On Mon Mar 4, 2024 at 4:33 PM UTC, Boqun Feng wrote: > I haven't seen this issue before, looks to me the stall is caused by > clear_rseq_cs(), which is basically a put_user(), and I don't have an > immediate theory, could you share the kernel repo and configuration you > used, so that I can see if I can reproduce this? (Note I don't have the > exact device as you do nor an ARM64 Windows system with the exact > Windows build you are using). > > Regards, > Boqun This happens on the default Windows System for Linux 2 setup, thus the kernel built with the following sources: - https://github.com/microsoft/WSL2-Linux-Kernel/tree/linux-msft-wsl-5.15.y It also happens when I build the kernel myself from a more recent release: - https://github.com/maxboone/SQ2-Linux-Kernel-Builds Microsoft should have a Development Kit (Volterra) with identical hardware to mine (and other Surface Pro X, Surface Pro 9 users) that run into the same issue with WSL2. Moreover, the problem does not seem to occur on a regular Hyper-V VM (with a different / standard kernel though) at all, so reproduction might be difficult. The CPU that's shown by Hyper-V also differs from the one visible in WSL2, maybe colleagues over at Redmond know what CPU virtualization is used there? - https://github.com/microsoft/WSL/issues/9454#issuecomment-1976411786 Thanks, Max
