* Mirsad Todorovac <mirsad.todorovac@xxxxxxxxxxxx> [231001 17:09]: ... > > They say that one patch speaks more than a thousand words. > > I am just running this little patch that actually silences all of the KCSAN warnings. > > I cannot tell if these reported data races are the actual bugs, but it is possible that > the Ubuntu 22.04 gcc is doing some funny stuff when optimising. In Prof. McKenney's > book I've read about the load-tearing and store-tearing. AFAICS, memory barriers should > prevent load/store reordering, but not the compiler optimisations. > > Please find two versions of the patch attached. > > While mas->index and pivots[offset] in maple_range_walk can change concurrently, > I am not smart enough to see whether you expect that in your algorithm or is it a potential > bug triggered by GCC optimisations and aggressive Ryzen 9 7950X parallelism. None of this is necessary, for sure. I will have to look at this when I have more time to investigate. This will likely not be soon, however. Thanks, Liam
