D29454.diff
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	diff --git a/sys/conf/kern.pre.mk b/sys/conf/kern.pre.mk
	--- a/sys/conf/kern.pre.mk
	+++ b/sys/conf/kern.pre.mk
	@@ -92,6 +92,16 @@
	# XXX LOCORE means "don't declare C stuff" not "for locore.s".
	ASM_CFLAGS= -x assembler-with-cpp -DLOCORE ${CFLAGS} ${ASM_CFLAGS.${.IMPSRC:T}}

	+KASAN_ENABLED!= grep KASAN opt_global.h \|\| true ; echo
	+.if !empty(KASAN_ENABLED)
	+SAN_CFLAGS+= -fsanitize=kernel-address \
	+ -mllvm -asan-stack=true \
	+ -mllvm -asan-instrument-dynamic-allocas=true \
	+ -mllvm -asan-globals=true \
	+ -mllvm -asan-use-after-scope=true \
	+ -mllvm -asan-instrumentation-with-call-threshold=0
	+.endif
	+
	KCSAN_ENABLED!= grep KCSAN opt_global.h \|\| true ; echo
	.if !empty(KCSAN_ENABLED)
	SAN_CFLAGS+= -fsanitize=thread
	diff --git a/sys/conf/options b/sys/conf/options
	--- a/sys/conf/options
	+++ b/sys/conf/options
	@@ -229,6 +229,7 @@

	# Sanitizers
	COVERAGE opt_global.h
	+KASAN opt_global.h
	KCOV
	KCSAN opt_global.h
	KUBSAN opt_global.h