From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f77.google.com (mail-ot1-f77.google.com [209.85.210.77]) (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 E9F1E1A239A for ; Fri, 10 Apr 2026 23:44:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775864673; cv=none; b=nbWOwQ19yhGzSFrxH7Tulcg57JLMkAWHbldphDDpVMbmF419rKipWNfg7hrfC8PN4uJm506+bVcTjEfPG2sW0imJZ2iKYLnA1q8wJhsK7p9BEz4l5S6yLcvQ4UGJpCSCxqZYrIJKN1z+HJPwqfsgVrQhLCou1496zG4EIrn9ANo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775864673; c=relaxed/simple; bh=Q3jnOfaH7TBuuaOSY58AiRur1ECErYX6v5g5FtILBZs=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=Gu3chzSA3cMTMUdpUS/CUJ+ufdAfDr0SohgpwCrOHVwl4CfXmyhlf4hIHVTG2Oyo+8CmO9rE+EagobM+NL7Gb4sVluBKpTV0AuMCHPjqInYTsTjaXUH7WQ0rTZQt0T2cqzUDz1WMPAHQVhmAzKPEnBUvPkzp8uThP8X6x36nNrc= 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=209.85.210.77 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-ot1-f77.google.com with SMTP id 46e09a7af769-7dbc09d4e43so5909580a34.1 for ; Fri, 10 Apr 2026 16:44:31 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775864671; x=1776469471; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=3ioRIJDeVpp+taUlSB6Kx0aD6G/bId8nCLdbPJnQ8rA=; b=TIq2+sLk7ueScl6BCOlxOvzQIDVpbRVhMZCGRrTWFGqipcWq0uzRStLqK0NzqIeeVq gSpmlkZ9xigEWKoADGghC3ev6vWkCwoTcKhn13jnkkfGXeNa82LnDgygaErsrmUOK0uH yZlmnZgAe9Ofqv6UpoCiQb2lBzPmqybexHZIJXW9ETZWZvvklCeiReTH/AY7QjX8JkyP i6ThQesqBuY5jiYuQcP5C2LRX+SAuBVlA3vC7OjxkTBUaESu2LBkqTHwOUzI1Fm8jR67 rKNSvCvZqYdJ+X/pGNMoTqUP5+0dYYZhYCc6NzXhg7yR5FKkk3a4F18OJUdBsBa4F7uW 3Iow== X-Gm-Message-State: AOJu0YziBFyWyH7rvOPo+i7bSQFFp25XUdk7melW6sGz0H8iWuPiwh1V NaIAtrXXVNVQQiMQOYh847IQZU5DwCc8qjVz4+lUQt7UoCqCLPOYL8DIwJ6htVkeXIpURQKAwGX Ams1UA8J1L2COTQSdE4jbz+uD1qqIIxnpO4wkvoQwwjBeiDVWoqqjL0N/VceLGw== Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a4a:de14:0:b0:689:232a:a9ba with SMTP id 006d021491bc7-68a6ae80e37mr3658195eaf.35.1775864670982; Fri, 10 Apr 2026 16:44:30 -0700 (PDT) Date: Fri, 10 Apr 2026 16:44:30 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69d98b5e.a00a0220.468cb.002d.GAE@google.com> Subject: [syzbot] [kernel?] KMSAN: uninit-value in from_kgid_munged (2) From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 8b02520ec5f7 Merge tag 'iommu-fixes-v7.0-rc7' of git://git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=150aca6a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=963de479f54c6dbb dashboard link: https://syzkaller.appspot.com/bug?extid=0bd8f2ed639fbed5667a 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/3e6cff17723a/disk-8b02520e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/641668972ac5/vmlinux-8b02520e.xz kernel image: https://storage.googleapis.com/syzbot-assets/0360371e7446/bzImage-8b02520e.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0bd8f2ed639fbed5667a@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in map_id_range_up_base kernel/user_namespace.c:360 [inline] BUG: KMSAN: uninit-value in map_id_range_up kernel/user_namespace.c:391 [inline] BUG: KMSAN: uninit-value in map_id_up kernel/user_namespace.c:406 [inline] BUG: KMSAN: uninit-value in from_kgid kernel/user_namespace.c:512 [inline] BUG: KMSAN: uninit-value in from_kgid_munged+0x582/0xc40 kernel/user_namespace.c:536 map_id_range_up_base kernel/user_namespace.c:360 [inline] map_id_range_up kernel/user_namespace.c:391 [inline] map_id_up kernel/user_namespace.c:406 [inline] from_kgid kernel/user_namespace.c:512 [inline] from_kgid_munged+0x582/0xc40 kernel/user_namespace.c:536 __scm_recv_common+0x2a6/0x910 net/core/scm.c:514 scm_recv_unix+0x5e/0x580 net/core/scm.c:541 __unix_dgram_recvmsg+0x14e1/0x1750 net/unix/af_unix.c:2652 unix_dgram_recvmsg+0x115/0x180 net/unix/af_unix.c:2672 sock_recvmsg_nosec net/socket.c:1078 [inline] sock_recvmsg+0x27b/0x310 net/socket.c:1100 ____sys_recvmsg+0x193/0x620 net/socket.c:2812 ___sys_recvmsg+0x20b/0x850 net/socket.c:2854 __sys_recvmsg net/socket.c:2887 [inline] __do_sys_recvmsg net/socket.c:2893 [inline] __se_sys_recvmsg net/socket.c:2890 [inline] __x64_sys_recvmsg+0x20e/0x3d0 net/socket.c:2890 x64_sys_call+0x35cc/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:48 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable scm created at: __unix_dgram_recvmsg+0x4d/0x1750 net/unix/af_unix.c:2555 unix_dgram_recvmsg+0x115/0x180 net/unix/af_unix.c:2672 CPU: 1 UID: 0 PID: 5132 Comm: udevd Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 ===================================================== --- 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