Enzyme crashes Julia kernel on very simple example

[mrarat]

The code below crashes the julia kernel, when jacobian function is executed:

using Enzyme

foo12(x, y) = x .+ y .+ 1.0

x = [2.0, 3.0]
y = [4.0, 1.0]

Enzyme.jacobian(Forward, foo12, x, y)

I am using VS Code an I get the following message after terminal crashes:

The terminal process "julia.exe '-i', '--banner=no', '--project=c:\Code\JuliaTest', 'c:\Users\<YourUser>\.vscode\extensions\julialang.language-julia-1.140.2\scripts\terminalserver\terminalserver.jl', '\\.\pipe\vsc-jl-repl-74dc23b7-b24e-4743-bab1-88300ecaf830', '\\.\pipe\vsc-jl-repldbg-7292e86f-ca64-4e98-95ff-e66433f33b21', '\\.\pipe\vsc-jl-cr-7a5b9c5c-f783-47d8-b737-fc079d9985d0', 'USE_REVISE=true', 'USE_PLOTPANE=true', 'USE_PROGRESS=true', 'ENABLE_SHELL_INTEGRATION=true', 'DEBUG_MODE=false'" terminated with exit code: -1073741819.

VS Code version and OS:

Version: 1.100.2 (user setup)
Commit: 848b80aeb52026648a8ff9f7c45a9b0a80641e2e
Date: 2025-05-14T21:47:40.416Z
Electron: 34.5.1
ElectronBuildId: 11369351
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Windows_NT x64 10.0.19045

Julia and Enzyme version:

(JuliaTest) pkg> st
Status `C:\Code\JuliaTest\Project.toml`
  [7da242da] Enzyme v0.13.46

julia> versioninfo()
Julia Version 1.11.4
Commit 8561cc3d68 (2025-03-10 11:36 UTC)  
Build Info:
  Official https://julialang.org/ release 
Platform Info:
  OS: Windows (x86_64-w64-mingw32)        
  CPU: 14 × Intel(R) Core(TM) Ultra 7 165U
  WORD_SIZE: 64
  LLVM: libLLVM-16.0.6 (ORCJIT, alderlake)
Threads: 1 default, 0 interactive, 1 GC (on 14 virtual cores)
Environment:
  JULIA_EDITOR = code
  JULIA_VSCODE_REPL = 1

[mrarat]

It also crashed on two other Enzyme versions that I have tested on: Enzyme v0.13.33 and Enzyme v0.13.45

[wsmoses]

can you retry on latest enzyme? we had a recent gc fix that might resolve (and I was unable to reproduce myself)

[mrarat]

Right now, I do not have access to the machine where I found the issue. I will get back to this issue once I return in September from my summer holidays.

[wsmoses]

bumping this @mrarat

[mrarat]

The code does no longer crash the julia kernel but still results in an error:

ERROR: Generated function result with `edges == nothing` and `max_world == typemax(UInt)` must have `min_world == 1`
Stacktrace:
  [1] my_methodinstance
    @ C:\Users\user\.julia\packages\Enzyme\Ah2fT\src\utils.jl:402 [inlined]
  [2] #147
    @ C:\Users\user\.julia\packages\Enzyme\Ah2fT\src\sugar.jl:21 [inlined]
  [3] JuliaContext(f::Enzyme.var"#147#148"{Type{Vector{Float64}}}; kwargs::@Kwargs{})
    @ GPUCompiler C:\Users\user\.julia\packages\GPUCompiler\Gp8bZ\src\driver.jl:34
  [4] JuliaContext(f::Function)
    @ GPUCompiler C:\Users\user\.julia\packages\GPUCompiler\Gp8bZ\src\driver.jl:25
  [5] macro expansion
    @ C:\Users\user\.julia\packages\Enzyme\Ah2fT\src\sugar.jl:16 [inlined]
  [6] var"#s700#145"(F::Any, T::Any, ::Any, fn::Any, x::Any, startv::Any, lengthv::Any)
    @ Enzyme .\none:0
  [7] (::Core.GeneratedFunctionStub)(::UInt64, ::Method, ::Any, ::Vararg{Any})
    @ Base .\expr.jl:1694
  [8] onehot
    @ C:\Users\user\.julia\packages\Enzyme\Ah2fT\src\sugar.jl:129 [inlined]
  [9] macro expansion
    @ C:\Users\user\.julia\packages\Enzyme\Ah2fT\src\sugar.jl:457 [inlined]
 [10] create_shadows
    @ C:\Users\user\.julia\packages\Enzyme\Ah2fT\src\sugar.jl:435 [inlined]
 [11] gradient(fm::ForwardMode{…}, f::typeof(foo12), x::Vector{…}, args::Vector{…})
    @ Enzyme C:\Users\user\.julia\packages\Enzyme\Ah2fT\src\sugar.jl:585
 [12] #jacobian#162
    @ C:\Users\user\.julia\packages\Enzyme\Ah2fT\src\sugar.jl:794 [inlined]
 [13] jacobian(::ForwardMode{false, FFIABI, false, false, false}, ::Function, ::Vector{Float64}, ::Vector{Float64})
    @ Enzyme C:\Users\user\.julia\packages\Enzyme\Ah2fT\src\sugar.jl:793
 [14] top-level scope
    @ c:\Code\MWE\Enzyme_SimpleCrash\src.jl:8
Some type information was truncated. Use `show(err)` to see complete types.

julia> versioninfo()
Julia Version 1.12.1
Commit ba1e628ee4 (2025-10-17 13:02 UTC)
Build Info:
  Official https://julialang.org release
Platform Info:
  OS: Windows (x86_64-w64-mingw32)
  CPU: 14 × Intel(R) Core(TM) Ultra 7 165U
  WORD_SIZE: 64
  LLVM: libLLVM-18.1.7 (ORCJIT, alderlake)
  GC: Built with stock GC
Threads: 10 default, 1 interactive, 10 GC (on 14 virtual cores)
Environment:
  JULIA_EDITOR = code
  JULIA_VSCODE_REPL = 1
  JULIA_NUM_THREADS = 10

(Enzyme_SimpleCrash) pkg> st
Status `C:\Code\MWE\Enzyme_SimpleCrash\Project.toml`
  [7da242da] Enzyme v0.13.90

[mrarat]

@wsmoses In the meantime I have noticed another simple example from docs that errors and just made an issue for it #2696

[wsmoses]

so the error there is that we don't support 1.12 yet, which is known.

On the same julia version you were using before is this fine (there's a separate 1.12 roadmap issue)