From: Gal Pressman <galpress@amazon.com>
To: Jason Gunthorpe <jgg@ziepe.ca>, Leon Romanovsky <leon@kernel.org>,
Christoph Hellwig <hch@lst.de>
Cc: RDMA mailing list <linux-rdma@vger.kernel.org>
Subject: Re: ib_umem_get and DMA_API_DEBUG question
Date: Tue, 27 Aug 2019 11:28:20 +0300 [thread overview]
Message-ID: <9bae7550-35cf-b183-1e1c-fd1f8e01ef79@amazon.com> (raw)
In-Reply-To: <526c5b18-5853-c8dc-e112-31287a46e707@amazon.com>
On 26/08/2019 17:05, Gal Pressman wrote:
> Hi all,
>
> Lately I've been seeing DMA-API call traces on our automated testing runs which
> complain about overlapping mappings of the same cacheline [1].
> The problem is (most likely) caused due to multiple calls to ibv_reg_mr with the
> same address, which as a result DMA maps the same physical addresses more than 7
> (ACTIVE_CACHELINE_MAX_OVERLAP) times.
BTW, on rare occasions I'm seeing the boundary check in check_sg_segment [1]
fail as well. I don't have a stable repro for it though.
Is this a known issue as well? The comment there states it might be a bug in the
DMA API implementation, but I'm not sure.
[1] https://elixir.bootlin.com/linux/v5.3-rc3/source/kernel/dma/debug.c#L1230
next prev parent reply other threads:[~2019-08-27 8:28 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-26 14:05 ib_umem_get and DMA_API_DEBUG question Gal Pressman
2019-08-26 14:23 ` Leon Romanovsky
2019-08-26 14:39 ` Gal Pressman
2019-08-26 14:39 ` Jason Gunthorpe
2019-08-27 8:28 ` Gal Pressman [this message]
2019-08-27 12:00 ` Jason Gunthorpe
2019-08-27 12:53 ` Gal Pressman
2019-08-27 13:17 ` Jason Gunthorpe
2019-08-27 13:22 ` Gal Pressman
2019-08-27 13:37 ` Jason Gunthorpe
2019-08-27 13:53 ` Gal Pressman
2019-08-28 14:15 ` Jason Gunthorpe
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