unsloth/studio/backend/core
Daniel Han-Chen c4c9e2aeec Fix/adjust diffusion: round 28 P1 + P2 batch for PR #5754
Twelve actionable P1/P2 findings from round 28 reviewer aggregate.
Skipped #3 (studio.txt huggingface-hub bump) because the empirical
CI evidence in round 26 contradicts that suggestion: bumping the
pin there breaks installs that apply constraints.txt
(transformers==4.57.6 requires hub<1.0). The actual broken combo
only happens via the --no-deps no-torch path which is already
bumped in no-torch-runtime.txt and pyproject.toml huggingfacenotorch.

1. utils/datasets/llm_assist.py: split _HELPER_ADVISOR_REFCOUNT
   into CACHE vs GPU counters. helper_advisor_owns_repo (used by
   delete-cache) reads CACHE; helper_advisor_busy (used by public
   handoffs) reads GPU. precache_helper_gguf now registers with
   gpu_owner=False so a background pre-cache download does not
   503 every chat / training / export / diffusion load.

2. utils/datasets/llm_assist.py: introduce _HELPER_ADVISOR_START_LOCK
   and wrap the busy precheck + register pair in _run_with_helper
   and _run_multi_pass_advisor. Two concurrent helper / advisor
   invocations could both pass _gpu_workload_busy_for_helper before
   either registered, then OOM each other.

3. utils/datasets/llm_assist.py: _gpu_workload_busy_for_helper now
   also returns True when another helper/advisor already holds the
   private LlamaCppBackend.

4. routes/inference.py: add _raise_if_helper_advisor_busy(workload)
   that 503s when AI Assist owns the GPU. Wire it into both chat
   load branches (GGUF + safetensors) BEFORE the existing
   _release_export_for / _release_diffusion_for calls so we do not
   first tear down an idle export / diffusion just to fail on the
   helper check.

5. routes/training.py + routes/export.py + diffusion.load_model:
   call the helper-busy check FIRST before any release helper
   fires. Mirrors the chat-load ordering.

6. routes/inference.py _release_llama_for: poll
   loading_model_identifier for up to 5 s after unload_model() so a
   cancelled pending GGUF download has time to clear its
   identifier. Mirrors the same wait round 26 added to the explicit
   /api/inference/unload route.

7. core/inference/diffusion.py _release_chat_backend_for_diffusion:
   same 5 s settling wait for cancelled pending GGUF downloads.

8. models/inference.py LoadRequest: validate every llama_extra_args
   entry through _no_control_chars + _reject_embedded_hf_token.
   The list was forwarded verbatim to a logged llama-server command
   line, so a smuggled control char or hf_... token would land in
   logs and subprocess args.

9. routes/models.py /gguf-download-progress: apply
   _validate_logged_identifier to repo_id and variant, matching the
   round 24 hardening on the adjacent generic /download-progress.

10. routes/inference.py diffusion-load RuntimeError classifier:
    treat "AI Assist ..." messages as retryable 503 instead of 400
    (round 28 P2 #15). Mirrors the round 18/19 markers for chat
    unload failures.

Tests: 105 targeted + 1768 broader backend tests pass locally.
2026-05-25 14:21:37 +00:00
..
data_recipe chore(deps): bump the npm-oxc-validator group across 1 directory with 2 updates (#5667) 2026-05-22 04:46:20 -07:00
export fix: repair mlx studio base export save_method (#5727) 2026-05-25 04:04:07 -07:00
inference Fix/adjust diffusion: round 28 P1 + P2 batch for PR #5754 2026-05-25 14:21:37 +00:00
training studio: install flash-linear-attention and tilelang for Qwen3.5 family (#5434) 2026-05-18 03:49:06 -07:00
__init__.py [Studio] Show non exported models in chat UI (#4892) 2026-04-14 15:03:58 +04:00
tool_healing.py studio: extract tool-call XML parser into a reusable helper module (#5583) 2026-05-19 05:06:17 -07:00