# Particle tracer deadlock
**URL:** https://discourse.paraview.org/t/particle-tracer-deadlock/17429
**Category:** ParaView Support
**Created:** [February 5, 2026, 3:45am UTC](https://discourse.paraview.org/t/particle-tracer-deadlock/17429 "2026-02-05T03:45:03Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Kenneth\_Moreland](https://discourse.paraview.org/u/Kenneth_Moreland)
#### Post date: [February 5, 2026, 3:45am UTC](https://discourse.paraview.org/t/particle-tracer-deadlock/17429/1 "2026-02-05T03:45:03Z")
I’ve been trying to use the Particle Tracer filter in ParaView 6.0. I am in client/server running on 1 node with 8 MPI ranks. After running a few steps (5-25), pvserver deadlocks. (At least, it becomes unresponsive but the executables are still running.)
I suspect this is related to the problem reported in [Particle tracer crashing](https://discourse.paraview.org/t/particle-tracer-crashing/16786). Based on the discussion there, I tried backing out to ParaView 5.12, and it worked with no problem. However, it looks like @mwestphal’s fix for the crash for PV 6.0 is not fixing this deadlock.
Unfortunately, this dataset is too big to try to post somewhere. However, if someone has access to OLCF I can point you to the files.
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [February 5, 2026, 8:09am UTC](https://discourse.paraview.org/t/particle-tracer-deadlock/17429/2 "2026-02-05T08:09:39Z")
The issue I fixed was indeed not a deadlock but a crash, and I dont see how it would relate to deadlocking.
Also I did not specifcally test for distributed computing, apart from the existing test being run by CI using 4 cores.
So I dont doubt that there can be issues in distributed in this filter, can you try reproducing with a tay dataset you could share with me ?
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### Author:  [@Kenneth\_Moreland](https://discourse.paraview.org/u/Kenneth_Moreland)
#### Post date: [February 6, 2026, 1:12am UTC](https://discourse.paraview.org/t/particle-tracer-deadlock/17429/3 "2026-02-06T01:12:06Z")
@mwestphal I sent you an email directly with a link to download a smaller version of the data where I still see the deadlock.
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [February 6, 2026, 12:49pm UTC](https://discourse.paraview.org/t/particle-tracer-deadlock/17429/4 "2026-02-06T12:49:18Z")
I confirm the hang, please open an issue.
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### Author:  [@Kenneth\_Moreland](https://discourse.paraview.org/u/Kenneth_Moreland)
#### Post date: [February 6, 2026, 3:35pm UTC](https://discourse.paraview.org/t/particle-tracer-deadlock/17429/5 "2026-02-06T15:35:22Z")
Done: [https://gitlab.kitware.com/paraview/paraview/-/issues/23201](https://gitlab.kitware.com/paraview/paraview/-/issues/23201)