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
