Panic on ~main~ `second_new_tranching_approach` in this model

[ahawkes]

Describe the bug

This model panics halfway through the simulation. The model is very similar to simple_modified, just has higher capex costs for one process. Output I see

simple_modified_withpanic.zip

is:

root@4c09da989d89:/workspaces/MUSE_2.0# cargo run run examples/simple_modified --overwrite --debug-model
Compiling muse2 v2.1.0 (/workspaces/MUSE_2.0)
Finished dev profile [unoptimized + debuginfo] target(s) in 22.01s
Running target/debug/muse2 run examples/simple_modified --overwrite --debug-model
[14:27:02 INFO muse2::cli] Starting MUSE2 v2.1.0
[14:27:02 WARN muse2::model::parameters] !!! You've enabled the please_give_me_broken_results option. !!!
I see you like to live dangerously 😈. This option should ONLY be used by developers as it can cause peculiar behaviour that breaks things. NEVER enable it for results you actually care about or want to publish. You have been warned!
[14:27:02 INFO muse2::cli] Loaded model from /workspaces/MUSE_2.0/examples/simple_modified
[14:27:02 INFO muse2::cli] Output folder: muse2_results/simple_modified
[14:27:02 WARN muse2::cli] Output folder will be overwritten
[14:27:02 INFO muse2::simulation] Milestone year: 2020
[14:27:02 INFO muse2::simulation] Running dispatch optimisation...
[14:27:02 INFO muse2::simulation] Milestone year: 2021
[14:27:02 INFO muse2::simulation] Running agent investment...
[14:27:02 INFO muse2::simulation] Running dispatch optimisation...
[14:27:02 INFO muse2::simulation] Max ironing out iterations (1) reached
[14:27:02 INFO muse2::simulation] Running final dispatch optimisation for year 2021...
[14:27:02 INFO muse2::simulation] Milestone year: 2022
[14:27:02 INFO muse2::simulation] Running agent investment...
[14:27:03 INFO muse2::simulation] Running dispatch optimisation...
[14:27:03 INFO muse2::simulation] Max ironing out iterations (1) reached
[14:27:03 INFO muse2::simulation] Running final dispatch optimisation for year 2022...
[14:27:03 INFO muse2::simulation] Milestone year: 2023
[14:27:03 INFO muse2::simulation] Running agent investment...
[14:27:03 INFO muse2::simulation] Running dispatch optimisation...
[14:27:03 INFO muse2::simulation] Max ironing out iterations (1) reached
[14:27:03 INFO muse2::simulation] Running final dispatch optimisation for year 2023...
[14:27:03 INFO muse2::simulation] Milestone year: 2024
[14:27:03 INFO muse2::simulation] Running agent investment...
[14:27:03 INFO muse2::simulation] Running dispatch optimisation...
[14:27:03 INFO muse2::simulation] Max ironing out iterations (1) reached
[14:27:03 INFO muse2::simulation] Running final dispatch optimisation for year 2024...
[14:27:03 INFO muse2::simulation] Milestone year: 2025
[14:27:03 INFO muse2::simulation] Running agent investment...
[14:27:03 INFO muse2::simulation] Running dispatch optimisation...
[14:27:03 INFO muse2::simulation] Max ironing out iterations (1) reached
[14:27:03 INFO muse2::simulation] Running final dispatch optimisation for year 2025...
[14:27:03 INFO muse2::simulation] Milestone year: 2026
[14:27:03 INFO muse2::simulation] Running agent investment...
[14:27:04 INFO muse2::simulation] Running dispatch optimisation...
[14:27:04 INFO muse2::simulation] Max ironing out iterations (1) reached
[14:27:04 INFO muse2::simulation] Running final dispatch optimisation for year 2026...
[14:27:04 INFO muse2::simulation] Milestone year: 2027
[14:27:04 INFO muse2::simulation] Running agent investment...
[14:27:04 INFO muse2::simulation] Running dispatch optimisation...
[14:27:04 INFO muse2::simulation] Max ironing out iterations (1) reached
[14:27:04 INFO muse2::simulation] Running final dispatch optimisation for year 2027...
[14:27:04 INFO muse2::simulation] Milestone year: 2028
[14:27:04 INFO muse2::simulation] Running agent investment...

thread 'main' (147140) panicked at /rustc/31fca3adb283cc9dfd56b49cdee9a96eb9c96ffd/library/core/src/slice/sort/shared/smallsort.rs:860:5:
user-provided comparison function does not correctly implement a total order
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace

To Reproduce

Run the attached model.

Expected behavior

A clearly described error, or handling whatever is going on here.

[tsmbland]

Hi @ahawkes, I'm not getting this panic when I run it on my machine. For me, it runs until 2038, then gives the same error as #1401

Could you double check you're using the latest version of main, then send the full results folder, which should help me figure out what's going on

[ahawkes]

No sorry this is actually on second_new_tranching_approach I guess not really a bug then! But anyway worth a look?

…

________________________________ From: Tom Bland ***@***.***> Sent: 08 July 2026 15:57 To: EnergySystemsModellingLab/MUSE2 ***@***.***> Cc: Hawkes, Adam D ***@***.***>; Mention ***@***.***> Subject: Re: [EnergySystemsModellingLab/MUSE2] Panic on main in this model (Issue #1402) CAUTION: This message came from outside Imperial. Do not click links or open attachments unless you recognise the sender and were expecting this email. [https://avatars.githubusercontent.com/u/23723407?s=20&v=4]tsmbland left a comment (EnergySystemsModellingLab/MUSE2#1402)<#1402 (comment)> Hi @ahawkes<https://github.com/ahawkes>, I'm not getting this panic when I run it on my machine. For me, it runs until 2038, then gives the same error as #1401<#1401> Could you double check you're using the latest version of main, then send the full results folder, which should help me figure out what's going on — Reply to this email directly, view it on GitHub<#1402?email_source=notifications&email_token=AC37JLLQCLHXS3IGFQQS7F35DZOMVA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTIOJRGYYTENRXGQ4KM4TFMFZW63VHNVSW45DJN5XKKZLWMVXHJLDGN5XXIZLSL5RWY2LDNM#issuecomment-4916126748>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AC37JLMLYBBO6AQAULO2CT35DZOMVAVCNFSNUABFKJSXA33TNF2G64TZHM3TSMBYGA4TIOJTHNEXG43VMU5TIOBTHA2DKNZYGUZ2C5QC>. You are receiving this because you were mentioned.Message ID: ***@***.***>

[tsmbland]

@ahawkes Still not panicking for me on second_new_tranching_approach...