NetBSD Problem Report #55641
From www@netbsd.org Thu Sep 3 18:40:26 2020
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for <gnats-bugs@gnats.NetBSD.org>; Thu, 3 Sep 2020 18:40:26 +0000 (UTC)
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Date: Thu, 3 Sep 2020 18:40:25 +0000 (UTC)
From: davshao@gmail.com
Reply-To: davshao@gmail.com
To: gnats-bugs@NetBSD.org
Subject: Recent changes to random/entropy "pkgsrc devel brick" an Intel Ivy Bridge system, with workaround
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>Number: 55641
>Category: kern
>Synopsis: Recent changes to random/entropy "pkgsrc devel brick" an Intel Ivy Bridge system, with workaround
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: kern-bug-people
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Thu Sep 03 18:45:00 +0000 2020
>Last-Modified: Fri Sep 04 02:30:01 +0000 2020
>Originator: David Shao
>Release: NetBSD current after a couple of weeks ago
>Organization:
>Environment:
NetBSD xxxxxx.xxx 9.99.72 NetBSD 9.99.72 (GENERIC) #1: Thu Sep 3 08:36:53 PDT 2020 xxxxxx.xxx:/usr/obj/sys/arch/amd64/compile/GENERIC amd64
>Description:
After updating NetBSD current a couple of weeks ago, building pkgsrc devel/glib2 would stop on an Intel Ivy Bridge machine (Asus P8H77-V) motherboard, i3 CPU) at a line ending in something like
. output
That is what I mean by "pkgsrc devel bricking". Rebuilding the system, reinstalling the system, nothing will fix this.
Pressing Ctrl-C, on this system, I discovered building devel/glib2 stopped in a line calling a random number function. Then I remember seeing on boot a line flashing by talking about entropy.
This problem does not appear at all on an Intel Eagle Lake system and on a Comet Lake system. Therefore it will not appear across a wide variety of machines. But from what I am seeing in the mailing lists, it will appear for some number of contributors and will render their machines useless for further pkgsrc development unless worked around.
Why Ivy Bridge? I believe it introduced the RDRAND function. It would not surprise me if a first generation implementation had some edge cases.
>How-To-Repeat:
>Fix:
Look up a posting:
HEADS UP: Entropy overhaul
Date: Fri, 1 May 2020 21:10:58 +0000
Apply the following two lines as root as a workaround:
dd if=/dev/urandom of=/dev/random bs=32 count=1
sysctl -w kern.entropy.consolidate=1
In the long run, it seems unlikely a fix will ever be applied since the problem occurs for a small number of older machines. But there must be some way to communicate to people upgrading to current, or later to a release, to apply the workaround to "pkgsrc devel unbrick" their systems.
>Audit-Trail:
From: Taylor R Campbell <riastradh@NetBSD.org>
To: davshao@gmail.com
Cc: gnats-bugs@NetBSD.org
Subject: Re: kern/55641: Recent changes to random/entropy "pkgsrc devel brick" an Intel Ivy Bridge system, with workaround
Date: Fri, 4 Sep 2020 02:26:00 +0000
> Date: Thu, 3 Sep 2020 18:40:25 +0000 (UTC)
> From: davshao@gmail.com
>
> After updating NetBSD current a couple of weeks ago, building pkgsrc
> devel/glib2 would stop on an Intel Ivy Bridge machine (Asus P8H77-V)
> motherboard, i3 CPU) at a line ending in something like
>
> . output
>
> That is what I mean by "pkgsrc devel bricking". Rebuilding the
> system, reinstalling the system, nothing will fix this.
>
> Pressing Ctrl-C, on this system, I discovered building devel/glib2
> stopped in a line calling a random number function. Then I remember
> seeing on boot a line flashing by talking about entropy.
Can you please share the dmesg output, and share whatever kind of
trace led you to conclude `building devel/glib2 stopped in a line
calling a random number function'? Can you also share any relevant ps
or pstree output?
When did you last update before your most recent update a couple of
weeks ago?
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