linux-kernel - Re: [Patch] UML: spurious interrupt freezes guest

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Date:	Mon, 19 Jan 2009 22:32:24 -0700
From:	Shane Hathaway <shane@...hawaymix.org>
To:	Jeff Dike <jdike@...toit.com>
CC:	linux-kernel@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net
Subject: Re: [Patch] UML: spurious interrupt freezes guest

Jeff Dike wrote:
> On Mon, Jan 19, 2009 at 08:53:25PM -0700, Shane Hathaway wrote:
>> A new instance of user mode linux that I created over the past couple of
>> days worked pretty well except that it had a habit of freezing after a
>> few minutes.  Every time it froze, the last message on the console was
>> either:
>>
>> spurious interrupt in ubd_handler, err = 4
> 
> What version and what's the workload?

I got the spurious interrupt with both Linux 2.6.28.1 and 2.6.27.12 as
guests.  The host runs 2.6.9-42.0.3.ELsmp.

I am putting OpenVPN and Asterisk inside the guest.  The guest is based
on Ubuntu 8.10.  The spurious interrupt happened more often when I
restricted the guest's RAM.  The processes in the guest normally consume
a total of about 20-24 MB of RAM.  I limited the guest's RAM to 48 MB
and gave it a 64 MB swap partition.  When I gave the guest only 32 MB,
the spurious interrupt seemed to happen more often.

The best way I found to trigger the spurious interrupt was to try to
"apt-get install" many packages at once.  The download would succeed,
but the guest would freeze partway through the install.

Shane
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