From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f70.google.com (mail-ot1-f70.google.com [209.85.210.70]) (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 89F8F3033CB for ; Mon, 23 Feb 2026 22:56:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.70 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771887385; cv=none; b=GlmoF1loE0LAK+bDpkdh7UaJy7leQV6/5VA4NMULbiZ0ghfp5S83in4TqgqzSYuMRSh2h6erhmS2cctq1ChhDl2S/1e16+n5tI4qgMPTG2f28qRZEydNYK6e+MB05oOjv1EUwPsxvTBDaPSv+WdJ64V5olZMaLY2/vPnfw9rjBE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771887385; c=relaxed/simple; bh=krVxbB9hjqNkFJe33bowPmxCyM5sEf1Z7ckFMRNkvG4=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=ETa/KjUQzO8oU7QWFVQRMm/eLCgC2M4Kr/B1u4T1zoyxZMdG9m/36G9nyn1s8lZ4PMRIlLUk6nsoC3nSd3RT7l436z8aAhg1UbI5aUn9vJK9yjED0W8kiJc+hu7Ty7Yg2aBWrE2K/3yXnvjDjWQ4bSp7L/K3NaIQha+cynq69Lw= 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=209.85.210.70 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-f70.google.com with SMTP id 46e09a7af769-7d192f35a9dso48015783a34.3 for ; Mon, 23 Feb 2026 14:56:24 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1771887383; x=1772492183; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=JsJ5Ot0LcjZFprG/Pz8/vPYhS2humQ6zC3BAqr2fbg0=; b=jAwanlzaohNGbGt1SVG5Po7gk59vWEJeXo1srAJM0AALXMkG+SS83qhC0NhnlWM/lb YGI2tyzqh2YgvYW9Cn83VPG3gvEBjVTjwAO+KmrehmOFoWQZfGXgwaSn/NTRnOtD36sr KFircUQOqzrkm4QICGOrBV+fdQUm23c2Uqh7KzBNTwH8cZNbInhAm3/6IwA252IMW96B is9i583mDp2dG/Yh9+KT0kkE+ghwOq8VQnqxB3Qs84zSG0sDt3pqQ0+eN/f2l5+c50Ep EMO+Z1LSuQ8ahFwgyCMrUtie3tdiUKx33rxPgSLir44eIkn924sJLXBGyf+LOxD530aS B04g== X-Forwarded-Encrypted: i=1; AJvYcCUpXPcb/riVAr0H6EeRUAKS2OFbk+qNBIbxUKn0JZKAE7dqBBv/tJU1HWrn9yRVnA6kgiv2PPGzCg3qVw==@vger.kernel.org X-Gm-Message-State: AOJu0YzM21iqSQk+ntsNCQHQWCKdvNCuN07Cy6FSUqr8BODENoFiMxd+ /AWJwBmaNfm51YUl7JBJ79CuN4L6UrrzLWE/h+6OsAQTkvFY7ZLRMmftprn9Kq44+fS2GINq7vI op0qcW4vTRYHrPPGLQ2Fho6WqrSjI05JNy6SwioJBYPCawlpzlscB2xCrYM8= Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:4912:b0:676:cd01:3da4 with SMTP id 006d021491bc7-679c44e7588mr4568103eaf.39.1771887383407; Mon, 23 Feb 2026 14:56:23 -0800 (PST) Date: Mon, 23 Feb 2026 14:56:23 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <699cdb17.050a0220.247d23.033c.GAE@google.com> Subject: [syzbot] [btrfs?] WARNING in btrfs_add_link (2) 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: 8bf22c33e7a1 Merge tag 'net-7.0-rc1' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=113f495a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=abe4fa590468dbfb dashboard link: https://syzkaller.appspot.com/bug?extid=f3a86ba8f6ee221654cd 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/010f0532c934/disk-8bf22c33.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ed0946db3f63/vmlinux-8bf22c33.xz kernel image: https://storage.googleapis.com/syzbot-assets/ef1efd866885/bzImage-8bf22c33.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f3a86ba8f6ee221654cd@syzkaller.appspotmail.com ---------[ 137.618642][ T6713] ------------[ cut here ]------------ BTRFS: Transaction aborted (error -28) WARNING: fs/btrfs/inode.c:6871 at btrfs_add_link+0xc1a/0xec0 fs/btrfs/inode.c:6871, CPU#1: syz.5.90/6713 Modules linked in: CPU: 1 UID: 0 PID: 6713 Comm: syz.5.90 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:btrfs_add_link+0xc1e/0xec0 fs/btrfs/inode.c:6871 Code: e1 fd e9 ae 00 00 00 e8 b0 e3 c6 fd 84 c0 74 24 e8 17 dc e1 fd e9 9b 00 00 00 e8 0d dc e1 fd 48 8d 3d e6 64 90 0b 8b 74 24 08 <67> 48 0f b9 3a e9 76 fb ff ff e8 f3 7f 3f 07 41 89 c7 31 ff 89 c6 RSP: 0018:ffffc90005a07860 EFLAGS: 00010287 RAX: ffffffff83e27803 RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc9001cdb1000 RSI: 00000000ffffffe4 RDI: ffffffff8f72dcf0 RBP: ffffc90005a07990 R08: ffff88802928bc80 R09: 0000000000000003 R10: 0000000000000100 R11: 00000000fffffffb R12: 1ffff1100c31e974 R13: 00000000ffffffe4 R14: ffff8880618f4ba0 R15: ffff88802a5f8001 FS: 00007f58cbb646c0(0000) GS:ffff888126442000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9c22d1fb4c CR3: 000000003d082000 CR4: 00000000003526f0 Call Trace: btrfs_create_new_inode+0x11e7/0x20e0 fs/btrfs/inode.c:6804 btrfs_create_common+0x189/0x310 fs/btrfs/inode.c:6930 btrfs_mkdir+0xc7/0xf0 fs/btrfs/inode.c:7069 vfs_mkdir+0x40b/0x630 fs/namei.c:5233 filename_mkdirat+0x289/0x520 fs/namei.c:5266 __do_sys_mkdirat fs/namei.c:5287 [inline] __se_sys_mkdirat+0x35/0x150 fs/namei.c:5284 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f58cd94b507 Code: 00 66 90 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 db f7 ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 b8 02 01 00 00 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:00007f58cbb63e58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f58cbb63ee0 RCX: 00007f58cd94b507 RDX: 00000000000001ff RSI: 00002000000000c0 RDI: 00000000ffffff9c RBP: 0000200000000080 R08: 0000200000000140 R09: 0000000000000000 R10: 0000200000000080 R11: 0000000000000246 R12: 00002000000000c0 R13: 00007f58cbb63ea0 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess): 0: e1 fd loope 0xffffffff 2: e9 ae 00 00 00 jmp 0xb5 7: e8 b0 e3 c6 fd call 0xfdc6e3bc c: 84 c0 test %al,%al e: 74 24 je 0x34 10: e8 17 dc e1 fd call 0xfde1dc2c 15: e9 9b 00 00 00 jmp 0xb5 1a: e8 0d dc e1 fd call 0xfde1dc2c 1f: 48 8d 3d e6 64 90 0b lea 0xb9064e6(%rip),%rdi # 0xb90650c 26: 8b 74 24 08 mov 0x8(%rsp),%esi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 76 fb ff ff jmp 0xfffffbaa 34: e8 f3 7f 3f 07 call 0x73f802c 39: 41 89 c7 mov %eax,%r15d 3c: 31 ff xor %edi,%edi 3e: 89 c6 mov %eax,%esi --- 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