From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f207.google.com (mail-oi1-f207.google.com [209.85.167.207]) (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 498F549620 for ; Mon, 10 Aug 2026 00:34:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.207 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786322070; cv=none; b=j2hIhnsLQu9DQGxuvJvMRCnEOl9snoHwpqIFtdB+34EQSFkKHxzriwHsVsj7SsauM70GtqyPE4TlRoGUgWDmuGdn4GVZQYk/1QJYxirjUnIFBiMKFjpSLQCvvxU310WNuayCYl5rvUg6q/OvpgO1fsK7fbxlGnrnmeyeLV2SToY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786322070; c=relaxed/simple; bh=yf0Yg2BZEyXTPnZFI70/uOYfiqHNOhLhLsSFtHg/hNU=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=HC8ssXt1iDlgnI83bYERZ3wn4UIGXAGgH/udd/aCI47K9x3Bs6ArmV++4wOLhHqgXIG/GfR4tFT+3H39nvoTo9bnJSh2cyqYG4B5/Zv94pBl/sHTKK47Q1S775ljmcuCJRL/bW95EMms8nsa0e0CeW1xFT3Nukxc9+mkhFU/StI= 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=209.85.167.207 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-f207.google.com with SMTP id 5614622812f47-4a416619e8dso2498297b6e.1 for ; Sun, 09 Aug 2026 17:34:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786322068; x=1786926868; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=UvCgGx+8Hwf/2ac1wbaF2WX/q14zt4C8bFfNBBcFcmY=; b=UgbtcVYTsblPY4qArwk/4EmzsaXtfjciKKwwYR5SomVNAt1swRICoEQh789XeYvMIe RfEqTpIjBL7cekUnv/5VZhN3wsc9m/4jOZeYajYOZW6wRzw/2DGR0GwcoNgVntBknBIE 7EOXYybj7Fh/Zi25BQkFZyBhlEaz6R1M24S+Mj0zWo6yL5x3d2MvoEiHSrewxBciwLHb 2Au/NYm5pvdwnZFtOOosRaVfz++hJBqim2mMQx7nN+7QwD/r3Wt6GaD1gN6AIuSL2EO0 AznJPyVN1XFB4m+alUVrITY35r382DX0cEzsZk4XC693XF30zh6x+HCEsTtZin01pLWQ Kphw== X-Forwarded-Encrypted: i=1; AHgh+Rp+6poO7wZgiiQE+yWg58953JvyCrhHn85N5EVqQnUIk5AmNFxR25NO1h7x2siApcenTEKrux2cjIWtAE8=@vger.kernel.org X-Gm-Message-State: AOJu0YyCMoPlAMA9BssLkSugmw4Nn8o9MAuUjR8CZP4peFzyt0Sp6bXw DyF51ueDy8JooJxEKSjUcLzGZiJy8RsyZ1rXgwybG7M+ikActdqFsBUg+R/mNfEZuBjWmREVvth HZkYRGW4GYQdHgecRb3HG7cqDqEJ51VMFiNOLAD3UTpSUlduXASlOUAogbh8= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:1824:b0:4a4:cedc:6859 with SMTP id 5614622812f47-4b1af69b549mr8483198b6e.4.1786322068310; Sun, 09 Aug 2026 17:34:28 -0700 (PDT) Date: Sun, 09 Aug 2026 17:34:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a791c94.01d0871a.3a0d52.0099.GAE@google.com> Subject: [syzbot] [btrfs?] WARNING in btrfs_init_new_device From: syzbot To: clm@fb.com, dsterba@suse.com, linux-btrfs@vger.kernel.org, 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: 848acc8ffe1b Merge tag 'fsverity-for-linus' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17e65bb9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b7079b368dcec295 dashboard link: https://syzkaller.appspot.com/bug?extid=3bf3e110b2d406b8166c compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/25bde0bfecb5/disk-848acc8f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/8a5ebf809884/vmlinux-848acc8f.xz kernel image: https://storage.googleapis.com/syzbot-assets/1d1810845ac3/bzImage-848acc8f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3bf3e110b2d406b8166c@syzkaller.appspotmail.com kobject: kobject_add_internal failed for 2 with -EEXIST, don't try to register things with the same name in the same directory. BTRFS warning (device loop7): devinfo init for devid 2 failed: -17 ------------[ cut here ]------------ btrfs_abort_should_print_stack(__error) WARNING: fs/btrfs/volumes.c:3013 at btrfs_init_new_device+0x1fc6/0x3e70 fs/btrfs/volumes.c:3013, CPU#1: syz.7.121/6685 Modules linked in: CPU: 1 UID: 0 PID: 6685 Comm: syz.7.121 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:btrfs_init_new_device+0x1fc6/0x3e70 fs/btrfs/volumes.c:3013 Code: fd 48 c7 c6 60 79 29 8c e8 97 62 a4 fd 8d 45 1e 83 f8 19 77 0f ba 01 00 04 02 48 0f a3 c2 0f 82 94 8b ca fc e8 ab 67 a4 fd 90 <0f> 0b 90 e9 86 8b ca fc e8 9d 67 a4 fd 48 8b 7c 24 40 e8 e3 81 f3 RSP: 0018:ffffc90005627960 EFLAGS: 00010283 RAX: 0000000000030d92 RBX: ffff88807adf0000 RCX: ffffc9002560b000 RDX: 0000000000080000 RSI: ffffffff8465ec15 RDI: ffff8880207d0000 RBP: 00000000ffffffef R08: 0000000000000005 R09: fffffffffffffffb R10: ffffffffffffffef R11: 0000000000000000 R12: ffff888079bb4a80 R13: ffff88807adf1c00 R14: ffff88802bc92000 R15: ffff88805186c5e0 FS: 00007f40c8b946c0(0000) GS:ffff888123ed9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7e4921b1d4 CR3: 000000002d0c8000 CR4: 0000000000350ef0 Call Trace: btrfs_ioctl_add_dev+0x34a/0x5f0 fs/btrfs/ioctl.c:2558 btrfs_ioctl+0xce8/0x5d10 fs/btrfs/ioctl.c:5529 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f40c7d9e019 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f40c8b94028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f40c8026090 RCX: 00007f40c7d9e019 RDX: 00002000000023c0 RSI: 000000005000940a RDI: 0000000000000009 RBP: 00007f40c7e3500c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f40c8026128 R14: 00007f40c8026090 R15: 00007fff8c42dc38 --- 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