From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f79.google.com (mail-oo1-f79.google.com [209.85.161.79]) (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 A1B463FC5CC for ; Wed, 3 Jun 2026 07:27:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780471656; cv=none; b=gkTQ4/HORv4tvQJ4dY74k5eiuymi3xu63iAYBHDY442MXvr4ksoeq6IhXNeQ/jHvGnuroiaSl+9bVjdrJVlj5oxVzdE7nanEptVfFNxjKFNAGQjLMGMv60Sbucz5NUhkVu+TWz6up2aQA/54ZMySsU5c/NpVvtForlbWVmY2WCg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780471656; c=relaxed/simple; bh=iSImYBRI7UBlesDbd2QGdqtdS5zqWMc/RbpuZaikRF4=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=iRaIxx5TqZntt8GwoZXiaW1XuUpqdYrkqX8J4wNeBHOrXhTlrDqMc+8Mg6lzhC0Vhl5zukqIrRvmT2wzpoXqQOd5MwRpZRdjdPscouVsutHFtLlKCLkTOsiQvmnlY/IkyyZkYZQZD3CpT96C9Tp29iaA4YIVbJ6Q7rEljqlkZsc= 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=209.85.161.79 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-f79.google.com with SMTP id 006d021491bc7-69e4dadd880so349641eaf.3 for ; Wed, 03 Jun 2026 00:27:32 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1780471651; x=1781076451; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=ZtrFMzo+uNmFnPibicXyTEkj5A/kWJ433kEg8stsr6k=; b=V1Ml1/1rKwwV0QZtw6r4Im/6ykcEQkehoVv5ZktEg2e9eAZl4B2RquGxq0qVcTv4nD 2Gj5bXmHsmTqCv6Fh8bjTdQqicyAJT0tnzTL2kF9jVW+HmXbczeNgfqukNkBiE2eB29V 8qVG564BvDpgxm9SO7UbNtM2WxhzUAeTayTk0TMPdpQNPrdMTX9i4AggpFiY3LU4yk0f t9lKOeG37AT8t4DN+bGaANwLYqg3YP9X5ByuujPZAfC+MdBlHWYbsyziDaZ8UgflOaPX 6ES+AdUolxHT2C08Zurs8M+tjjcZfti1Vy/XCn/VSfKDWgrjcM58eaxOBc0svJoPjJga CSWQ== X-Forwarded-Encrypted: i=1; AFNElJ/12gvUzFFmBYGvtqwrcG0fwgH2xXxmb/So7rW/CARWPq0OZHHjYj4O51XOryWF4aOO6QiZ/f+EkmsyjCs=@vger.kernel.org X-Gm-Message-State: AOJu0Yxj6YiKI19eBSnaO1cHzDHvBFReZn4u/fNSPMd8kR9mukrxF06P xCgESMyI9H68vawV9Eggryo5tls9f7rZfvLQIWhDdys48EGg17jlChHZzUsEQd3Y3/hExUvt7AG qFXQMSHslPM+f+E17Cih3mJLmGhGJRFnOW/YCeHHSOcEc1LG+aUv9F+gF7SU= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2c03:b0:69d:7bdb:ade2 with SMTP id 006d021491bc7-69e47f76495mr867512eaf.32.1780471651515; Wed, 03 Jun 2026 00:27:31 -0700 (PDT) Date: Wed, 03 Jun 2026 00:27:31 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a1fd763.278b5b03.2bcf39.0049.GAE@google.com> Subject: [syzbot] [wpan?] KMSAN: uninit-value in lowpan_xmit From: syzbot To: alex.aring@gmail.com, davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-wpan@vger.kernel.org, miquel.raynal@bootlin.com, netdev@vger.kernel.org, pabeni@redhat.com, stefan@datenfreihafen.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: e8c2f9fdadee Merge tag 'for-7.1/hpfs-fixes' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10883b06580000 kernel config: https://syzkaller.appspot.com/x/.config?x=91978e795dcd971b dashboard link: https://syzkaller.appspot.com/bug?extid=f13c19f75e1097abd116 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/6d28568f6ffa/disk-e8c2f9fd.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/68a9eec5e7f1/vmlinux-e8c2f9fd.xz kernel image: https://storage.googleapis.com/syzbot-assets/e6a7381a5e55/bzImage-e8c2f9fd.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f13c19f75e1097abd116@syzkaller.appspotmail.com dev_queue_xmit include/linux/netdevice.h:3418 [inline] tx+0xb6/0x440 drivers/block/aoe/aoenet.c:62 kthread+0x17d/0x370 drivers/block/aoe/aoecmd.c:1241 kthread+0x53a/0x5f0 kernel/kthread.c:436 ret_from_fork+0x20f/0x8d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---[ end trace 0000000000000000 ]--- ===================================================== BUG: KMSAN: uninit-value in lowpan_header net/ieee802154/6lowpan/tx.c:240 [inline] BUG: KMSAN: uninit-value in lowpan_xmit+0xa6b/0x1d00 net/ieee802154/6lowpan/tx.c:282 lowpan_header net/ieee802154/6lowpan/tx.c:240 [inline] lowpan_xmit+0xa6b/0x1d00 net/ieee802154/6lowpan/tx.c:282 __netdev_start_xmit include/linux/netdevice.h:5368 [inline] netdev_start_xmit include/linux/netdevice.h:5377 [inline] xmit_one net/core/dev.c:3888 [inline] dev_hard_start_xmit+0x22f/0xa80 net/core/dev.c:3904 __dev_queue_xmit+0x2990/0x5a00 net/core/dev.c:4870 dev_queue_xmit include/linux/netdevice.h:3418 [inline] tx+0xb6/0x440 drivers/block/aoe/aoenet.c:62 kthread+0x17d/0x370 drivers/block/aoe/aoecmd.c:1241 kthread+0x53a/0x5f0 kernel/kthread.c:436 ret_from_fork+0x20f/0x8d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Uninit was stored to memory at: lowpan_header net/ieee802154/6lowpan/tx.c:231 [inline] lowpan_xmit+0x68f/0x1d00 net/ieee802154/6lowpan/tx.c:282 __netdev_start_xmit include/linux/netdevice.h:5368 [inline] netdev_start_xmit include/linux/netdevice.h:5377 [inline] xmit_one net/core/dev.c:3888 [inline] dev_hard_start_xmit+0x22f/0xa80 net/core/dev.c:3904 __dev_queue_xmit+0x2990/0x5a00 net/core/dev.c:4870 dev_queue_xmit include/linux/netdevice.h:3418 [inline] tx+0xb6/0x440 drivers/block/aoe/aoenet.c:62 kthread+0x17d/0x370 drivers/block/aoe/aoecmd.c:1241 kthread+0x53a/0x5f0 kernel/kthread.c:436 ret_from_fork+0x20f/0x8d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Uninit was created at: slab_post_alloc_hook mm/slub.c:4577 [inline] slab_alloc_node mm/slub.c:4899 [inline] kmem_cache_alloc_node_noprof+0x3cd/0x12c0 mm/slub.c:4951 kmalloc_reserve net/core/skbuff.c:613 [inline] __alloc_skb+0x855/0x1190 net/core/skbuff.c:713 alloc_skb include/linux/skbuff.h:1383 [inline] new_skb+0x4a/0x550 drivers/block/aoe/aoecmd.c:66 aoecmd_cfg_pkts drivers/block/aoe/aoecmd.c:430 [inline] aoecmd_cfg+0x2c2/0xb70 drivers/block/aoe/aoecmd.c:1374 discover_timer+0x64/0x80 drivers/block/aoe/aoemain.c:25 call_timer_fn+0x4c/0x510 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2374 [inline] __run_timer_base+0x80a/0xdb0 kernel/time/timer.c:2386 run_timer_base kernel/time/timer.c:2395 [inline] run_timer_softirq+0x3a/0x70 kernel/time/timer.c:2405 handle_softirqs+0x171/0x7b0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x9a/0x1e0 kernel/softirq.c:735 irq_exit_rcu+0x12/0x20 kernel/softirq.c:752 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0x84/0x90 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:697 CPU: 0 UID: 0 PID: 1310 Comm: aoe_tx0 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 ===================================================== --- 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