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Enzyme.jl CI failure from cuda codegen #839

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@wsmoses

mul_kernel: Error During Test at /var/lib/buildkite-agent/builds/gpuci-3/julialang/enzyme-dot-jl/test/cuda.jl:18
--
  | Got exception outside of a @test
  | NVPTX LLVM back-end not loaded; cannot compile to PTX.
  | Stacktrace:
  | [1] error(s::String)
  | @ Base ./error.jl:35
  | [2] macro expansion
  | @ ~/.cache/julia-buildkite-plugin/depots/260b8bb4-e043-429b-b2f1-bbf9045c057a/packages/GPUCompiler/oeCPq/src/ptx.jl:343 [inlined]
  | [3] mcgen(job::GPUCompiler.CompilerJob{GPUCompiler.PTXCompilerTarget}, mod::LLVM.Module, format::LLVM.API.LLVMCodeGenFileType)
  | @ GPUCompiler ~/.cache/julia-buildkite-plugin/depots/260b8bb4-e043-429b-b2f1-bbf9045c057a/packages/GPUCompiler/oeCPq/src/utils.jl:230
  | [4] mcgen(job::GPUCompiler.CompilerJob{GPUCompiler.PTXCompilerTarget, CUDACore.CUDACompilerParams}, mod::LLVM.Module, format::LLVM.API.LLVMCodeGenFileType)
  | @ CUDACore ~/.cache/julia-buildkite-plugin/depots/260b8bb4-e043-429b-b2f1-bbf9045c057a/packages/CUDACore/eDgUR/src/compiler/compilation.jl:127
  | [5] macro expansion
  | @ ~/.cache/julia-buildkite-plugin/depots/260b8bb4-e043-429b-b2f1-bbf9045c057a/packages/GPUCompiler/oeCPq/src/driver.jl:476 [inlined]
  | [6] emit_asm(job::GPUCompiler.CompilerJob, ir::LLVM.Module, format::LLVM.API.LLVMCodeGenFileType)
  | @ GPUCompiler ~/.cache/julia-buildkite-plugin/depots/260b8bb4-e043-429b-b2f1-bbf9045c057a/packages/GPUCompiler/oeCPq/src/utils.jl:212
  | [7] compile_unhooked(output::Symbol, job::GPUCompiler.CompilerJob; kwargs::@Kwargs{})
  | @ GPUCompiler ~/.cache/julia-buildkite-plugin/depots/260b8bb4-e043-429b-b2f1-bbf9045c057a/packages/GPUCompiler/oeCPq/src/driver.jl:115
  | [8] compile_unhooked
  | @ ~/.cache/julia-buildkite-plugin/depots/260b8bb4-e043-429b-b2f1-bbf9045c057a/packages/GPUCompiler/oeCPq/src/driver.jl:80 [inlined]
  | [9] #compile#193
  | @ ~/.cache/julia-buildkite-plugin/depots/260b8bb4-e043-429b-b2f1-bbf9045c057a/packages/GPUCompiler/oeCPq/src/driver.jl:67 [inlined]
  | [10] compile(target::Symbol, job::GPUCompiler.CompilerJob)
  | @ GPUCompiler ~/.cache/julia-buildkite-plugin/depots/260b8bb4-e043-429b-b2f1-bbf9045c057a/packages/GPUCompiler/oeCPq/src/driver.jl:55
  | [11] #invoke_in_world#3
  | @ ./essentials.jl:926 [inlined]
  | [12] invoke_in_world
  | @ ./essentials.jl:923 [inlined]
  | [13] #invoke_frozen#1094
  | @ ~/.cache/julia-buildkite-plugin/depots/260b8bb4-e043-429b-b2f1-bbf9045c057a/packages/CUDACore/eDgUR/src/initialization.jl:30 [inlined]
  | [14] invoke_frozen
  | @ ~/.cache/julia-buildkite-plugin/depots/260b8bb4-e043-429b-b2f1-bbf9045c057a/packages/CUDACore/eDgUR/src/initialization.jl:26 [inlined]
  | [15] JuliaGPU/CUDA.jl#1239
  | @ ~/.cache/julia-buildkite-plugin/depots/260b8bb4-e043-429b-b2f1-bbf9045c057a/packages/CUDACore/eDgUR/src/compiler/compilation.jl:250 [inlined]
