From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f79.google.com (mail-io1-f79.google.com [209.85.166.79]) (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 BCF7D1C84DE for ; Mon, 30 Jun 2025 17:07:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751303263; cv=none; b=D8M2BSi7dnGyq6q0NFKLgpGWRyGGsNDf9yhMTcvZu3t99Xd6KsyHCcs/uHzS7ygCJ2Gi1MaG3cW/OmGhIMlXPDvaareBvepe4D/EKq3t5QEMol73U2v54796X8GDctTRN28D4kS+/VCpGbtcBgYlpWzIhRJQG+htIyPW0v2qVF4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751303263; c=relaxed/simple; bh=c3JLAcs7m9aTtuXVUB+C3D0BVbgAzHP8C3+vbqYZodk=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=RfEy/vmcoOz+Chmgk5Mn+vuBtaHWuSCYVq26a3+0I0a0gI0lDGtp+I6B6iK3f064177gcYtBajcnU4Rvfc2nYolyBs63qtiY2ZicKtszvxnSvDGNoNMQfHJUZ1a6PyaN7zLZ3k/2IwgVTH/R0kGliBa/wYPM1u6LCXGGzR93+7g= 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=209.85.166.79 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-io1-f79.google.com with SMTP id ca18e2360f4ac-86d0aa2dc99so200186639f.1 for ; Mon, 30 Jun 2025 10:07:41 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1751303261; x=1751908061; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=4eVH34/JyElyGCncpABHXHf6kfIN2WmIJvCTUgA3HEQ=; b=Rp33njavjtxagY1nJaAJakXVDjU/t5y3byvirCB8o/sRZr+KT1hntSpROSrv3T9GIQ maguOOzRd3m7mSvSCjzWV82ZqFBe8HxLhi5sTxn0uXBz0RjthCWjW8x/pFh3o4ENk4NZ eJH9kSUTjuWXcUzyd25GkWKmIDABeA9e32zrKWhHvySH0NWn0f+AFZUHRGqHHIbhLcl3 LeDKXgTINrK202pZ5I2P7E3ZjqtNZTW5g36AVOrI2+KBQPBwK70Ubex8JZ4plpqyrFMy pwCLx6KoqlG5Fc/gtw4W3TFVQy+m7ISySSIwobhaBIOamIcJbSK/JgOxO+oOkcaATHeq WAMQ== X-Forwarded-Encrypted: i=1; AJvYcCWtJxNvMV73SjMDKC5PJBFf1IezPt5GjO0c8NxXpg1zwxT/1O+9G+KM333AiRt5gGW/50JS8H/s1X96uU8=@vger.kernel.org X-Gm-Message-State: AOJu0YyE5vRs7/wVVfmznVHtjyfuBSCrHYvvb6dk9TTIi+HhXGna3Jpc XmykDaNsTREtNsUYyZ8qJgkMR5yRsQpsym1lkuW3u1nn3SHSo81d7oHkm3qF+89D12S1ZkE44X3 53HI2zYi/48J2/3vE+YifywzjC1AdLZQAkfPz2hf2CQnzZgaWGTkR8VaJhyw= X-Google-Smtp-Source: AGHT+IFnc7V73z7h/yTZD0NLdobDmnUYkaIBhp0J7a3EbG/eiKtDvFtwI3av4DgI57JfmgOGsh/VTEJ+bL5aJvfAIgeVVThTd/4T Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:188e:b0:3df:3ab2:cc7c with SMTP id e9e14a558f8ab-3df4abae83emr151790175ab.13.1751303260942; Mon, 30 Jun 2025 10:07:40 -0700 (PDT) Date: Mon, 30 Jun 2025 10:07:40 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6862c45c.a70a0220.3b7e22.10aa.GAE@google.com> Subject: [syzbot] [batman?] KMSAN: uninit-value in batadv_mcast_mla_update From: syzbot To: antonio@mandelbit.com, b.a.t.m.a.n@lists.open-mesh.org, davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, marek.lindner@mailbox.org, netdev@vger.kernel.org, pabeni@redhat.com, sven@narfation.org, sw@simonwunderlich.de, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: ee88bddf7f2f Merge tag 'bpf-fixes' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12b1db70580000 kernel config: https://syzkaller.appspot.com/x/.config?x=595d344ff0b23ac5 dashboard link: https://syzkaller.appspot.com/bug?extid=1daa6a8aecb922ad3c30 compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/405f6113ec86/disk-ee88bddf.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/57f4fa239393/vmlinux-ee88bddf.xz kernel image: https://storage.googleapis.com/syzbot-assets/32892fe29e1c/bzImage-ee88bddf.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1daa6a8aecb922ad3c30@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in batadv_mcast_mla_is_duplicate net/batman-adv/multicast.c:347 [inline] BUG: KMSAN: uninit-value in batadv_mcast_mla_tt_retract net/batman-adv/multicast.c:692 [inline] BUG: KMSAN: uninit-value in __batadv_mcast_mla_update net/batman-adv/multicast.c:920 [inline] BUG: KMSAN: uninit-value in batadv_mcast_mla_update+0x35f4/0x4f80 net/batman-adv/multicast.c:948 batadv_mcast_mla_is_duplicate net/batman-adv/multicast.c:347 [inline] batadv_mcast_mla_tt_retract net/batman-adv/multicast.c:692 [inline] __batadv_mcast_mla_update net/batman-adv/multicast.c:920 [inline] batadv_mcast_mla_update+0x35f4/0x4f80 net/batman-adv/multicast.c:948 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xb91/0x1d80 kernel/workqueue.c:3321 worker_thread+0xedf/0x1590 kernel/workqueue.c:3402 kthread+0xd5c/0xf00 kernel/kthread.c:464 ret_from_fork+0x1e3/0x310 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Uninit was created at: slab_post_alloc_hook mm/slub.c:4154 [inline] slab_alloc_node mm/slub.c:4197 [inline] __kmalloc_cache_noprof+0x7f7/0xed0 mm/slub.c:4354 kmalloc_noprof include/linux/slab.h:905 [inline] batadv_mcast_mla_meshif_get_ipv6 net/batman-adv/multicast.c:477 [inline] batadv_mcast_mla_meshif_get net/batman-adv/multicast.c:535 [inline] __batadv_mcast_mla_update net/batman-adv/multicast.c:911 [inline] batadv_mcast_mla_update+0x1c17/0x4f80 net/batman-adv/multicast.c:948 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xb91/0x1d80 kernel/workqueue.c:3321 worker_thread+0xedf/0x1590 kernel/workqueue.c:3402 kthread+0xd5c/0xf00 kernel/kthread.c:464 ret_from_fork+0x1e3/0x310 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 CPU: 1 UID: 0 PID: 68 Comm: kworker/u8:4 Tainted: G W 6.16.0-rc3-syzkaller-00072-gee88bddf7f2f #0 PREEMPT(undef) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: bat_events batadv_mcast_mla_update ===================================================== --- 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