From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f71.google.com (mail-oo1-f71.google.com [209.85.161.71]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2898B32ED3C for ; Tue, 17 Feb 2026 11:01:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.71 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771326101; cv=none; b=Lm8SIMHpBUPfm8W9ZOjiZsLizu+POtdjyzApbhQefMbce+2W3tQtgYZV3IFuch42DIPG3hrh1DYa6zs77B6GrnS8sv8FyKUxGSUnLaRBjHMEnzQcdCHoeZmzG7Ntkt1/7+FZqdGqZ9FLIw+Vpk43QJywUWtEuwO6qTz/b8Cx3hE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771326101; c=relaxed/simple; bh=f9Sn65bMDeQFADkZz2X3ALt7rkOgQHXefFnV6ZTP2iU=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=rwomy34UXPKISVEvanewO2DfpV+7dNG6XpSCvXNVTzcdHc+kAih4f1ZyCfHWS7w8g5jGbv/RJLdiWBbzz48eM0kG6KPVdvlW8M/efyTO+bxwWVdeAtNi+CYfO/27eWvleFGoKfzgDJFbxMMdJAGzP+Kfyue4TlVVXbwVjKmBdi8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.161.71 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oo1-f71.google.com with SMTP id 006d021491bc7-676de68a609so16349404eaf.0 for ; Tue, 17 Feb 2026 03:01:37 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1771326097; x=1771930897; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=49KmW+xMN4yjOJq5KWsrgNTbzky5ua/zIOKn1y7eBTg=; b=G4/XfQHeu8x8/uxu7Z24cqaWGNXWJIqVa9a+pJCXlhC2F8teKNKElGyn//FK2GbKxz g0TiAESOARN5rEwF3p07D0qaDX28Zpu4yPJv8WDSJbrme3LNsr4fEJFdCC+d6KipLNEt pXUznyK65EI1w6lixYVY5HsjsTdNjocxdYM0XUTF3gA0U5EETC6hGagFZolRs9oxRVDy cgEUe+bkGzCRPy2rtKsM+KuN8oXBHGhkdrV6QjZVy7iPfvTpcc01QXHpa6FA5NRibnvW QZyjxA7lR5dqNHlIGMuIicKnrqKc1YT89za11s1hFU9IzqlwF24/FhHu5CkbGRvaxT18 y7ow== X-Forwarded-Encrypted: i=1; AJvYcCUr59ZQI4cwfn0wO2ca+uZ7YWqW1F3zIo7bKbtrxChGngyYh16ooOEFoxTrLZ4CXAPc2IoRxvXkcK4i2cR0lA==@vger.kernel.org X-Gm-Message-State: AOJu0YzdueG3a7eEA9t+nfp1N8t4Z4sE5SOeGA85gT1egXGLnrc9YMYC L6hSkyqaUga4yYoFUwc1OtNu268MgeAiDNwpKpjCHj4Lvvs2OzZwAVJjOjgcIZa8YUovjFgyQmB GMuQR97M7pj6DtmeUicaGSa7g8y5mbbI92V2I+7K+W26b35gvg2PRzwWXk8s= Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:180e:b0:663:a6e:49a1 with SMTP id 006d021491bc7-67766ad5dfcmr5634892eaf.14.1771326097053; Tue, 17 Feb 2026 03:01:37 -0800 (PST) Date: Tue, 17 Feb 2026 03:01:37 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69944a91.a70a0220.2c38d7.00fc.GAE@google.com> Subject: [syzbot] [wireless?] KMSAN: uninit-value in ieee80211_radiotap_iterator_next From: syzbot To: johannes@sipsolutions.net, linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: ca4ee40bf13d Partly revert "drm/hyperv: Remove reference t.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=175d1b3a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4b4f2aab682301f1 dashboard link: https://syzkaller.appspot.com/bug?extid=b09c1af8764c0097bb19 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/5f321eee08a1/disk-ca4ee40b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e93195c44eb5/vmlinux-ca4ee40b.xz kernel image: https://storage.googleapis.com/syzbot-assets/c3f7091036e0/bzImage-ca4ee40b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b09c1af8764c0097bb19@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in ieee80211_radiotap_iterator_next+0x11f8/0x1620 net/wireless/radiotap.c:317 ieee80211_radiotap_iterator_next+0x11f8/0x1620 net/wireless/radiotap.c:317 ieee80211_parse_tx_radiotap+0x4bb/0x2160 net/mac80211/tx.c:2122 ieee80211_monitor_start_xmit+0x125e/0x1750 net/mac80211/tx.c:2451 __netdev_start_xmit include/linux/netdevice.h:5275 [inline] netdev_start_xmit include/linux/netdevice.h:5284 [inline] xmit_one net/core/dev.c:3864 [inline] dev_hard_start_xmit+0x24e/0xad0 net/core/dev.c:3880 __dev_queue_xmit+0x35e0/0x5a50 net/core/dev.c:4829 dev_queue_xmit include/linux/netdevice.h:3384 [inline] packet_xmit+0x8f/0x710 net/packet/af_packet.c:275 packet_snd net/packet/af_packet.c:3077 [inline] packet_sendmsg+0x91d9/0xa320 net/packet/af_packet.c:3109 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] __sys_sendto+0xa77/0xb90 net/socket.c:2206 __do_sys_sendto net/socket.c:2213 [inline] __se_sys_sendto net/socket.c:2209 [inline] __ia32_sys_sendto+0x12f/0x200 net/socket.c:2209 ia32_sys_call+0x372f/0x4360 arch/x86/include/generated/asm/syscalls_32.h:370 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x17f/0x3f0 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x37/0x80 arch/x86/entry/syscall_32.c:332 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:370 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Uninit was stored to memory at: ieee80211_radiotap_iterator_next+0x14c8/0x1620 net/wireless/radiotap.c:251 ieee80211_parse_tx_radiotap+0x4bb/0x2160 net/mac80211/tx.c:2122 ieee80211_monitor_start_xmit+0x125e/0x1750 net/mac80211/tx.c:2451 __netdev_start_xmit include/linux/netdevice.h:5275 [inline] netdev_start_xmit include/linux/netdevice.h:5284 [inline] xmit_one net/core/dev.c:3864 [inline] dev_hard_start_xmit+0x24e/0xad0 net/core/dev.c:3880 __dev_queue_xmit+0x35e0/0x5a50 net/core/dev.c:4829 dev_queue_xmit include/linux/netdevice.h:3384 [inline] packet_xmit+0x8f/0x710 net/packet/af_packet.c:275 packet_snd net/packet/af_packet.c:3077 [inline] packet_sendmsg+0x91d9/0xa320 net/packet/af_packet.c:3109 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] __sys_sendto+0xa77/0xb90 net/socket.c:2206 __do_sys_sendto net/socket.c:2213 [inline] __se_sys_sendto net/socket.c:2209 [inline] __ia32_sys_sendto+0x12f/0x200 net/socket.c:2209 ia32_sys_call+0x372f/0x4360 arch/x86/include/generated/asm/syscalls_32.h:370 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x17f/0x3f0 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x37/0x80 arch/x86/entry/syscall_32.c:332 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:370 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Local variable iterator created at: ieee80211_parse_tx_radiotap+0xc4/0x2160 net/mac80211/tx.c:2093 ieee80211_monitor_start_xmit+0x125e/0x1750 net/mac80211/tx.c:2451 CPU: 1 UID: 0 PID: 12634 Comm: syz.4.1919 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup