[ndgrigorian]

This PR reverts gh-2411, which bumped oclcpuexp to 2026-WW42 and broke the OS compiler workflow

The workflow passed on gh-2411 only because the run restored the previous sycl bundle cache and kept using the old CPU runtime (rm -rf oclcpuexp failed silently and the new tarball was never extracted). Every run since installed the new runtime and aborts at exit with

python: /__w/llvm/llvm/src/unified-runtime/source/adapters/opencl/device.hpp:51: ur::opencl::ur_device_handle_t_::~ur_device_handle_t_(): Assertion `Res == CL_SUCCESS' failed.

The abort comes from libsycl releasing cached sub-devices in its own destructor. When a library depending on libsycl is loaded after SYCL starts up, libsycl's destructor runs after the CPU runtime's, and the new runtime returns CL_INVALID_OPERATION from clReleaseDevice. This has been reproduced in SYCL.

Additionally fixes the workflow so that a pin change replaces the cached oclcpuexp and oneTBB installs, and fails if it can't

• Have you provided a meaningful PR description?
• Have you added a test, reproducer or referred to an issue with a reproducer?
• Have you tested your changes locally for CPU and GPU devices?
• Have you made sure that new changes do not introduce compiler warnings?
• Have you checked performance impact of proposed changes?
• Have you added documentation for your changes, if necessary?
• Have you added your changes to the changelog?
• If this PR is a work in progress, are you opening the PR as a draft?

[github-actions]

Deleted rendered PR docs from intelpython.github.com/dpctl, latest should be updated shortly. 🤞

[coveralls]

coverage: 74.893%. remained the same — revert-gh-2411 into master

[Copilot]

🟢 Approval recommended

No active review issues block the dependency rollback and workflow-hardening changes.

No open issues 🎉

What changed in this PR

Reverts the SYCL dependency update from gh-2411 to avoid the reported CPU runtime shutdown crash, and hardens dependency replacement in the OS compiler workflow.

Changes:

• Rolls back oclcpuexp to 2026-WW28 and oneTBB to 2023.1.0.
• Restores write permissions before removing cached dependency installs.
• Makes removal, extraction, and OpenCL library copy failures stop the workflow.

File	Description
.github/​workflows/​os-llvm-sycl-build.yml	Hardens cached dependency cleanup and installation error handling.
.github/​sycl-build-deps.env	Restores the previous oclcpuexp and oneTBB pins.

_{Review effort: Balanced}

[antonwolfy]

LGTM