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Date:      Tue, 24 Feb 2026 15:54:31 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 293382] Dead lock and kernel crash around closefp_impl
Message-ID:  <bug-293382-227-IfgUtsG1NC@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-293382-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293382

--- Comment #4 from Mark Johnston <markj@FreeBSD.org> ---
(In reply to Paul from comment #3)
> And seeing `kqueue_scan` in both cases makes us suspect that these are two symptoms of the same issue.

Yes, I think they are likely related.

I wonder if you could try running your application on a GENERIC-DEBUG kernel? 
The output from comment 2 shows that the knote is a marker knote used during
list scans, it's pretty weird that knote_fdclose() would encounter one, and I
suspect that it reflects a bug elsewhere in the kqueue code.

Using a debug kernel would have a performance penalty but will hopefully make
it much easier to track this down.

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