From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeremy Fitzhardinge <jeremy@goop.org>
Subject: blkback stuck in infinite loop in xen_blkbk_discard()
Date: Wed, 28 Sep 2011 14:40:33 -0700
Message-ID: <4E839451.40901@goop.org>
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To: Li Dongyang <lidongyang@novell.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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I just "xl destroy"d a domain, and now my dom0 kernel is sitting there
infinitely spewing:

vbd vbd-83-51712: 5 reading type
vbd vbd-83-51712: 5 reading type
vbd vbd-83-51712: 5 reading type
vbd vbd-83-51712: 5 reading type
vbd vbd-83-51712: 5 reading type
vbd vbd-83-51712: 5 reading type
vbd vbd-83-51712: 5 reading type
vbd vbd-83-51712: 5 reading type
vbd vbd-83-51712: 5 reading type
vbd vbd-83-51712: 5 reading type
vbd vbd-83-51712: 5 reading type
vbd vbd-83-51712: 5 reading type
vbd vbd-83-51712: 5 reading type
vbd vbd-83-51712: 5 reading type
vbd vbd-83-51712: 5 reading type
vbd vbd-83-51712: 5 reading type
vbd vbd-83-51712: 5 reading type
vbd vbd-83-51712: 5 reading type
vbd vbd-83-51712: 5 reading type

which seems to be coming from the error case in
drivers/block/xen-blkback/xenbus.c:xen_blkbk_discard().

I don't know what the backtrace is.  The system seems overall fine,
despite the console spew, though I have a pile of dying domains sitting
in odd states rather than being cleaned up.

    J