From: David Vrabel <david.vrabel@citrix.com>
To: Sander Eikelenboom <linux@eikelenboom.it>
Cc: xen-devel <xen-devel@lists.xenproject.org>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Wei Liu <wei.liu2@citrix.com>
Subject: Re: BUG: using smp_processor_id() in preemptible [00000000] code: blkback.1.xvdb/9138 caller is decrease_reservation
Date: Wed, 11 Sep 2013 11:09:05 +0100 [thread overview]
Message-ID: <52304141.7040309@citrix.com> (raw)
In-Reply-To: <1323058712.20130910201353@eikelenboom.it>
On 10/09/13 19:13, Sander Eikelenboom wrote:
> Hi Wei,
>
> Just back from holiday i tried running a new xen-unstable and linux
> kernel (current Linus his tree + Konrad's last pull request merged on top).
> I saw a thread and patch about a bug_on in increase_reservation ...
> i'm seeing the splat below in dom0 when guests get started.
Yes, the use of __per_cpu() in decrease_reservation is not safe.
Stefano, what testing did you give "xen/balloon: set a mapping for
ballooned out pages" (cd9151e2). The number of critical problems it's
had suggests not a lot?
I'm also becoming less happy with the inconsistency between the p2m
updates between the different (non-)auto_translated_physmap guest types.
I think it (and all the attempts to fix it) should be reverted at this
stage and we should try again for 3.13 which some more through testing
and a more careful look at what updates to the p2m are needed.
David
next prev parent reply other threads:[~2013-09-11 10:09 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-10 18:13 BUG: using smp_processor_id() in preemptible [00000000] code: blkback.1.xvdb/9138 caller is decrease_reservation Sander Eikelenboom
2013-09-11 9:25 ` Wei Liu
2013-09-11 10:09 ` David Vrabel [this message]
2013-09-11 12:08 ` Stefano Stabellini
2013-09-11 12:39 ` David Vrabel
2013-09-11 16:25 ` Sander Eikelenboom
2013-09-11 17:04 ` Sander Eikelenboom
2013-09-11 17:15 ` Stefano Stabellini
2013-09-11 17:29 ` Wei Liu
2013-09-11 17:35 ` Stefano Stabellini
2013-09-11 17:42 ` Konrad Rzeszutek Wilk
2013-09-11 17:44 ` Stefano Stabellini
2013-09-11 17:55 ` Stefano Stabellini
2013-09-11 19:16 ` Wei Liu
2013-09-11 17:58 ` Sander Eikelenboom
2013-09-11 16:31 ` Stefano Stabellini
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