From owner-freebsd-usb@freebsd.org  Sat Jun 20 17:22:36 2020
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Subject: Re: USB System hangs after removing Yubikey
To: Joseph Ward <jbwlists@hilltopgroup.com>, freebsd-usb@freebsd.org
References: <ac0918bd-ddc4-58a8-7fa8-e2bd1d890337@hilltopgroup.com>
From: Hans Petter Selasky <hps@selasky.org>
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Date: Sat, 20 Jun 2020 19:22:14 +0200
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On 2020-06-20 19:03, Joseph Ward wrote:
> Can anyone propose any other troubleshooting steps I should take?

Try doing "procstat -akk", maybe some process is simply not exiting 
properly freeing the handle it has got for the USB device.

--HPS