From mboxrd@z Thu Jan  1 00:00:00 1970
From: Julien Grall <julien.grall@linaro.org>
Subject: Re: rcu_sched self-detect stall when disable vif device
Date: Tue, 27 Jan 2015 16:47:45 +0000
Message-ID: <54C7C131.9030502@linaro.org>
References: <54C7B6E8.9080106@linaro.org>
	<20150127164539.GJ24026@zion.uk.xensource.com>
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To: Wei Liu <wei.liu2@citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>, xen-devel <xen-devel@lists.xen.org>
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On 27/01/15 16:45, Wei Liu wrote:
> On Tue, Jan 27, 2015 at 04:03:52PM +0000, Julien Grall wrote:
>> Hi,
>>
>> While I'm working on support for 64K page in netfront, I got
>> an rcu_sced self-detect message. It happens when netback is
>> disabling the vif device due to an error.
>>
>> I'm using Linux 3.19-rc5 on seattle (ARM64). Any idea why
>> the processor is stucked in xenvif_rx_queue_purge?
>>
> 
> When you try to release a SKB, core network driver need to enter some
> RCU cirital region to clean up. dst_release for one, calls call_rcu.

But this message shouldn't happen in normal condition or because of
netfront. Right?

Regards,

-- 
Julien Grall