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Date:      Fri, 28 Nov 2025 16:45:31 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 291269] kqueue(2): Panic on cleanup
Message-ID:  <bug-291269-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291269

            Bug ID: 291269
           Summary: kqueue(2): Panic on cleanup
           Product: Base System
           Version: 15.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: jake@technologyfriends.net

I am running into an issue when using syncthing (a p2p file sync program) where
the system panics when sync starts up. I have run into the bug consistently on
15-RC2 and 16 CURRENT as of a week ago.

The bug seems to be caused by the underlying kqueue memory being freed before
the knotes are cleaned up.

Panic dumps are here: https://people.freebsd.org/~jfree/kqueue_panic/

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