Resume Marker — 2026-08-21 (kernel Rust build: IRQ lifetime fixes + ready for compile)

Context

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).

What was done this session

1. Kernel Rust build: IRQ lifetime errors fixed

File changed: rust/kernel/irq/request.rs

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.

Fixes applied (4 total):

Function	Line	Change
`handle_irq_callback`	264	`T: Handler` → `T: Handler + 'static`
`handle_threaded_irq_callback`	483	`T: ThreadedHandler` → `T: ThreadedHandler + 'static`
`thread_fn_callback`	499	`T: ThreadedHandler` → `T: ThreadedHandler + 'static`

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.

Verification: python3 /tmp/hermes-verify-kernel-rust-build.py — 16/16 checks passed:

Source file checks: all 3 fixed signatures present, no old patterns remain
Build: make rust/core.o exit 0, no E0310 errors, no "error: aborting"
Object file: 344,464 bytes at rust/core.o
Only 2 pre-existing warnings (unused import flags::*, unused feature used_with_arg)

2. ./check gate — ALL CHECKS PASSED

./check → ALL CHECKS PASSED  (run: ./check mount | bench | stress | daemon for those stages)

fmt clean, 223 tests, clippy -D clean. No regressions from the IRQ fix.

3. Build config (carried over from prior session, still valid)

Nightly rustc 1.100.0 (rustup default nightly)
scripts/target.json: rustc-abi: softfloat (patched from x86-softfloat in prior session — rustc 1.100 rejects x86-softfloat)
-Zunstable-options added to rust/Makefile:559 (rustc_library rule)
CONFIG_RUST=y, CONFIG_RUSTC_VERSION=110000 in .config
rust-src component installed for nightly toolchain
generate_rust_target.rs patched to emit softfloat (not x86-softfloat)

What remains for tomorrow

Kernel compile (heavy — ask before launching)

Command: cd /home/CUBELinux/CUBELinux-2/src/CUBELinux-build && make -j4 bzImage modules
- Use -j4 not -j8 — 7.4 GB RAM, only 3.7 GB free; rustc is memory-hungry, -j8 risks swapping
Expected time (incremental, current state with 28,447 .o files already present): ~5–15 minutes
If clean build needed: 45–90 minutes on this hardware (Intel i5-1035G4, 4c/8t, 1.1 GHz base, NVMe)
After build: install modules, update GRUB, reboot into new kernel

GRUB

New kernel entry: LOCALVERSION=-cube (already in .config)
Verify LOCALVERSION=-ipu4p entry still works (camera kernel, currently active)

Post-boot verification

Cube filesystem mount
Daemon startup
Camera (ipu4) if desired

Xfce (separate track — not touched this session)

dpkg state clean: lightdm, light-locker, task-xfce-desktop all removed/purged
Xfce 4.20.2 intact: xfce4-session, xfce4-panel, xfce4-goodies all ii
Session files: /usr/share/xsessions/xfce.desktop, /usr/share/wayland-sessions/xfce-wayland.desktop
GDM active, default DM /usr/sbin/gdm3
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.

Files

Workspace: /home/CUBELinux/CUBELinux-2/
Changed file: src/CUBELinux-build/rust/kernel/irq/request.rs
Canonical gate: ./check (run from workspace root)
Build dir: src/CUBELinux-build/
Kernel .config: src/CUBELinux-build/.config (CONFIG_RUST=y, CONFIG_LOCALVERSION="-cube")
Rust target.json: src/CUBELinux-build/scripts/target.json (rustc-abi: softfloat)
System daemon socket: /run/cube/cube.sock
luulu session daemon socket: /run/user/1000/cube/cube.sock
Verification script used: /tmp/hermes-verify-kernel-rust-build.py (cleaned up after run)

Git state

Branch feat/os-kernel-in-cube, working tree clean (verify with git status before committing)
Prior commits on HEAD: c090233 (bench fix), ae1a62a (docs), 3f007a1 (bench saturating_sub) + 3 older commits

Reminder

User explicitly does NOT want auto-launching heavy kernel compiles while they're using the machine
make -j8 saturates all 8 cores + memory on this Surface Pro 7 (i5-1035G4, 7.4 GB RAM)
Must get user go before launching the kernel compile tomorrow

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