Re: virtio-scsi issues duplicate tags when async_abort is enabled

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On Fri, 2014-06-13 at 11:52 -0700, Christoph Hellwig wrote:
> On Fri, Jun 13, 2014 at 10:58:22AM -0700, Venkatesh Srinivas wrote:
> > CC-ing stable as 3.14 and 3.15 are affected; a conservative fix is to
> > enable no_async_abort until the problem is better-understood.
> 
> No patch attached.  Nevermind this is not a consdervative fix, but a
> band aid.  The proper fix is to figure out what's actually going on
> here.
> 
> >From your trace above it very much looks like a double completion of
> some sort.
> 
> I've looked at the virtio-scsi code a bit, and one odd thing it does
> that comes in handy here is that it doesn't really use a traditional
> tag, but rather the address of the scsi command.

What kernel version?  This is the exact signature of the original USB
REQUEST_SENSE problem.

James


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