  | [16] JuliaContext(f::CUDACore.var"#1239#1242"{GPUCompiler.CompilerJob{GPUCompiler.PTXCompilerTarget, CUDACore.CUDACompilerParams}}; kwargs::@Kwargs{})
  | @ GPUCompiler ~/.cache/julia-buildkite-plugin/depots/260b8bb4-e043-429b-b2f1-bbf9045c057a/packages/GPUCompiler/oeCPq/src/driver.jl:34
  | [17] JuliaContext(f::Function)
  | @ GPUCompiler ~/.cache/julia-buildkite-plugin/depots/260b8bb4-e043-429b-b2f1-bbf9045c057a/packages/GPUCompiler/oeCPq/src/driver.jl:25
  | [18] compile(job::GPUCompiler.CompilerJob)
  | @ CUDACore ~/.cache/julia-buildkite-plugin/depots/260b8bb4-e043-429b-b2f1-bbf9045c057a/packages/CUDACore/eDgUR/src/compiler/compilation.jl:249
  | [19] actual_compilation(cache::Dict{Any, CuFunction}, src::Core.MethodInstance, world::UInt64, cfg::GPUCompiler.CompilerConfig{GPUCompiler.PTXCompilerTarget, CUDACore.CUDACompilerParams}, compiler::typeof(CUDACore.compile), linker::typeof(CUDACore.link))
  | @ GPUCompiler ~/.cache/julia-buildkite-plugin/depots/260b8bb4-e043-429b-b2f1-bbf9045c057a/packages/GPUCompiler/oeCPq/src/execution.jl:245
  | [20] cached_compilation(cache::Dict{Any, CuFunction}, src::Core.MethodInstance, cfg::GPUCompiler.CompilerConfig{GPUCompiler.PTXCompilerTarget, CUDACore.CUDACompilerParams}, compiler::Function, linker::Function)
  | @ GPUCompiler ~/.cache/julia-buildkite-plugin/depots/260b8bb4-e043-429b-b2f1-bbf9045c057a/packages/GPUCompiler/oeCPq/src/execution.jl:159
  | [21] macro expansion
  | @ ~/.cache/julia-buildkite-plugin/depots/260b8bb4-e043-429b-b2f1-bbf9045c057a/packages/CUDACore/eDgUR/src/compiler/execution.jl:378 [inlined]
  | [22] macro expansion
  | @ ./lock.jl:270 [inlined]
  | [23] cufunction(f::typeof(mul_kernel), tt::Type{Tuple{CuDeviceVector{Float32, 1}}}; kwargs::@Kwargs{})
  | @ CUDACore ~/.cache/julia-buildkite-plugin/depots/260b8bb4-e043-429b-b2f1-bbf9045c057a/packages/CUDACore/eDgUR/src/compiler/execution.jl:373
  | [24] cufunction(f::typeof(mul_kernel), tt::Type{Tuple{CuDeviceVector{Float32, 1}}})
  | @ CUDACore ~/.cache/julia-buildkite-plugin/depots/260b8bb4-e043-429b-b2f1-bbf9045c057a/packages/CUDACore/eDgUR/src/compiler/execution.jl:370
  | [25] macro expansion
  | @ ~/.cache/julia-buildkite-plugin/depots/260b8bb4-e043-429b-b2f1-bbf9045c057a/packages/CUDACore/eDgUR/src/compiler/execution.jl:113 [inlined]
  | [26] macro expansion
  | @ /var/lib/buildkite-agent/builds/gpuci-3/julialang/enzyme-dot-jl/test/cuda.jl:20 [inlined]
  | [27] macro expansion
  | @ ~/.cache/julia-buildkite-plugin/julia_installs/bin/linux/x64/1.10/julia-1.10-latest-linux-x86_64/share/julia/stdlib/v1.10/Test/src/Test.jl:1582 [inlined]
  | [28] top-level scope
  | @ /var/lib/buildkite-agent/builds/gpuci-3/julialang/enzyme-dot-jl/test/cuda.jl:19


on cuda CUDA v6.0.0 as seen in our CI just now : https://buildkite.com/julialang/enzyme-dot-jl/builds/7155#019ea884-2d15-46a7-81e9-702dd1393a40

cc @vchuravy

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