Re: port-xen/46313: xen instance throws evtchn_do_event: handler 0xffffffff80120c17 didn't lower ipl 8 7

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

The following reply was made to PR port-xen/46313; it has been noted by GNATS.

From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: port-xen-maintainer%NetBSD.org@localhost, gnats-admin%NetBSD.org@localhost,
        netbsd-bugs%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:
 > >Description:
 >      
 > 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
 --