Nix develop segmentation fault evaluating derivation for devShells.x86_64-linux.default

[rbmdotdev]

Summary

@zeme-iohk pinging you as per the request in the nix-shell deprecation message

I checked out pltuus:master and ran nix-shell, saw the deprecation message and switched to nix develop and got the following error:

evaluating derivation 'git+file:///home/mark/workspace/cardano/plutus#devShells.x86_64-linux.default'[1] 471603 segmentation fault nix develop

nix-shell seems to work fine however I think this relates to an issue I was experiencing this morning when trying to spin up plutip:

mlabs-haskell/plutip#147

with plutip my shell / session just seemed to crash. it doesn't crash when running in this repo

I also had the same problem today with the pluts-apps repo and the latest 1.0.0-alpha tag when running nix-shell which caused my session to crash. if I checkout the 0.1.0 tag in that project nix-shell works fine

I am running Arch Linux in Windows Subsystem for linux and nix 2.11 however I can reproduce in debian running on bare metal also so I do not think it is specific to my Arch and WSL setup

If you need anymore info let me know and I would love a workaround to get unblocked if it is not a quick fix

thanks

Steps to reproduce the behavior

checkout master
run nix develop from shell

Actual Result

evaluating derivation 'git+file:///home/mark/workspace/cardano/plutus#devShells.x86_64-linux.default'[1] 471603 segmentation fault nix develop

Expected Result

nix develop to complete successfully

Describe the approach you would take to fix this

no idea

System info

I am running Arch Linux in Windows Subsystem for linux and nix 2.11 however I can reproduce in debian running on bare metal also so I do not think it is specific to my Arch and WSL setup

[zeme-iohk]

Is it nix develop that's segfaulting or nix build .#haskell-language-server or both?
Can you also try nix build .#haskell-language-server if you haven't already?

[rbmdotdev]

nix build .#haskell-language-server

executes successfully

edit: and thank you so much for the prompt reply

[zeme-iohk]

oh dead, super weird that one would work and not the other...
Can you try nix develop a couple more times?
I've have segfaults disappear by doing that.
Still worth investigating ofc, but do try and see if that works please

[rbmdotdev]

running about 10 times with no change, will keep trying intermittently over the course of the evening but as I can reproduce across different projects and different machines I am not super optimistic unfortunately

thanks again

[zeme-iohk]

I also had the same problem today with the pluts-apps repo and the latest 1.0.0-alpha tag when running nix-shell which caused my session to crash.

You mean this? https://github.com/input-output-hk/plutus-apps/tree/v1.0.0-alpha1
doing nix-shell there also segfaults?
Does nix-shell in plutus-apps master also segfaults?

What other projects are you having problems with?
Unfortunately I can't easily replicate your error as I'm on darwin.

[rbmdotdev]

You mean this? https://github.com/input-output-hk/plutus-apps/tree/v1.0.0-alpha1 doing nix-shell there also segfaults?

yes that tag of plutus-apps but I don't get the same printed error as shown above, see screenshot and see segv error on right side of command prompt

Does nix-shell in plutus-apps master also segfaults?

Actually no I just tried it and nix-shell on plutus-apps master succeeds

What other projects are you having problems with?
plutip:

mlabs-haskell/plutip#147

it crashes in a more severe way than plutus or plutus-apps in that it kills my whole user session. it crashes whether I use nix-shell or nix develop in plutip

[zeme-iohk]

Ok. I've had nix segfaults disappear before by upgrading nixpkgs. I'll try that. Which is more urgent to you now, plutus or plutus-apps?

[rbmdotdev]

plutus-apps please and thank you

[zeme-iohk]

Wait but you need plutus-apps 1.0.0-alpha to work?
Even if master works?

[rbmdotdev]

sorry you are right, as long as master is stable enough to work on I am fine to use that for now.

[zeme-iohk]

Thank you, I'll look into fixing plutus master then

[zeme-iohk]

Are you sure you are running the latest nix? version 2.11.1?
Can I ask you to upgrade?
Also are you on the IOHK slack? What's your handle?

[rbmdotdev]

I am not in the slack but would love to join if I am able! I am in the iog technical discord.

also I fetched latest plutus master and ran nix develop just now with no other changes and it worked.........sooooo did you do anything or it just fixed itself like you suspected it might?

[zeme-iohk]

A few commits have been merged today, but nothing to address your problem specifically.
I've had non-deterministic segfaults in nix before, which I've fixed by bashing the Enter key until they were gone.
So I think it fixed itself.
I'll keep this issue open for some time in case the problem reappears on your end.
I was gonna ask for your slack so that we could work on this together as there is no way for me currently to replicate your setup.
What's the discord link?

[rbmdotdev]

Is the slack public? I will happily join if so

just in case it helps the following chain of events just occurred:

I ran nix-store --gc to free up some space
plutus-apps main nix-shell now seg faulted
plutus main nix develop worked correctly
plutus-apps main nix-shell still seg faulted
checked out plutus-apps tags/v0.1.0
nix-shell succeeds
checked out plutus-apps main
nix-shell succeeds
checked out nix-shell tags/v1.0.0-alpha1
nix-shell seg faults

I am good to go on my side for now though, thank you for the help.

[effectfully]

@rbmdotdev do you still experience this issue?

[effectfully]

(sorry about the labels and the (deleted) comment noise, I stupidly confused this ticket with another one)

[effectfully]

This ticket is really old, it talks about nix-shell and it's been a while since we introduced nix develop and changed a lot of things at that moment, plus the reproducer mentions plutus-apps. For these reasons I'm inclined to close it, so doing that.