From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f205.google.com (mail-oi1-f205.google.com [209.85.167.205]) (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 DB2372DB795 for ; Thu, 2 Apr 2026 18:55:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.205 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775156124; cv=none; b=QGmOKev39miVCgZUuZ2hS/YSdbu40XM9AkpSPpoVJRtHXO8zqnjw98PCd7HoiLw5vS4cjXY/ghJb8732R4ZgoYpwRvZsqLbBLW+7zSLsJtu+bwkoOuEHu5PUsBVx6fbDgAPQrMjn/IrdoJYLziWRu+Lp/3qZHgdWtrCdu77Cf98= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775156124; c=relaxed/simple; bh=v4D8ZsKHnbaJ67QDI3+zxUksXBKK82rn1hgW2WsB3t8=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=IUZcdKZ02aXFbg64Kc89amNHFFMXytP3aPpetKxccCYQLk1a+1lYoguXEa/OnXsFQozUyUj6MqLl/3hLbHQwLYVCFdKOdSK6nnWVys5jA+rjk3QGEmEMrgQA0RfgzLV1sR/WV6dkfrQcfK8M02KyrC7ulAOU7zBEAZRaZcPy8pA= 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=209.85.167.205 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-oi1-f205.google.com with SMTP id 5614622812f47-464bbea2120so2181524b6e.3 for ; Thu, 02 Apr 2026 11:55:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775156122; x=1775760922; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=wNcxSEY5NOWNLka6D9MuHLN0NTGzwvctLz+fnYD5UIM=; b=r6uRA+BR/mNL2vyNnayRVqkMB39JRFDZ2KIzrAk6fGh/nD7tNJqj0+0y5uKGcfiBW9 WwSvYc1XHTg2h54QcNNOjMSRL5nck0BjK27gf+kSIaMBuHhr+6zoVbhbNpBJWd08dObS 7+YtOpcqJt7RPnPuaipO0beZeHc47bUIRhV07kJ7aVKOqBwj6HT1qPyfhABZZ+xHdxKG /kc2per/JNHh9bbe9PbHJG2X+iiQmnVRStgvwsbqznnSh1S8xj6PTpE7xXUYaO9xYyYS mkIpVNyayDzY90Q4IwUgaFrwRYD1jjduFh5Xiiw8BEmFV7J241P5vEz2nbldHE6+u5Xg XKfQ== X-Forwarded-Encrypted: i=1; AJvYcCXUwYHRQQrv4eR0Bx/ABGcmtvloMpAAmZnjUdP6YdwmVOjXyxw25cCqkm3a6FeHfo3O2HYrzFU5NYawoWA=@vger.kernel.org X-Gm-Message-State: AOJu0YwsQzmp77eRWrEMAlJZ7IYO5wRT0fM13K7YKcO0FKP7LxJXAF8j HQ4JvLvsOnGpNRNAw6zZnumOt76nU2MckguAfVTm97S9cUSI3gleZ9rMSWQ/nPFJ0PBXycgh7pI gZgTtdx5BkaIKkmY1Bx4qT6k12xrwljdFM2orDI6XEaSWQK84KuyG3i7C0m0= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2215:b0:67e:1be4:da46 with SMTP id 006d021491bc7-6821fe61a6bmr199698eaf.39.1775156121939; Thu, 02 Apr 2026 11:55:21 -0700 (PDT) Date: Thu, 02 Apr 2026 11:55:21 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69cebb99.050a0220.2dbe29.0007.GAE@google.com> Subject: [syzbot] [xfs?] KMSAN: uninit-value in xlog_verify_head From: syzbot To: cem@kernel.org, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: cbfffcca2bf0 Merge tag 'trace-v7.0-rc5' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13b5ff52580000 kernel config: https://syzkaller.appspot.com/x/.config?x=963de479f54c6dbb dashboard link: https://syzkaller.appspot.com/bug?extid=b7dfbed0c6c2b5e9fd34 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/b6db7d9b793c/disk-cbfffcca.