From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi2-f2.google.com (mail-oi2-f2.google.com [74.125.231.194]) (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 5181D3264C7 for ; Sat, 29 Aug 2026 07:02:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.194 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787986958; cv=none; b=jVf6z9mH7r4VGkU7t90A4UFSPjlU5Pd5BkU0y7S3S/9rXfv9BltsltrJeBs1b9Uv1oNbMi4Httn3DpbMehbnArPnJdoo5WADSGttrR8HANYxfVntCfIw4ntv2q0+ObfOOW2/H5pNk4k53dEtDZkJiczKamg8vea91f2W9wjGMP0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787986958; c=relaxed/simple; bh=kbNeXW/ICKHU30aJ/o4rsV0t4dRnuC4Lb/lKpiyyjL0=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=M8l48/A+jPt3b6TmmfSYLDSq+rZJXbnfERFYGDrbX/q9rVsKkSlppVXNA1HyhkUbfMaavX4aqQo6HekhbfloJonM3t7CKqabtI4RmgLstmSwfbqq9sABU2NSIguOOXe9pKtSGXiIjWReSPiL3CxPAKNWb2HOKBr1RgdbnQuc2os= 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=74.125.231.194 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-oi2-f2.google.com with SMTP id 46e09a7af769-7f4e9ec63a7so470211a34.1 for ; Sat, 29 Aug 2026 00:02:37 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787986956; x=1788591756; 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=DUXjaMzi5/EgJKrAoped5owNC5y56qkeKiobRo8ozcI=; b=GpMao132WIIAV1Es1GRWbC/P3tAD3zekIRok/W1hWiNeQyZkefuijhd85oGp+doupI 6UjbckyFchjP3+9WkMRTg/U4Tk4D2D7q3DXdUW+cEGV/o8tTkrBy8F73Mgxxwn8dkcgX vhydW1lvfcJX6tPTEmgYlSg70X95Lgqp7vy0EwNPoRly8rUjsSdR957CZRbwUH22n/Ok jhd4KDKOGKyHaox2zaBpx/79wZ0upXfdQKIMAKLFsNhuP9F4YB1fzJmD6N9iIH5KJdZ2 ak4vmoq91ryqooPqm3kHcnWeAi9v9xOcSNnivJBbWkO/R6QnCJhQaffjEkl1fn53SiR7 vh9w== X-Forwarded-Encrypted: i=1; AHgh+Rqooil5QowxAnZPpSAxdBFVrbBZpfkFPrnwg5LVk5u4k46ZFDAwZPZ8mueIzKV0bOX8FpH4QEvBe9ttLic=@vger.kernel.org X-Gm-Message-State: AFuF++kt9sSVmw3xTYWGjP0LxA4S9PV4TSLew5GiMRrR+QmxPjyrRqSB 7O5y9M1A/GVjXBWWzbqZz6nzdvDMqO4G5GqKasWCRsudQavLs6jBZ4F+ey0MliLDdSYrfUen5Hx yhnKQ7p5ksQ/VyJn546a1+1T60E61TILIWPQy289J2wL5Zgolq6AfBPZB140= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:6d92:b0:489:5d05:552c with SMTP id 5614622812f47-4b398352104mr14860732b6e.18.1787986956323; Sat, 29 Aug 2026 00:02:36 -0700 (PDT) Date: Sat, 29 Aug 2026 00:02:36 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a92840c.1d9ded08.62e62.0105.GAE@google.com> Subject: [syzbot] [btrfs?] WARNING in btrfs_remove_from_free_space_tree 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: 818bebeb63dd drm/xe: Don't hand out the flat CCS storage a.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16467549580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3c35c7e43de75adb dashboard link: https://syzkaller.appspot.com/bug?extid=df8b249da18c45425242 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-818bebeb.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9adea981957f/vmlinux-818bebeb.xz kernel image: https://storage.googleapis.com/syzbot-assets/6676075cd03e/bzImage-818bebeb.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+df8b249da18c45425242@syzkaller.appspotmail.com ------------[ cut here ]------------ btrfs_abort_should_print_stack(__error) WARNING: fs/btrfs/free-space-tree.c:869 at btrfs_remove_from_free_space_tree+0xbcd/0xda0 fs/btrfs/free-space-tree.c:869, CPU#0: kworker/u4:2/24 Modules linked in: CPU: 0 UID: 0 PID: 24 Comm: kworker/u4:2 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:btrfs_remove_from_free_space_tree+0xbcd/0xda0 fs/btrfs/free-space-tree.c:869 Code: e2 74 1a 41 83 ff fb 74 0d 41 83 ff f4 75 15 e8 29 c1 8c fd eb 17 e8 22 c1 8c fd eb 10 e8 1b c1 8c fd eb 09 e8 14 c1 8c fd 90 <0f> 0b 90 44 89 f9 f7 d9 49 bd 00 00 00 00 00 fc ff df e9 5d fe ff RSP: 0018:ffffc9000031ef60 EFLAGS: 00010293 RAX: ffffffff843a73ac RBX: ffff888052270001 RCX: ffff88801b7b4b00 RDX: 0000000000000000 RSI: ffffffff8f3ffd50 RDI: 00000000ffffffe4 RBP: ffffc9000031f158 R08: ffff88801b7b4b00 R09: 0000000000000003 R10: 00000000fffffffb R11: 0000000000000000 R12: 1ffff92000063df8 R13: dffffc0000000000 R14: ffff88801f5fb580 R15: 00000000ffffffe4 FS: 0000000000000000(0000) GS:ffff88808c30a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000007ff000 CR3: 000000000eb46000 CR4: 0000000000352ef0 Call Trace: alloc_reserved_extent+0x4a/0x2b0 fs/btrfs/extent-tree.c:4976 alloc_reserved_tree_block fs/btrfs/extent-tree.c:5155 [inline] run_delayed_tree_ref fs/btrfs/extent-tree.c:1815 [inline] run_one_delayed_ref fs/btrfs/extent-tree.c:1851 [inline] btrfs_run_delayed_refs_for_head fs/btrfs/extent-tree.c:2058 [inline] __btrfs_run_delayed_refs+0x18b5/0x43b0 fs/btrfs/extent-tree.c:2134 btrfs_run_delayed_refs+0xdc/0x2a0 fs/btrfs/extent-tree.c:2246 btrfs_commit_transaction+0x28a/0x30b0 fs/btrfs/transaction.c:2256 flush_space+0x28a/0xde0 fs/btrfs/space-info.c:-1 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:3387 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3470 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3551 kthread+0x38b/0x480 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