[Bug 271983] mi_switch hang in KVM on Sapphire Rapids running NET_EPOCH_DRAIN_CALLBACKS

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 13 Jun 2023 16:54:20 UTC

Mark Johnston <markj@FreeBSD.org> changed:

           What    |Removed                     |Added
             Status|New                         |Open
                 CC|                            |markj@FreeBSD.org

--- Comment #1 from Mark Johnston <markj@FreeBSD.org> ---
sched_bind() moves the calling thread to a different CPU, so here it's switched
off the old CPU and waiting for a chance to run on the new one.  If that's not
happening quickly, it's probably because some other, higher-priority thread is
monopolizing the target CPU.  top -H ought to be able to confirm whether that's
the case.

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