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Re: port-xen/46313: xen instance throws evtchn_do_event: handler 0xffffffff80120c17 didn't lower ipl 8 7
The following reply was made to PR port-xen/46313; it has been noted by GNATS.
From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
Cc: port-xen-maintainer%NetBSD.org@localhost, gnats-admin%NetBSD.org@localhost,
Subject: Re: port-xen/46313: xen instance throws evtchn_do_event: handler
0xffffffff80120c17 didn't lower ipl 8 7
Date: Thu, 12 Apr 2012 20:16:31 +0200
On Mon, Apr 09, 2012 at 12:00:01AM +0000, Charlie Root wrote:
> Apr 8 15:15:23 admin /netbsd: evtchn_do_event: handler 0xffffffff80120c17
> didn't lower ipl 8 7
> This is also repeatable with running Xen under VMWare with linux dom0 and
> amd64 domu (my original testbed).
This is a known issue. The problem is that a interrupt handler (most
likely something called from hardclock() called from the clock interrupt
handler) failed returns at a higher IPL than it was called. I've never
took time to investigate further.
The message is annoying but harmless because the Xen interrupt code will
restore the right IPL. But I think the underlying bug is real and may
cause problems on other ports ...
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
NetBSD: 26 ans d'experience feront toujours la difference
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