From: Wei Liu <wei.liu2@citrix.com>
To: Aaron Cornelius <aaron.cornelius@dornerworks.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
Wei Liu <wei.liu2@citrix.com>,
Ian Jackson <Ian.Jackson@eu.citrix.com>,
Julien Grall <julien.grall@arm.com>,
Jan Beulich <jbeulich@suse.com>,
Xen-devel <xen-devel@lists.xenproject.org>
Subject: Re: Xen 4.7 crash
Date: Tue, 14 Jun 2016 14:15:13 +0100 [thread overview]
Message-ID: <20160614131513.GM28116@citrix.com> (raw)
In-Reply-To: <4c1522b5-3a47-ab9a-2c03-3c950dc9c0ad@dornerworks.com>
On Tue, Jun 14, 2016 at 09:11:47AM -0400, Aaron Cornelius wrote:
> On 6/9/2016 7:14 AM, Ian Jackson wrote:
> >Aaron Cornelius writes ("Re: [Xen-devel] Xen 4.7 crash"):
> >>I am not that familiar with the xenstored code, but as far as I can tell
> >>the grant mapping will be held by the xenstore until the xs_release()
> >>function is called (which is not called by libxl, and I do not
> >>explicitly call it in my software, although I might now just to be
> >>safe), or until the last reference to a domain is released and the
> >>registered destructor (destroy_domain), set by talloc_set_destructor(),
> >>is called.
> >
> >I'm not sure I follow. Or maybe I disagree. ISTM that:
> >
> >The grant mapping is released by destroy_domain, which is called via
> >the talloc destructor as a result of talloc_free(domain->conn) in
> >domain_cleanup. I don't see other references to domain->conn.
> >
> >domain_cleanup calls talloc_free on domain->conn when it sees the
> >domain marked as dying in domain_cleanup.
> >
> >So I still think that your acl reference ought not to keep the grant
> >mapping alive.
>
> It took a while to complete the testing, but we've finished trying to
> reproduce the error using oxenstored instead of the C xenstored. When the
> condition occurs that caused the error with the C xenstored (on
> 4.7.0-rc4/8478c9409a2c6726208e8dbc9f3e455b76725a33), oxenstored does not
> cause the crash.
>
> So for whatever reason, it would appear that the C xenstored does keep the
> grant allocations open, but oxenstored does not.
>
Can you provide some easy to follow steps to reproduce this issue?
AFAICT your environment is very specialised, but we should be able to
trigger the issue with plan xenstore-* utilities?
Wei.
> - Aaron Cornelius
>
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next prev parent reply other threads:[~2016-06-14 13:15 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-01 19:54 Xen 4.7 crash Aaron Cornelius
2016-06-01 20:00 ` Andrew Cooper
2016-06-01 20:45 ` Aaron Cornelius
2016-06-01 21:24 ` Andrew Cooper
2016-06-01 22:18 ` Julien Grall
2016-06-01 22:26 ` Andrew Cooper
2016-06-01 21:35 ` Andrew Cooper
2016-06-01 22:24 ` Julien Grall
2016-06-01 22:31 ` Andrew Cooper
2016-06-02 8:47 ` Jan Beulich
2016-06-02 8:53 ` Andrew Cooper
2016-06-02 9:07 ` Jan Beulich
2016-06-01 22:35 ` Julien Grall
2016-06-02 1:32 ` Aaron Cornelius
2016-06-02 8:49 ` Jan Beulich
2016-06-02 9:07 ` Julien Grall
2016-06-06 13:58 ` Aaron Cornelius
2016-06-06 14:05 ` Julien Grall
2016-06-06 14:19 ` Wei Liu
2016-06-06 15:02 ` Aaron Cornelius
2016-06-07 9:53 ` Ian Jackson
2016-06-07 13:40 ` Aaron Cornelius
2016-06-07 15:13 ` Aaron Cornelius
2016-06-09 11:14 ` Ian Jackson
2016-06-14 13:11 ` Aaron Cornelius
2016-06-14 13:15 ` Wei Liu [this message]
2016-06-14 13:26 ` Aaron Cornelius
2016-06-14 13:38 ` Aaron Cornelius
2016-06-14 13:47 ` Wei Liu
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