wireless/scan.c:1708 cfg80211_combine_bsses net/wireless/scan.c:1708 [inline]
WARNING: CPU: 0 PID: 88 at net/wireless/scan.c:1708 cfg80211_bss_update+0xe70/0x1c7c net/wireless/scan.c:1907
Modules linked in:
CPU: 0 PID: 88 Comm: kworker/u4:3 Tainted: G        W          syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Workqueue: phy6 ieee80211_iface_work
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : cfg80211_combine_bsses net/wireless/scan.c:1708 [inline]
pc : cfg80211_bss_update+0xe70/0x1c7c net/wireless/scan.c:1907
lr : cfg80211_combine_bsses net/wireless/scan.c:1708 [inline]
lr : cfg80211_bss_update+0xe70/0x1c7c net/wireless/scan.c:1907
sp : ffff80001ce37260
x29: ffff80001ce37340 x28: 0000000000000000 x27: 0000000000000002
x26: ffff0000cd0c7400 x25: ffff0000d368e01d x24: ffff0000cd0c7480
x23: ffff0000cd0c2448 x22: ffff0000cd0c7490 x21: ffff0000cd0c2410
x20: ffff0000cd0c2400 x19: dfff800000000000 x18: ffff800011a5bd40
x17: 1fffe00033ee7b7e x16: ffff800008042d90 x15: 0000000000000000
x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000ff0100
x11: ff00800010fc8858 x10: 0000000000000000 x9 : ffff800010fc8858
x8 : ffff0000c62a5340 x7 : 0000000000000000 x6 : 0000000000000000
x5 : ffff0000cd0c24c8 x4 : ffff80001ce37528 x3 : ffff800010fc87ec
x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000006
Call trace:
 cfg80211_combine_bsses net/wireless/scan.c:1708 [inline]
 cfg80211_bss_update+0xe70/0x1c7c net/wireless/scan.c:1907
 cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2512 [inline]
 cfg80211_inform_bss_frame_data+0x884/0x10b4 net/wireless/scan.c:2545
 ieee80211_bss_info_update+0x5d0/0x9b4 net/mac80211/scan.c:190
 ieee80211_rx_bss_info net/mac80211/ibss.c:1120 [inline]
 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1609 [inline]
 ieee80211_ibss_rx_queued_mgmt+0x86c/0x2490 net/mac80211/ibss.c:1638
 ieee80211_iface_process_skb net/mac80211/iface.c:1679 [inline]
 ieee80211_iface_work+0x598/0xa34 net/mac80211/iface.c:1733
 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292
 worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
irq event stamp: 590805
hardirqs last  enabled at (590804): [<ffff8000118fc2fc>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline]
hardirqs last  enabled at (590804): [<ffff8000118fc2fc>] exit_to_kernel_mode+0xcc/0xfc arch/arm64/kernel/entry-common.c:94
hardirqs last disabled at (590805): [<ffff8000118fa220>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (590704): [<ffff800010fc7130>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (590704): [<ffff800010fc7130>] cfg80211_get_bss+0x5dc/0x850 net/wireless/scan.c:1564
softirqs last disabled at (590792): [<ffff800010fc7a68>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (590792): [<ffff800010fc7a68>] cfg80211_bss_update+0x80/0x1c7c net/wireless/scan.c:1843
---[ end trace 0000000000000000 ]---

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/29 19:57 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in cfg80211_bss_update
* Struck through repros no longer work on HEAD.