Ticket 25911 - proctrack/freebsd-reaper: Track job descendants with FreeBSD process reapers
Summary: proctrack/freebsd-reaper: Track job descendants with FreeBSD process reapers
Status: OPEN
Alias: None
Product: Slurm
Classification: Unclassified
Component: Other (show other tickets)
Version: 26.11.x
Hardware: All Other
: C - Contributions
Assignee: Tim Wickberg
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Reported: 2026-09-26 05:26 MDT by Rikka Göring
Modified: 2026-09-26 07:25 MDT (History)
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Attachments
v1 proctrack/freebsd-reaper plugin (58.67 KB, patch)
2026-09-26 05:26 MDT, Rikka Göring 		Details | Diff
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Description Rikka Göring 2026-09-26 05:26:37 MDT 
Created attachment 46325 [details]
v1 proctrack/freebsd-reaper plugin

Add proctrack/freebsd-reaper, a process-tracking plugin using FreeBSD's procctl() process-reaper APIs. The Slurm step daemon acquires reaper status, tracks descendants across process-group changes and nested reapers, and signals the tracked process tree during cleanup. Build the plugin on FreeBSD.

On the FreeBSD test node, the comparison with proctrack/pgid was:

| Test case               |  freebsd-reaper  |  pgid  |
| ----------------------- | ---------------- | ------ |
| Orphaned child          | Pass             | Pass   |
| SIGTERM-resistant child | Pass             | Pass   |
| Nested child            | Pass             | Pass   |
| setsid escape           | Pass             | Fail   |
| setpgid escape          | Pass             | Fail   |
| Double-fork escape      | Pass             | Fail   |
| Nested daemon escape    | Pass             | Fail   |

A zombie regression was also retested: the child briefly became a zombie, disappeared promptly, and the node returned to IDLE without timing out or draining.

The patches apply to master at 9f9da53b4a, and the generated configure script passes a shell syntax check.