https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84863
--- Comment #3 from Arnd Bergmann <arnd at linaro dot org> --- The problem in the kernel then is that we then have to turn off the sanitizers for the 'allmodconfig' build, since the recommended minimum regression testing for kernel changes involves building a kernel with all options (including UBSAN) enabled and checking that there are no compiler warnings. This means we would fail to catch any build regressions in the kernel part of UBSAN, as well as any legitimate warnings that are only seen when the sanitizers are active.
