netdev - Re: [syzbot] [wireless?] WARNING in cfg80211_rehash

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Message-ID: <68c925c8.050a0220.50883.0019.GAE@google.com>
Date: Tue, 16 Sep 2025 01:54:32 -0700
From: syzbot <syzbot+dc6f4dce0d707900cdea@...kaller.appspotmail.com>
To: johannes@...solutions.net, linux-kernel@...r.kernel.org, 
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [wireless?] WARNING in cfg80211_rehash_bss

syzbot has found a reproducer for the following issue on:

HEAD commit:    46a51f4f5eda Merge tag 'for-v6.17-rc' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17077b12580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=bf99f2510ef92ba5
dashboard link: https://syzkaller.appspot.com/bug?extid=dc6f4dce0d707900cdea
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=148db47c580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17fd7762580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-46a51f4f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ccc826c963ac/vmlinux-46a51f4f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/79f8a247dcf5/bzImage-46a51f4f.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+dc6f4dce0d707900cdea@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 43 at net/wireless/scan.c:1666 rb_insert_bss net/wireless/scan.c:1666 [inline]
WARNING: CPU: 0 PID: 43 at net/wireless/scan.c:1666 cfg80211_rehash_bss+0x1e6/0x540 net/wireless/scan.c:1723
Modules linked in:
CPU: 0 UID: 0 PID: 43 Comm: kworker/u4:3 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:rb_insert_bss net/wireless/scan.c:1666 [inline]
RIP: 0010:cfg80211_rehash_bss+0x1e6/0x540 net/wireless/scan.c:1723
Code: e8 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 33 03 00 00 ff 45 00 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d e9 0c 3d af 00 cc 90 <0f> 0b 90 4c 8b 2c 24 4c 89 ef e8 7b 4c 02 fa 84 c0 74 78 e8 e2 dd
RSP: 0018:ffffc900005e6f20 EFLAGS: 00010246
RAX: ffffffff8acfee15 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88801f0c8000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8880113f6c68 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000002 R11: 0000000000000000 R12: ffff888043c281a0
R13: ffff88801a485430 R14: dffffc0000000000 R15: ffff88801a484c20
FS:  0000000000000000(0000) GS:ffff88808d00a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c009610000 CR3: 0000000011e4c000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 cfg80211_update_assoc_bss_entry+0x3f6/0x6a0 net/wireless/scan.c:3471
 cfg80211_ch_switch_notify+0x3c1/0x780 net/wireless/nl80211.c:20399
 ieee80211_sta_process_chanswitch+0xad4/0x2870 net/mac80211/mlme.c:-1
 ieee80211_rx_mgmt_beacon+0x19c7/0x2cd0 net/mac80211/mlme.c:7523
 ieee80211_sta_rx_queued_mgmt+0x4ed/0x4470 net/mac80211/mlme.c:8093
 ieee80211_iface_process_skb net/mac80211/iface.c:1696 [inline]
 ieee80211_iface_work+0x652/0x12d0 net/mac80211/iface.c:1753
 cfg80211_wiphy_work+0x2b8/0x470 net/wireless/core.c:435
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.