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CI for commit 8794567 ("Make default pixi env lean") crashed on ubuntu-latest with a consistent abort inside libKGENCompilerRTShared.so at test_value.mojo startup (macOS-14 stayed green): #0 libKGENCompilerRTShared.so+0x6dc0b #1 libKGENCompilerRTShared.so+0x6ade6 #2 libKGENCompilerRTShared.so+0x6e8b7 #3 libc.so.6+0x45330 (raise) mojo: error: execution crashed Root cause: the earlier commit pulled sysroot_linux-64 >= 2.34 into the default env for `mojo build`. Recent conda-forge gxx builds now select sysroot 2.39 as the preferred candidate, and 2.39 destabilises Mojo's JIT runtime on GitHub's ubuntu-latest image. The prior green CI (commit 6998d84) had sysroot 2.28 transitively via an older gxx revision. Fix in two parts: 1. Pin sysroot_linux-64 = "2.34.*" explicitly in the base [target.linux-64.dependencies]. 2.34 is the oldest conda-forge sysroot that exposes the glibc 2.34 symbols Mojo's shared libs reference, while staying below 2.39's JIT-unstable zone. 2. Move tasks that actually call `mojo build` (build-bench-cpu, build-bench-gpu, build-bench-simdjson) and their downstream bench-* consumers (bench-cpu, bench-gpu, bench-gpu-all, bench-gpu-cujson) into [feature.dev.tasks]. Those tasks want the full dev toolchain (`make`, a stable `git` for cuJSON cloning, etc.) and are not run by the `tests-cpu`/`tests-gpu` CI path. Default env stays lean; users run benchmarks with `pixi run -e dev bench-gpu ...`. Also move `make` into [feature.dev.dependencies] since nothing in the default-env task set invokes Make. Verified locally on Linux: - default env: pixi install pulls sysroot 2.34, mojo 0.26.3.0.dev2026041805, simdjson 4.6.2. `pixi run tests-cpu` passes 186 tests, 0 failed. - dev env: `pixi run -e dev build-bench-gpu` builds without glibc link errors. `pixi run -e dev bench-gpu` runs the 4-row Bench report. Made-with: Cursor Co-authored-by: Cursor <cursoragent@cursor.com>
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DO NOT MERGE. Debug branch to reproduce and isolate the Linux x86_64 crash when pinning mojo to 0.26.3.0.dev2026041520.
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