Oscar Dowson

## Spectral functions ``` # Copied from Hypatia package # https://github.com/chriscoey/Hypatia.jl/blob/master/examples/spectral_functions_JuMP.jl #= Copyright (c) 2018-2022 Chris Coey, Lea Kapelevich, and contributors This Julia package Hypatia.jl is released under the MIT...

I haven't tried to reproduce locally, but this is a pretty bad error. Let me see if I can find a minimal example.

I can reproduce this on macOS. Working on simplifying.

```Julia (hyp) pkg> st Status `/private/tmp/hyp/Project.toml` [87dc4568] HiGHS v1.8.1 [b99e6be6] Hypatia v0.7.4 [4076af6c] JuMP v1.19.0 [2f354839] Pajarito v0.8.2 [ab19e554] PajaritoExtras v0.0.0 `https://github.com/chriscoey/PajaritoExtras.jl#main` [37e2e46d] LinearAlgebra [9a3f8284] Random (hyp) pkg> st -m...

So I caught the failing MPS file, but solving it in a new session doesn't trigger the crash. I think the problem is I'm missing the MIP start. So let...

@dhendryc perhaps in the mean time, use a different MIP solver, like Gurobi or SCIP.

I'm really struggling to create a standalone reproducer. A large part of it seems to be the iterative nature of the Pajarito solve. @jajhall is this stack trace helpful at...

Here's a different one: ``` Solution has num max sum Col infeasibilities 0 0 0 Integer infeasibilities 0 0 0 Row infeasibilities 0 0 0 Row residuals 0 0 0...

I managed to trigger this in a very unhelpful way ```Julia WARNING: Failed to solve node with all integer columns fixed. Declaring node infeasible. 547 14 234 94.56% -0.1546302467 -0.1536649524...

I don't think the `WARNING: Failed to solve node with all integer columns fixed. Declaring node infeasible.` is relevant. It didn't occur in other crashes. I guess I need to...