[Bug 288345] poudriere run, hanging umounts, system fails to reboot due to hanging processes

From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 20 Jul 2025 08:00:15 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288345

            Bug ID: 288345
           Summary: poudriere run, hanging umounts, system fails to reboot
                    due to hanging processes
           Product: Base System
           Version: 14.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: pi@FreeBSD.org

14.3p1, running poudriere, fails to umount after build, hangs hard:

umount: unmount of /pou/data/.m/143-default/21/usr/ports failed: Device busy
umount: unmount of /pou/data/.m/143-default/21/usr/local failed: Device busy
umount: unmount of /pou/data/.m/143-default/21/dev failed: Device busy
umount: unmount of /pou/data/.m/143-default/21/.p failed: Device busy

Reboot will probably hang as well (the last time I tried, it did).

What kind of diagnostic can be done ?

host: HPE DL380 Gen10
2x Intel Xeon-Platinum 8168
2.7GHz-3.7GHz/24-core/205W Processor

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