From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f79.google.com (mail-oo1-f79.google.com [209.85.161.79]) (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 B2AFE221DB3 for ; Mon, 10 Aug 2026 00:34:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786322071; cv=none; b=eXdLBGk6Jl7z9/ycAnCReLIdUVbO5wmOzTgQd0vsJT+iQ+XdlGk0S6kaov+okJhvDJm7YHUP2+B5OX2/K8JGYMzAdSS7e7wsl8zRdy83ZZTxF3hDb7mzkT1bsBddtpriZtOyh1G+HcciYIQTH7tKaELfnmPOeXGkTGckYbqm0mw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786322071; c=relaxed/simple; bh=Tqq+gSWOUfswIoZP77Io+QWdLXiOFhXKNULLuD4Q/QI=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=ZMnnPdLnk9B6aHLVJdipexTxq+Rn5IgwJHzp4dM+TotlHAZ3JBGHA9TEe3gBJ/NRKFYp6G41CyhMArYS8E38vNzfkOPGeoUZ714O6aGvZdoZTal16yiAVkOh5Ry5dQjmBjqxDUp0p/DF8AhyN7GRYAP/0vzx6La26cHbSMyWghY= 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=209.85.161.79 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-oo1-f79.google.com with SMTP id 006d021491bc7-6ae46631c42so770287eaf.2 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=mDzf2PQuyzGK1ykg5zMa58wZtreRHGRIgzpNZ/559A8=; b=RGJhMdnxyQkVfqJs4l8vlFDsK6NinsNanR2DXKKUQzIz4mMN1WmnrsCnDwhk/5kCqn kqWYP0Z9oa2490UESKgy0YpJ4FSqnIAyrWsltqti37IYGYH6j0oGh+01EUQO+XYcoNog Gxn1kwPX8vuTYXj07U9egs1fuIsY+cE7IflHEIMYgi6YIvOd61ROJifw2e2qX/bLQ8Ph MVqYjogd4X6Nr41KUpdvH8ay4KmtUju9+HWDvhAH4Cld9AArLzN5kvL5k9xozwNcH8oa gY+7d3DSeiqzF/xoUW8oHoz8hEXGUCqEifwChYMA4DRhWvz/qAV8DVM65BI/qNW3Idxn JYbg== X-Forwarded-Encrypted: i=1; AHgh+RqPqj+CgQBFMIrAtQb6ntS0iAVeIh+n51ULSnaHLI5mkqUTtk9cyLN1q1VAtbIYfz03Ld8O23prkPMMGEE=@vger.kernel.org X-Gm-Message-State: AOJu0Yxvlg373B1oxU1rRnKGKNGUJUoCGoO31jOytOQr7JRcq+v03Z+c zB7K639LmBSrz2WKj+Dq+BaExoaF2LayFsvkhx4oo+cIiOXYPSEQvZ9PozwP9k1R5CI61ShXD8o Ra36T+F9chOhEVi7ykvXOv5RtMFhyK0Wf+SVCAYTdGwU2RXPnRd3ZqfX36Vc= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1905:b0:6aa:e524:fd7f with SMTP id 006d021491bc7-6ae970b941bmr20619107eaf.34.1786322068574; 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.3a0d52.009a.GAE@google.com> Subject: [syzbot] [btrfs?] WARNING in __add_block_group_free_space 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: 06cf61899d64 Merge tag 'x86-urgent-2026-08-08' of git://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15b27fb9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a59830cba91a1981 dashboard link: https://syzkaller.appspot.com/bug?extid=6931616d57696102d8aa compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-06cf6189.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2c3ef8ca53e1/vmlinux-06cf6189.xz kernel image: https://storage.googleapis.com/syzbot-assets/52ac12d71a9c/bzImage-06cf6189.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6931616d57696102d8aa@syzkaller.appspotmail.com ------------[ cut here ]------------ btrfs_abort_should_print_stack(__error) WARNING: fs/btrfs/free-space-tree.c:1440 at __add_block_group_free_space+0x5a3/0x5b0 fs/btrfs/free-space-tree.c:1440, CPU#0: kworker/u4:3/41 Modules linked in: CPU: 0 UID: 0 PID: 41 Comm: kworker/u4:3 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: events_unbound btrfs_async_reclaim_metadata_space RIP: 0010:__add_block_group_free_space+0x5a3/0x5b0 fs/btrfs/free-space-tree.c:1440 Code: 07 38 c1 0f 8c ce fc ff ff 4c 89 f7 e8 76 bc 00 fe e9 c1 fc ff ff e8 1c 87 91 fd eb 10 e8 15 87 91 fd eb 09 e8 0e 87 91 fd 90 <0f> 0b 90 44 89 e1 f7 d9 e9 51 fe ff ff 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc900004374b8 EFLAGS: 00010293 RAX: ffffffff84358aa2 RBX: ffff888051eb8001 RCX: ffff88801ae58000 RDX: 0000000000000000 RSI: ffffffff8f1f5b20 RDI: 00000000ffffffe4 RBP: ffff888042b61490 R08: ffff88801ae58000 R09: 0000000000000003 R10: 00000000fffffffb R11: 0000000000000000 R12: 00000000ffffffe4 R13: ffff8880435d3790 R14: ffff888042b614f0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88808c549000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055b6397df5f8 CR3: 00000000407ef000 CR4: 0000000000352ef0 Call Trace: btrfs_add_block_group_free_space+0xd0/0x130 fs/btrfs/free-space-tree.c:1465 btrfs_create_pending_block_groups+0xcc6/0x15e0 fs/btrfs/block-group.c:2952 __btrfs_end_transaction+0x140/0x640 fs/btrfs/transaction.c:1092 flush_space+0x3e9/0xde0 fs/btrfs/space-info.c:912 do_async_reclaim_metadata_space+0x3e8/0x940 fs/btrfs/space-info.c:1211 btrfs_async_reclaim_metadata_space+0x89/0xe0 fs/btrfs/space-info.c:1278 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 --- 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