CUBELinux-2: WordFlags/tri-channel 16-bit flag field, tag-14 + scan_by_word_flag, cubetrace capture→replay→golden→lineage, CUBE VP-tree balling index (cubecode::ballindex), cubefs-visible WordFlags, and cube-mvw (sharded multi-writer MVCC store with per-shard WALs + group-commit + compaction, impl CubeBackend => CubeStore<MvwBackend> DB). Adds show-flags/scan-word-flags/trace-*/golden-capture CLI; ~ tests green.
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CUBELinux-2
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# Resume Marker — 2026-08-21 (kernel Rust build: IRQ lifetime fixes + ready for compile)
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## Context
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The session after RESUME-20260820. Fixed the kernel Rust build errors and verified `make rust/core.o` compiles cleanly. Heavy kernel compile not started (per user directive — will run tomorrow with explicit go).
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---
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## What was done this session
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### 1. Kernel Rust build: IRQ lifetime errors fixed
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**File changed:** `rust/kernel/irq/request.rs`
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**Root cause:** `rust/core.o` failed with 3× `E0310: the parameter type T may not live long enough` errors. The extern "C" IRQ callback functions were missing `+ 'static` lifetime bounds on their generic `T` parameters.
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**Fixes applied (4 total):**
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| Function | Line | Change |
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|----------|------|--------|
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| `handle_irq_callback` | 264 | `T: Handler` → `T: Handler + 'static` |
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| `handle_threaded_irq_callback` | 483 | `T: ThreadedHandler` → `T: ThreadedHandler + 'static` |
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| `thread_fn_callback` | 499 | `T: ThreadedHandler` → `T: ThreadedHandler + 'static` |
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The `impl` blocks already had `T: Handler + 'static` and `T: ThreadedHandler + 'static` on lines 185, 198, 403, 416 — the three extern C callback functions and their callers were the missing ones.
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**Verification:** `python3 /tmp/hermes-verify-kernel-rust-build.py` — 16/16 checks passed:
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- Source file checks: all 3 fixed signatures present, no old patterns remain
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- Build: `make rust/core.o` exit 0, no E0310 errors, no "error: aborting"
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- Object file: 344,464 bytes at `rust/core.o`
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- Only 2 pre-existing warnings (unused import `flags::*`, unused feature `used_with_arg`)
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### 2. ./check gate — ALL CHECKS PASSED
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```
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./check → ALL CHECKS PASSED (run: ./check mount | bench | stress | daemon for those stages)
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```
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fmt clean, 223 tests, clippy -D clean. No regressions from the IRQ fix.
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### 3. Build config (carried over from prior session, still valid)
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- Nightly rustc 1.100.0 (`rustup default nightly`)
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- `scripts/target.json`: `rustc-abi: softfloat` (patched from `x86-softfloat` in prior session — rustc 1.100 rejects `x86-softfloat`)
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- `-Zunstable-options` added to `rust/Makefile:559` (rustc_library rule)
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- `CONFIG_RUST=y`, `CONFIG_RUSTC_VERSION=110000` in `.config`
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- `rust-src` component installed for nightly toolchain
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- `generate_rust_target.rs` patched to emit `softfloat` (not `x86-softfloat`)
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---
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## What remains for tomorrow
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### Kernel compile (heavy — ask before launching)
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- Command: `cd /home/CUBELinux/CUBELinux-2/src/CUBELinux-build && make -j4 bzImage modules`
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- Use `-j4` not `-j8` — 7.4 GB RAM, only 3.7 GB free; rustc is memory-hungry, -j8 risks swapping
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- Expected time (incremental, current state with 28,447 .o files already present): **~5–15 minutes**
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- If clean build needed: **45–90 minutes** on this hardware (Intel i5-1035G4, 4c/8t, 1.1 GHz base, NVMe)
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- After build: install modules, update GRUB, reboot into new kernel
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### GRUB
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- New kernel entry: `LOCALVERSION=-cube` (already in .config)
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- Verify `LOCALVERSION=-ipu4p` entry still works (camera kernel, currently active)
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### Post-boot verification
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- Cube filesystem mount
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- Daemon startup
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- Camera (ipu4) if desired
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---
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## Xfce (separate track — not touched this session)
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- dpkg state clean: lightdm, light-locker, task-xfce-desktop all removed/purged
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- Xfce 4.20.2 intact: `xfce4-session`, `xfce4-panel`, `xfce4-goodies` all `ii`
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- Session files: `/usr/share/xsessions/xfce.desktop`, `/usr/share/wayland-sessions/xfce-wayland.desktop`
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- GDM active, default DM `/usr/sbin/gdm3`
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- Issue reported (external monitor oversized, both monitors showing in Xfce vs GNOME's correct single monitor): root cause is `xfsettingsd` not running during Xfce session — Xfce inherits GNOME's RandR state without managing it. The fix is ensuring `xfsettingsd` starts (autostart entry at `/etc/xdg/autostart/xfsettingsd.desktop` exists, not disabled). No action taken — user will test after reboot.
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---
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## Files
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- Workspace: `/home/CUBELinux/CUBELinux-2/`
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- Changed file: `src/CUBELinux-build/rust/kernel/irq/request.rs`
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- Canonical gate: `./check` (run from workspace root)
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- Build dir: `src/CUBELinux-build/`
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- Kernel .config: `src/CUBELinux-build/.config` (CONFIG_RUST=y, CONFIG_LOCALVERSION="-cube")
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- Rust target.json: `src/CUBELinux-build/scripts/target.json` (rustc-abi: softfloat)
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- System daemon socket: `/run/cube/cube.sock`
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- luulu session daemon socket: `/run/user/1000/cube/cube.sock`
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- Verification script used: `/tmp/hermes-verify-kernel-rust-build.py` (cleaned up after run)
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## Git state
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- Branch `feat/os-kernel-in-cube`, working tree clean (verify with `git status` before committing)
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- Prior commits on HEAD: `c090233` (bench fix), `ae1a62a` (docs), `3f007a1` (bench saturating_sub) + 3 older commits
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---
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## Reminder
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- User explicitly does NOT want auto-launching heavy kernel compiles while they're using the machine
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- `make -j8` saturates all 8 cores + memory on this Surface Pro 7 (i5-1035G4, 7.4 GB RAM)
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- Must get user go before launching the kernel compile tomorrow
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