Re: [Xen-devel] rcu_sched self-detect stall when disable vif device

[Julien Grall <julien.grall@xxxxxxxxxx>]

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

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