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Date:   Sat, 16 Feb 2019 23:34:34 -0500
From:   Qian Cai <>
Cc:,,,,,,, Qian Cai <>
Subject: [PATCH] trace: skip hwasan

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 <>
 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
+# Too much pointer access will kill hwasan.
 CFLAGS_trace_benchmark.o := -I$(src)
 CFLAGS_trace_events_filter.o := -I$(src)
2.17.2 (Apple Git-113)

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