On Sun, Feb 17, 2019 at 5:34 AM Qian Cai <c...@lca.pw> wrote: > > Enabling function tracer with CONFIG_KASAN_SW_TAGS=y (hwasan) tracer > causes the whole system frozen on ThunderX2 systems with 256 CPUs, > because there is a burst of too much pointer access, and then KASAN will > dereference each byte of the shadow address for the tag checking which > will kill all the CPUs.
Hi Qian, Could you check if adding "CFLAGS_REMOVE_tags.o = -pg" into mm/kasan/Makefile helps with that? Thanks! > > Signed-off-by: Qian Cai <c...@lca.pw> > --- > kernel/trace/Makefile | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile > index c2b2148bb1d2..fdd547a68385 100644 > --- a/kernel/trace/Makefile > +++ b/kernel/trace/Makefile > @@ -28,6 +28,11 @@ ifdef CONFIG_GCOV_PROFILE_FTRACE > GCOV_PROFILE := y > endif > > +# Too much pointer access will kill hwasan. > +ifdef CONFIG_KASAN_SW_TAGS > +KASAN_SANITIZE := n > +endif > + > CFLAGS_trace_benchmark.o := -I$(src) > CFLAGS_trace_events_filter.o := -I$(src) > > -- > 2.17.2 (Apple Git-113) >