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Date:   Thu, 9 Sep 2021 21:16:26 +0000
From:   Ioana Ciornei <ioana.ciornei@....com>
To:     Jeremy Linton <jeremy.linton@....com>
CC:     Hamza Mahfooz <someguy@...ective-light.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: DPAA2 triggers, [PATCH] dma debug: report -EEXIST errors in
 add_dma_entry

On Wed, Sep 08, 2021 at 10:33:26PM -0500, Jeremy Linton wrote:
> +DPAA2, netdev maintainers
> Hi,
> 
> On 5/18/21 7:54 AM, Hamza Mahfooz wrote:
> > Since, overlapping mappings are not supported by the DMA API we should
> > report an error if active_cacheline_insert returns -EEXIST.
> 
> It seems this patch found a victim. I was trying to run iperf3 on a
> honeycomb (5.14.0, fedora 35) and the console is blasting this error message
> at 100% cpu. So, I changed it to a WARN_ONCE() to get the call trace, which
> is attached below.
> 

Thanks for the report.

I don't have access to hardware at the moment to actually see what's
happening since I'm on vacation.  I'll work on it in a few days.

Ioana

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