Date: Sun, 16 Nov 2014 18:23:59 +0000 From: Mark R V Murray <markm@FreeBSD.org> To: Ian Lepore <ian@FreeBSD.org> 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> Subject: Re: USB locks up system -- WAS Re: shutdown or acpi problem Message-ID: <F0B9570C-BADD-4843-AE91-66CAB0B5DE85@FreeBSD.org> In-Reply-To: <1416162070.4781.186.camel@revolution.hippie.lan> 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%2BQwb=4KL2QfHE=ykQ2mNTJc5QerOEuw@mail.gmail.com> <20141116175102.GA35649@troutmask.apl.washington.edu> <D5925789-834A-42C8-9854-2E055592DA46@FreeBSD.org> <1416162070.4781.186.camel@revolution.hippie.lan>
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> On 16 Nov 2014, at 18:21, Ian Lepore <ian@FreeBSD.org> wrote: >=20 > 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: >>>=20 >>> Is there a 'random: device_detach():' missing between the 'umass0' >>> and 'da0' messages in the last 4 lines. >>=20 >> No. At attach time, the RNG grabs some probe entropy. At detach time = it does nothing. >>=20 >> M >=20 > 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? Nothing, except possibly harvesting interrupt entropy. I=E2=80=99ll = promise to be astonished if this is other-than-harmless. I=E2=80=99d be more suspicious of the harvester thread, but I still = can=E2=80=99t see how its hurting :-( M --=20 Mark R V Murray
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