linux-kernel - Re: [syzbot] [wireless?] WARNING in mac80211_hwsim_sta_rc

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Message-ID: <686812fd.a00a0220.c7b3.0020.GAE@google.com>
Date: Fri, 04 Jul 2025 10:44:29 -0700
From: syzbot <syzbot+c0472dd80bb8f668625f@...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 mac80211_hwsim_sta_rc_update

syzbot has found a reproducer for the following issue on:

HEAD commit:    4c06e63b9203 Merge tag 'for-6.16-rc4-tag' of git://git.ker..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16f94582580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b29b1a0d7330d4a8
dashboard link: https://syzkaller.appspot.com/bug?extid=c0472dd80bb8f668625f
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13f66c8c580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12497ebc580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-4c06e63b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ff61efc838cb/vmlinux-4c06e63b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/dea44d0d14bb/bzImage-4c06e63b.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c0472dd80bb8f668625f@...kaller.appspotmail.com

------------[ cut here ]------------
intf 08:02:11:00:00:01 [link=0]: bad STA 00:00:00:ff:ff:ff bandwidth 20 MHz (0) > channel config 10 MHz (7)
WARNING: CPU: 0 PID: 176 at drivers/net/wireless/virtual/mac80211_hwsim.c:2653 mac80211_hwsim_sta_rc_update+0x6f5/0x860 drivers/net/wireless/virtual/mac80211_hwsim.c:2650
Modules linked in:
CPU: 0 UID: 0 PID: 176 Comm: kworker/u4:4 Not tainted 6.16.0-rc4-syzkaller-00123-g4c06e63b9203 #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:mac80211_hwsim_sta_rc_update+0x6f5/0x860 drivers/net/wireless/virtual/mac80211_hwsim.c:2650
Code: 71 17 00 00 48 c7 c7 c0 ae 2d 8c 48 8b 74 24 28 89 ea 48 8b 4c 24 10 41 89 d8 45 89 f9 41 56 50 e8 d0 df 8f fa 48 83 c4 10 90 <0f> 0b 90 90 e9 0c ff ff ff e8 2d 37 cc fa 90 0f 0b 90 e9 fe fe ff
RSP: 0018:ffffc90001a07768 EFLAGS: 00010282
RAX: 2b7aa56dabf85f00 RBX: 0000000000000014 RCX: ffff888000b5a440
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 0000000000000000 R08: ffff88801fc24293 R09: 1ffff11003f84852
R10: dffffc0000000000 R11: ffffed1003f84853 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000007 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88808d21c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffec31d80b8 CR3: 000000001216d000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 mac80211_hwsim_sta_add+0xa3/0x310 drivers/net/wireless/virtual/mac80211_hwsim.c:2670
 drv_sta_add net/mac80211/driver-ops.h:466 [inline]
 drv_sta_state+0x8be/0x1840 net/mac80211/driver-ops.c:155
 sta_info_insert_drv_state net/mac80211/sta_info.c:775 [inline]
 sta_info_insert_finish net/mac80211/sta_info.c:883 [inline]
 sta_info_insert_rcu+0xd32/0x1940 net/mac80211/sta_info.c:960
 ieee80211_ocb_finish_sta net/mac80211/ocb.c:102 [inline]
 ieee80211_ocb_work+0x31f/0x580 net/mac80211/ocb.c:136
 cfg80211_wiphy_work+0x2df/0x460 net/wireless/core.c:435
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 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.