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[Xen-devel] Re: [PATCH] blkfront: Move blkif_interrupt into a tasklet.

To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: [Xen-devel] Re: [PATCH] blkfront: Move blkif_interrupt into a tasklet.
From: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Date: Thu, 23 Sep 2010 18:38:03 +0200
Cc: Andrew Jones <drjones@xxxxxxxxxx>, Xen <xen-devel@xxxxxxxxxxxxxxxxxxx>, Tom Kopec <tek@xxxxxxx>, Daniel Stodden <daniel.stodden@xxxxxxxxxx>
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On 09/23/2010 06:23 PM, Jeremy Fitzhardinge wrote:
Any developments with this? I've got a report of the exact same warnings
on RHEL6 guest. See


RHEL6 doesn't have the 'Move blkif_interrupt into a tasklet' patch, so
that can be ruled out. Unfortunately I don't have this reproducing on a
test machine, so it's difficult to debug.  The report I have showed that
in at least one case it occurred on boot up, right after initting the
block device. I'm trying to get confirmation if that's always the case.

Thanks in advance for any pointers you might have.

Yes, I see it even after reverting that change as well.  However I only
see it on my domain with an XFS filesystem, but I haven't dug any deeper
to see if that's relevant.

Do you know when this appeared?  Is it recent?  What changes are in the
rhel6 kernel in question?

It's got pretty much everything in stable-2.6.32.x, up to the 16 patch blkfront series you posted last July. There are some RHEL-specific workarounds for PV-on-HVM, but for PV domains everything matches upstream.


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