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

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Tue, Jan 27, 2015 at 04:47:45PM +0000, Julien Grall wrote:
> 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?
> 

Never saw  report like this before, even in the case that netfront is
buggy.

Wei.

> Regards,
> 
> -- 
> Julien Grall

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