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/027636820b95/vmlinux-cbfffcca.xz kernel image: https://storage.googleapis.com/syzbot-assets/b7d1a553de59/bzImage-cbfffcca.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b7dfbed0c6c2b5e9fd34@syzkaller.appspotmail.com XFS (loop4): Mounting V5 Filesystem d7dc424e-7990-42cb-9f91-9cb7200a101d ===================================================== BUG: KMSAN: uninit-value in xlog_verify_head+0x6c3/0x910 fs/xfs/xfs_log_recover.c:1058 xlog_verify_head+0x6c3/0x910 fs/xfs/xfs_log_recover.c:1058 xlog_find_tail+0xc2e/0x1a50 fs/xfs/xfs_log_recover.c:1315 xlog_recover+0x6d/0x800 fs/xfs/xfs_log_recover.c:3426 xfs_log_mount+0x4da/0x880 fs/xfs/xfs_log.c:617 xfs_mountfs+0x1599/0x2d00 fs/xfs/xfs_mount.c:1034 xfs_fs_fill_super+0x2603/0x2be0 fs/xfs/xfs_super.c:1938 get_tree_bdev_flags+0x6e6/0x920 fs/super.c:1694 get_tree_bdev+0x38/0x50 fs/super.c:1717 xfs_fs_get_tree+0x35/0x40 fs/xfs/xfs_super.c:1985 vfs_get_tree+0xb3/0x5d0 fs/super.c:1754 fc_mount fs/namespace.c:1193 [inline] do_new_mount_fc fs/namespace.c:3763 [inline] do_new_mount+0x885/0x1dd0 fs/namespace.c:3839 path_mount+0x7a2/0x20b0 fs/namespace.c:4159 do_mount fs/namespace.c:4172 [inline] __do_sys_mount fs/namespace.c:4361 [inline] __se_sys_mount+0x704/0x7f0 fs/namespace.c:4338 __ia32_sys_mount+0xe2/0x150 fs/namespace.c:4338 ia32_sys_call+0x27fe/0x4360 arch/x86/include/generated/asm/syscalls_32.h:22 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: xlog_verify_head+0x6bc/0x910 fs/xfs/xfs_log_recover.c:1058 xlog_find_tail+0xc2e/0x1a50 fs/xfs/xfs_log_recover.c:1315 xlog_recover+0x6d/0x800 fs/xfs/xfs_log_recover.c:3426 xfs_log_mount+0x4da/0x880 fs/xfs/xfs_log.c:617 xfs_mountfs+0x1599/0x2d00 fs/xfs/xfs_mount.c:1034 xfs_fs_fill_super+0x2603/0x2be0 fs/xfs/xfs_super.c:1938 get_tree_bdev_flags+0x6e6/0x920 fs/super.c:1694 get_tree_bdev+0x38/0x50 fs/super.c:1717 xfs_fs_get_tree+0x35/0x40 fs/xfs/xfs_super.c:1985 vfs_get_tree+0xb3/0x5d0 fs/super.c:1754 fc_mount fs/namespace.c:1193 [inline] do_new_mount_fc fs/namespace.c:3763 [inline] do_new_mount+0x885/0x1dd0 fs/namespace.c:3839 path_mount+0x7a2/0x20b0 fs/namespace.c:4159 do_mount fs/namespace.c:4172 [inline] __do_sys_mount fs/namespace.c:4361 [inline] __se_sys_mount+0x704/0x7f0 fs/namespace.c:4338 __ia32_sys_mount+0xe2/0x150 fs/namespace.c:4338 ia32_sys_call+0x27fe/0x4360 arch/x86/include/generated/asm/syscalls_32.h:22 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 tmp_rhead_blk created at: xlog_verify_head+0x81/0x910 fs/xfs/xfs_log_recover.c:1032 xlog_find_tail+0xc2e/0x1a50 fs/xfs/xfs_log_recover.c:1315 CPU: 1 UID: 0 PID: 7664 Comm: syz.4.285 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP 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