Hey Anatoly, Burakov, Anatoly, Sep 04, 2025 at 16:35: > I have been trying to reproduce this but I'm unable to. I run some old > CentOS so I built GCC15 manually and tried reproducing with that. The > version I'm using is 15.2, could you please retest with latest GCC15 and > see if it was fixed?
I am running on Fedora 42 that has GCC 15.2.1 and the problem persists. > (if not, I'll try to get a more recent distro and reproduce again) > > The DMA mask checking you're referring to is there for cases where e.g. > in a VM the emulated IOMMU will not have full address width (39 bits was > common at the time), and thus we couldn't use the full VA space for IOVA > addressing, and had to resort to using real physical addresses (because > kernel ensure those are to be within support range of IOMMU). Were you > running this test in a VM, by any chance? No I am running on a physical machine. I tested again without --no-huge and 2M/1G huge pages, and the issue persists as well. I tried both as root, and as a regular user. -- Robin > Formatted to fit your screen.
