netdev - Re: [syzbot] [wireless?] WARNING in ieee80211_tx_h_rate

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Message-ID: <6988da38.050a0220.1ad825.0005.GAE@google.com>
Date: Sun, 08 Feb 2026 10:47:20 -0800
From: syzbot <syzbot+0d516b33238bd97ee864@...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 ieee80211_tx_h_rate_ctrl

syzbot has found a reproducer for the following issue on:

HEAD commit:    6d2f142b1e4b net: hns3: fix double free issue for tx spare..
git tree:       net
console output: https://syzkaller.appspot.com/x/log.txt?x=13ade7fa580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e3161cabe5a361ff
dashboard link: https://syzkaller.appspot.com/bug?extid=0d516b33238bd97ee864
compiler:       Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=178a965a580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=141bb65a580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/efb336297393/disk-6d2f142b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c21fa89166f7/vmlinux-6d2f142b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9404edc5fcc0/bzImage-6d2f142b.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0d516b33238bd97ee864@...kaller.appspotmail.com

------------[ cut here ]------------
wlan1: Dropped data frame as no usable bitrate found while scanning and associated. Target station: 08:02:11:00:00:00 on 5 GHz band
WARNING: net/mac80211/tx.c:758 at ieee80211_tx_h_rate_ctrl+0xd82/0x1760 net/mac80211/tx.c:751, CPU#1: kworker/u8:8/3000
Modules linked in:
CPU: 1 UID: 0 PID: 3000 Comm: kworker/u8:8 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:ieee80211_tx_h_rate_ctrl+0xded/0x1760 net/mac80211/tx.c:751
Code: 1c 08 00 00 48 8b 44 24 38 8b 30 45 31 ed 83 e6 07 41 0f 95 c5 31 ff e8 01 3c b2 f6 43 8d 4c 6d 02 48 89 df 4c 89 f6 4c 89 fa <67> 48 0f b9 3a 41 bd 01 00 00 00 e9 73 01 00 00 e8 9e 37 b2 f6 e9
RSP: 0018:ffffc9000b7173c0 EFLAGS: 00010293
RAX: ffffffff8b123f8f RBX: ffffffff900054b0 RCX: 0000000000000005
RDX: ffff88805e97c384 RSI: ffff8880783817c8 RDI: ffffffff900054b0
RBP: ffffc9000b717528 R08: ffff88807cad29c7 R09: 1ffff1100f95a538
R10: dffffc0000000000 R11: ffffed100f95a539 R12: dffffc0000000000
R13: 0000000000000001 R14: ffff8880783817c8 R15: ffff88805e97c384
FS:  0000000000000000(0000) GS:ffff8881257f5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdf034708c0 CR3: 0000000079e3a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 invoke_tx_handlers_late+0xba/0x18a0 net/mac80211/tx.c:1849
 ieee80211_tx+0x2d7/0x4b0 net/mac80211/tx.c:1971
 __ieee80211_tx_skb_tid_band+0x50f/0x680 net/mac80211/tx.c:6288
 ieee80211_tx_skb_tid_band net/mac80211/ieee80211_i.h:2405 [inline]
 ieee80211_send_scan_probe_req net/mac80211/scan.c:685 [inline]
 ieee80211_scan_state_send_probe+0x594/0xa00 net/mac80211/scan.c:713
 ieee80211_scan_work+0x65f/0x1c50 net/mac80211/scan.c:1174
 cfg80211_wiphy_work+0x2ab/0x450 net/wireless/core.c:438
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340
 worker_thread+0xda6/0x1360 kernel/workqueue.c:3421
 kthread+0x726/0x8b0 kernel/kthread.c:463
 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
----------------
Code disassembly (best guess):
   0:	1c 08                	sbb    $0x8,%al
   2:	00 00                	add    %al,(%rax)
   4:	48 8b 44 24 38       	mov    0x38(%rsp),%rax
   9:	8b 30                	mov    (%rax),%esi
   b:	45 31 ed             	xor    %r13d,%r13d
   e:	83 e6 07             	and    $0x7,%esi
  11:	41 0f 95 c5          	setne  %r13b
  15:	31 ff                	xor    %edi,%edi
  17:	e8 01 3c b2 f6       	call   0xf6b23c1d
  1c:	43 8d 4c 6d 02       	lea    0x2(%r13,%r13,2),%ecx
  21:	48 89 df             	mov    %rbx,%rdi
  24:	4c 89 f6             	mov    %r14,%rsi
  27:	4c 89 fa             	mov    %r15,%rdx
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	41 bd 01 00 00 00    	mov    $0x1,%r13d
  35:	e9 73 01 00 00       	jmp    0x1ad
  3a:	e8 9e 37 b2 f6       	call   0xf6b237dd
  3f:	e9                   	.byte 0xe9


---
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.