# Bug with solvers for stiffness in version 6.80.1 of OrdinaryDiffEq

**URL:** https://discourse.julialang.org/t/bug-with-solvers-for-stiffness-in-version-6-80-1-of-ordinarydiffeq/114990
**Category:** Specific Domains
**Tags:** differentialequation, ordinarydiffeq
**Created:** [May 31, 2024, 12:08am UTC](https://discourse.julialang.org/t/bug-with-solvers-for-stiffness-in-version-6-80-1-of-ordinarydiffeq/114990 "2024-05-31T00:08:09Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Alergy](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/alergy/32/202344_2.png) [@Alergy](https://discourse.julialang.org/u/Alergy)
#### Post date: [May 31, 2024, 12:08am UTC](https://discourse.julialang.org/t/bug-with-solvers-for-stiffness-in-version-6-80-1-of-ordinarydiffeq/114990/1 "2024-05-31T00:08:09Z")

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These days I have been using Rosenbrock23() with OrdinaryDiffEq v6.75.0 without any bugs. Recently I upgraded to OrdinaryDiffEq v6.80.1 and it just broke. Here is a MWE:

```julia
using OrdinaryDiffEq

function dudt(du, u, p, t)
    du = 3*u
end

prob = ODEProblem(dudt, [1.0], (0.0, 1.0))
sol = solve(prob, Rosenbrock23())

```

When using `Tsit5()` or `Vern7()` it does not fail. But when I use an actual method for stiff equations like `Rosenbrock23()` or `Rodas5P()`, I the following special error message:

[error.jl](https://discourse.julialang.org/uploads/short-url/2ctCU32z3KN7cXO3p02H5Lr6wS0.jl) (28.7 KB)

(i parsed the text as a .jl file, sorry about that)

---

<div class="post-metadata">

### Author: ![Oscar\_Smith](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/oscar_smith/32/25343_2.png) [@Oscar\_Smith](https://discourse.julialang.org/u/Oscar_Smith)
#### Post date: [May 31, 2024, 12:12am UTC](https://discourse.julialang.org/t/bug-with-solvers-for-stiffness-in-version-6-80-1-of-ordinarydiffeq/114990/2 "2024-05-31T00:12:49Z")

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I believe this is [ModelingToolkit takes forever to precompile on Windows 11 - #92 by ChrisRackauckas](https://discourse.julialang.org/t/modelingtoolkit-takes-forever-to-precompile-on-windows-11/114492/92). TLDR is that 1.10.0 through 1.10.3 have a compiler bug on windows that was discovered last week. 1.10.4 fixes it and will be officially released in the next day or two ([Julia 1.10.4 testing period](https://discourse.julialang.org/t/julia-1-10-4-testing-period/114958))