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 DD10D78F39 for ; Fri, 9 May 2025 20:00:27 +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=1746820829; cv=none; b=EPbun8Vi8279YLZ2ytku9y6nk3JGnWlc4MCWGULG0m/LVluIllVwZZbqGiuEjpsx3txdCn+2A13PGBNnNnbqVPyR7KsR+k1cBXJToAiNtbiR+wbfh6uHM/LTouKSz3EhMD2Xz+elnajDx13HB37UFaXOI08DbDF6SqA2RM9o704= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746820829; c=relaxed/simple; bh=2aZJi90JXyrvmkIK5CBaOEyHjcCKQqsSifXJYutTtDA=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=Bmrlba1xvN1lpm81aUCv0sw9hp1lhlMRBH4o34O2Svrljzr5IS0Yjyi/eNuD6XlYEv4K8Q7DxeV/8giyF/UDQwK9P1KaOtOjbsMmq3wS6IwtR0UcfGpvfMCxSJdXSihCMtFOaytPCisZEwf6fMaQW63mkK/JqXWnWoiVOic6bMU= 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-85db3356bafso434667339f.3 for ; Fri, 09 May 2025 13:00:27 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1746820827; x=1747425627; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=bCQtphB0FemzCy19IwV6cQERYXbXPlbaTZmPEyFJTGI=; b=jfpFC7q65CfN35Poe1dy0ApI5flXa7/y9fM9hMWNXzY7Tp1odWRT9U3tIrxt2ftxTj 7hwe14S0bbZkEpUgqm5O4yuSiXDOvLQih079C7xnzOH2CGVK9VPNxCDh8jVaNLigXxub l4ynGr5o9uft3lzQuZ8i0Hf5yjA4m5PBan8IT+pOwSjt9u0h9WuDlMD01oktZAE4pvzE 5O5cXTLqkPIlQDU0D3l3o4In0ynoOTm6Re0+z81cBlbsFbPIdLszR79nS358aCmDiSAH Ty4e3fGMFs4i1uaaVZoQ+xNXxybpOT+QNmj78hRoA4ZdaqaYAUO+XtqsdgTPSGznSN25 WbEg== X-Forwarded-Encrypted: i=1; AJvYcCVv0qxlqcdDNM0VSeio9bXeEFfhIWV8MAr7nLsi4nk8b4GGvqL4jpSnBSOMN8sTRpXBN6NX3HikjugCk7w=@vger.kernel.org X-Gm-Message-State: AOJu0YyiCGzRfeYQFXJ/Fp4NiaisLwCLa0gGx9C66XhxUCkJy+VW0xfd dRRP1sEIlUfSmn0zG2ubjt0T0ZasQJNAo+COztjGr/KY70rjQ7gc45c8rEOkILn31QOaNeBSFkw qJqD3cZgeLwynaoTn2ZqUOlaWoh/jNhdHtp25KYGIZYyq0LHNKImZDow= X-Google-Smtp-Source: AGHT+IFS1QqSUbqR7M7CBn7/jSPir9EcUhhf7mriUS+G5//b7VHIh2HGn9UpRPzgIvf03d2pRHHD+iUCvyv3SGjcENr4tG5dY9JM Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:3425:b0:867:d48:342b with SMTP id ca18e2360f4ac-867636223a2mr517642539f.11.1746820827029; Fri, 09 May 2025 13:00:27 -0700 (PDT) Date: Fri, 09 May 2025 13:00:27 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <681e5edb.050a0220.a19a9.013e.GAE@google.com> Subject: [syzbot] [net?] KMSAN: uninit-value in __ipv6_dev_mc_inc (2) From: syzbot To: davem@davemloft.net, dsahern@kernel.org, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 02ddfb981de8 Merge tag 'scsi-fixes' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=149d2cf4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9dc42c34a3f5c357 dashboard link: https://syzkaller.appspot.com/bug?extid=3735d5f00e991698985a compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/5ca57f5a3f77/disk-02ddfb98.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3f23cbc11e68/vmlinux-02ddfb98.xz kernel image: https://storage.googleapis.com/syzbot-assets/73e63afac354/bzImage-02ddfb98.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3735d5f00e991698985a@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in __ipv6_dev_mc_inc+0x4f0/0x1640 net/ipv6/mcast.c:966 __ipv6_dev_mc_inc+0x4f0/0x1640 net/ipv6/mcast.c:966 ipv6_dev_mc_inc+0x38/0x50 net/ipv6/mcast.c:997 addrconf_join_solict net/ipv6/addrconf.c:2242 [inline] addrconf_dad_begin net/ipv6/addrconf.c:4100 [inline] addrconf_dad_work+0x401/0x1d10 net/ipv6/addrconf.c:4228 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xb97/0x1d90 kernel/workqueue.c:3319 worker_thread+0xedf/0x1590 kernel/workqueue.c:3400 kthread+0xd59/0xf00 kernel/kthread.c:464 ret_from_fork+0x6e/0x90 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Local variable maddr.i.i created at: addrconf_join_solict net/ipv6/addrconf.c:2236 [inline] addrconf_dad_begin net/ipv6/addrconf.c:4100 [inline] addrconf_dad_work+0x244/0x1d10 net/ipv6/addrconf.c:4228 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xb97/0x1d90 kernel/workqueue.c:3319 CPU: 1 UID: 0 PID: 3845 Comm: kworker/u8:19 Not tainted 6.15.0-rc3-syzkaller-00094-g02ddfb981de8 #0 PREEMPT(undef) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025 Workqueue: ipv6_addrconf addrconf_dad_work ===================================================== --- 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