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.
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)
