From mboxrd@z Thu Jan  1 00:00:00 1970
From: Philipp Hahn <hahn@univention.de>
Subject: Re: RFH: Kernel OOPS in xen_netbk_rx_action /
	xenvif_gop_skb
Date: Fri, 27 Jun 2014 20:24:51 +0200
Message-ID: <53ADB6F3.4090301@univention.de>
References: <5391976F.8020800@univention.de>	<20140606105804.GD11959@zion.uk.xensource.com>	<53923CD0.7010001@univention.de>	<53A1C2DF.10407@univention.de>	<20140619141252.GO20819@zion.uk.xensource.com>	<53A84002.5050402@univention.de>	<53AD2E70.5060002@univention.de>
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To: Wei Liu <wei.liu2@citrix.com>
Cc: xen-devel <xen-devel@lists.xenproject.org>, Erik Damrose <Damrose@univention.de>, Ian Campbell <ian.campbell@citrix.com>, Zoltan Kiss <zoltan.kiss@citrix.com>
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Hello Wei Liu,

On 27.06.2014 19:48, Philipp Hahn wrote:> I guess we found the problem
ourselves: For thus removed skb's the
> reference counter on the associated vif was not decremented, as it is
> normally done in two locations at the end of the function
> xen_netbk_rx_action():
...
> The test is currently running again for the weekend and on Monday we
> will hopefully know more.

FYI: The test VM survived the first reboot without locking up:

Jun 27 19:43:43 xenmbint05b01 kernel: [ 1716.359537] UniDEBUG
vif->mapped is set to false (xenvif_alloc)
Jun 27 19:43:45 xenmbint05b01 kernel: [ 1718.558540] UniDEBUG
vif->mapped is true (xen_netbk_map_frontend_rings)
Jun 27 19:49:23 xenmbint05b01 kernel: [ 2055.895207] UniDEBUG
vif->mapped is set to false(xen_netbk_unmap_frontend_rings)
Jun 27 19:49:23 xenmbint05b01 kernel: [ 2055.898349] UniDEBUG
vif->mapped is false
Jun 27 19:49:23 xenmbint05b01 kernel: [ 2055.898352] UniDEBUG
vif->mapped is false
Jun 27 19:49:25 xenmbint05b01 kernel: [ 2058.529454] UniDEBUG
vif->mapped is set to false (xenvif_alloc)

BYtE
Philipp