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Subject: Re: USB locks up system -- WAS Re: shutdown or acpi problem
From: Ian Lepore <ian@FreeBSD.org>
To: Mark R V Murray <markm@FreeBSD.org>
In-Reply-To: <D5925789-834A-42C8-9854-2E055592DA46@FreeBSD.org>
References: <20141112224212.GA14013@troutmask.apl.washington.edu>
 <20141113172533.GA18690@troutmask.apl.washington.edu>
 <20141113180332.GA18990@troutmask.apl.washington.edu>
 <20141113181515.GA19117@troutmask.apl.washington.edu>
 <546515BF.6030508@selasky.org>
 <20141113212206.GA20802@troutmask.apl.washington.edu>
 <20141116054141.GA33186@troutmask.apl.washington.edu>
 <CAJ-Vmo=8oQdi_5um3ck+Qwb=4KL2QfHE=ykQ2mNTJc5QerOEuw@mail.gmail.com>
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Date: Sun, 16 Nov 2014 11:21:10 -0700
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Cc: Hans Petter Selasky <hps@selasky.org>, Adrian Chadd <adrian@freebsd.org>,
 freebsd-current <freebsd-current@freebsd.org>,
 Dag-Erling Sm?rgrav <des@freebsd.org>,
 Steve Kargl <sgk@troutmask.apl.washington.edu>
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On Sun, 2014-11-16 at 18:17 +0000, Mark R V Murray wrote:
> > On 16 Nov 2014, at 17:51, Steve Kargl <sgk@troutmask.apl.washington.edu> wrote:
> > 
> > Is there a 'random: device_detach():' missing between the 'umass0'
> > and 'da0' messages in the last 4 lines.
> 
> No. At attach time, the RNG grabs some probe entropy. At detach time it does nothing.
> 
> M

And yet... Steve has gathered evidence that the system bricks when a
device is detached with the new entropy-gathering code and doesn't do so
prior to that code.  What else is the new code doing around detach time?

-- Ian