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Date:   Sat, 16 Feb 2019 23:34:34 -0500
From:   Qian Cai <cai@....pw>
To:     rostedt@...dmis.org, mingo@...hat.com
Cc:     will.deacon@....com, catalin.marinas@....com,
        andreyknvl@...gle.com, aryabinin@...tuozzo.com,
        linux-arm-kernel@...ts.infradead.org, kasan-dev@...glegroups.com,
        linux-kernel@...r.kernel.org, Qian Cai <cai@....pw>
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 <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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