Disable HF Xet storage to fix CI export timeouts

[digantdesai]

HuggingFace's Xet storage backend stalls mid-download on CI runners, causing the 90-minute job timeout to fire before model weights finish downloading. Force standard HTTP downloads instead.

(from debug logs in #19352)

[pytorch-bot]

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❌ 2 New Failures, 3 Cancelled Jobs, 17 Pending, 33 Unrelated Failures

As of commit fae728a with merge base af90130 ():

NEW FAILURES - The following jobs have failed:

• Copilot code review / Prepare (gh)
  Unhandled error: HttpError: Bad credentials
• pull / test-multimodal-linux (gemma3-4b) / linux-job (gh)
  RuntimeError: Command docker exec -t 87ffaabf5d492bfef304eff9779f070de82418af9bdcd5ddaee470c06076f7a9 /exec failed with exit code 139

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• Test CUDA Builds / test-cuda-pybind (qwen3-0.6b, --quantize, Qwen-Qwen3-0.6B-cuda-quantized-int4-tile-packed) / linux-job (gh)
  ##[error]The operation was canceled.
• Test CUDA Builds / test-cuda-pybind (qwen3-0.6b, Qwen-Qwen3-0.6B-cuda-non-quantized) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / unittest-release / macos / macos-job (gh)
  ##[error]The operation was canceled.

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-lora-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-lora-multimethod-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-models-linux (ic4, portable, linux.4xlarge.memory) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-models-linux (ic4, xnnpack-quantization-delegation, linux.4xlarge.memory) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-models-linux (mobilebert, portable, linux.2xlarge) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-models-linux (mobilebert, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-models-linux (phi_4_mini, portable, linux.4xlarge.memory) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-moshi-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-phi-3-mini-runner-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-samsung-quantmodels-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-sqnr-static-llm-qnn-linux (smollm2_135m) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-vulkan-models-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest / linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest / macos / macos-job (gh) (trunk failure)
  [ FAILED ] OpGridSampler2dTest.BatchSizeMismatchDies
• pull / unittest / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  [ FAILED ] OpGridSampler2dTest.BatchSizeMismatchDies
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / test-arm-ootb-linux (run_deit_e2e_ethos_u) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / test-huggingface-transformers-xnnpack (qwen3-0.6b|xnnpack|--quantize) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / test-huggingface-transformers-xnnpack (qwen3-1.7b|xnnpack|--quantize) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / test-huggingface-transformers-xnnpack (smollm2-135m|xnnpack|--quantize) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / test-huggingface-transformers-xnnpack (smollm3-3b|xnnpack|--quantize) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (ic4, portable, linux.arm64.2xlarge) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (ic4, xnnpack-quantization-delegation, linux.arm64.2xlarge) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (mobilebert, portable, linux.arm64.2xlarge) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (mobilebert, xnnpack-quantization-delegation, linux.arm64.2xlarge) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (phi_4_mini, portable, linux.arm64.m7g.4xlarge) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (qwen2_5_1_5b, portable, linux.arm64.2xlarge) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / test-models-windows (mobilebert, portable) / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / test-models-windows (mobilebert, xnnpack-q8) / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / unittest-release / linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / unittest-release / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Forces HuggingFace Hub downloads to bypass the Xet storage backend to prevent CI stalls/timeouts when exporting model artifacts.

Changes:

• Disable HF Hub’s Xet backend via environment variable to ensure standard HTTP downloads during export.

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