The 5.11-rc5 kernel prepatch is out for testing. "Nothing particularly stands out. We had a couple of splice() regressions that came in during the previous release as part of the 'get rid of set_fs()' development, but they were for odd cases that most people would never notice. I think it's just that 5.10 is now getting more widely deployed so people see the fallout from that rather fundamental change in the last release."