On Fri, 3 Dec 2021 at 22:09, Paul E. McKenney <paulmck@xxxxxxxxxx> wrote: [...] > A few quick tests located the following: > > [ 0.635383] INFO: trying to register non-static key. > [ 0.635804] The code is fine but needs lockdep annotation, or maybe > [ 0.636194] you didn't initialize this object before use? > [ 0.636194] turning off the locking correctness validator. > [ 0.636194] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.16.0-rc1+ #3208 [...] > When running without the new patch series, this splat does not appear. > > Do I need a toolchain upgrade? I see the Clang 14.0 in the cover letter, > but that seems to apply only to non-x86 architectures. > > $ clang-11 -v > Ubuntu clang version 11.1.0-++20210805102428+1fdec59bffc1-1~exp1~20210805203044.169 Good catch! That would be lockdep telling me off for putting test locks on the stack. :-/ I thought I had tested this with lockdep, but it seems the set of semi-automated tests I run didn't (yet) generate a config with KCSAN_WEAK_MEMORY + LOCKDEP. This should be fixed by: https://lkml.kernel.org/r/20211203233817.2815340-1-elver@xxxxxxxxxx Thanks, -- Marco
