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Date: Mon, 18 Feb 2019 16:25:45 +0100 From: Andrey Konovalov <andreyknvl@...gle.com> To: Qian Cai <cai@....pw> Cc: Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...hat.com>, Will Deacon <will.deacon@....com>, Catalin Marinas <catalin.marinas@....com>, Andrey Ryabinin <aryabinin@...tuozzo.com>, Linux ARM <linux-arm-kernel@...ts.infradead.org>, kasan-dev <kasan-dev@...glegroups.com>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] trace: skip hwasan On Sun, Feb 17, 2019 at 5:34 AM Qian Cai <cai@....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 <cai@....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) >
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