linux-kernel - Re: [Report] annoyed dma debug warning "cacheline tracking EEXIST, overlapping mappings aren't supported"

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Message-ID: <a9fcd235-18b5-4b17-bd4f-75dc2d228e17@kernel.dk>
Date: Mon, 14 Oct 2024 09:17:13 -0600
From: Jens Axboe <axboe@...nel.dk>
To: Ming Lei <ming.lei@...hat.com>,
 Hamza Mahfooz <someguy@...ective-light.com>, Christoph Hellwig <hch@....de>,
 Dan Williams <dan.j.williams@...el.com>
Cc: linux-block@...r.kernel.org, io-uring@...r.kernel.org,
 linux-raid@...r.kernel.org, iommu@...ts.linux.dev,
 linux-kernel@...r.kernel.org
Subject: Re: [Report] annoyed dma debug warning "cacheline tracking EEXIST,
 overlapping mappings aren't supported"

On 10/13/24 7:27 PM, Ming Lei wrote:
> Hello Guys,
> 
> I got more and more reports on DMA debug warning "cacheline tracking EEXIST,
> overlapping mappings aren't supported" in storage related tests:

This is easily triggerable with dio and reusing a buffer. But it looks
like this will only trigger if CONFIG_DMA_API_DEBUG is set, so should
not be a prod issue? If so, I'd say that debug printk should be killed.

Maybe turn it into a pr_warn_once() or something?

-- 
Jens Axboe