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Date:      Wed, 22 May 2024 13:34:49 +0000
From:      bugzilla-noreply@freebsd.org
To:        virtualization@FreeBSD.org
Subject:   [Bug 277559] kldload vmm sometimes hangs kernel on arm64
Message-ID:  <bug-277559-27103-vNxRHicCQX@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-277559-27103@https.bugs.freebsd.org/bugzilla/>
References:  <bug-277559-27103@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D277559

--- Comment #12 from John F. Carr <jfc@mit.edu> ---
I got another hang on kldload and this time ^T over the ssh session was
responsive for about a minute, ending with

load: 0.19  cmd: kldload 67182 [running] 53.73r 0.00u 0.01s 100% 1944k

The process is using 100% CPU but none of it is counted towards user or sys=
tem
time.

As I understand sched_4bsd.c and kern_clock, the percentage is based on what
thread is saved in curthread when the clock ticks and may include time that=
 an
ethical accounting system would not bill to the owner of the thread.  "Note
that we charge interrupts to the current process, regardless of whether they
are ``for'' that process".

--=20
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