# Nextflow process hangs with no error message

**URL:** <https://community.seqera.io/t/nextflow-process-hangs-with-no-error-message/1718>\
**Category:** Ask for help\
**Tags:** nextflow\
**Created:** [February 7, 2025, 11:44am UTC](https://community.seqera.io/t/nextflow-process-hangs-with-no-error-message/1718 "2025-02-07T11:44:13Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Monica\_Della\_Rosa](https://dub1.discourse-cdn.com/flex013/user_avatar/community.seqera.io/monica_della_rosa/32/1430_2.png) [@Monica\_Della\_Rosa](https://community.seqera.io/u/Monica_Della_Rosa)\
**Post date:** [February 7, 2025, 11:44am UTC](https://community.seqera.io/t/nextflow-process-hangs-with-no-error-message/1718/1 "2025-02-07T11:44:13Z")

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Hi,  
I was hoping a could use some help to solve an issue I’m facing while running a Nextflow workflow. I’m running **Trim Galore** within the workflow, and the process consistently freezes when the logs indicate:

> _“xxx,xxx,xxx reads processed”_

(The number of reads processed varies each time.) However, it doesn’t throw any errors or stop running—unless I manually terminate it. The `.nextflow.log` still shows the process as **“RUNNING”** , but no further progress occurs. We’re currently transitioning to a new job scheduler, so at the moment, the job is being run as a foreground process, within a `screen` session. Additionally, to add to the confusion, the workflow ran successfully to completion on 12 samples, but started “hanging” when I scaled up to 25 samples.

Has anyone encountered similar behavior in Nextflow? Any insights on what might be causing this or how to troubleshoot it?  
Thanks in advance for your help!

Monica

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<div class="post-metadata">

**Author:** ![mribeirodantas](https://dub1.discourse-cdn.com/flex013/user_avatar/community.seqera.io/mribeirodantas/32/235_2.png) [@mribeirodantas](https://community.seqera.io/u/mribeirodantas)\
**Post date:** [February 9, 2025, 7:31pm UTC](https://community.seqera.io/t/nextflow-process-hangs-with-no-error-message/1718/2 "2025-02-09T19:31:38Z")

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Hello @Monica_Della_Rosa ! Welcome to the Community Forum 🙂

Can you share a minimal reproducible example? It’s very hard to investigate possible causes without that. Make sure to attach the command line you’re typing, the Nextflow version, compute environment (cloud? HPC? local?) and the `.nextflow.log` file.