Mark asan fake stacks during machine stack marking

ASAN leaves a pointer to the fake frame on the stack; we can use the
__asan_addr_is_in_fake_stack API to work out the extent of the fake
stack and thus mark any VALUEs contained therein.

[Bug #20001]

common.mk

@@ -2000,6 +2000,7 @@ array.$(OBJEXT): $(top_srcdir)/internal/numeric.h
 array.$(OBJEXT): $(top_srcdir)/internal/object.h
 array.$(OBJEXT): $(top_srcdir)/internal/proc.h
 array.$(OBJEXT): $(top_srcdir)/internal/rational.h
+array.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 array.$(OBJEXT): $(top_srcdir)/internal/serial.h
 array.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 array.$(OBJEXT): $(top_srcdir)/internal/variable.h
@@ -2213,6 +2214,7 @@ ast.$(OBJEXT): $(top_srcdir)/internal/numeric.h
 ast.$(OBJEXT): $(top_srcdir)/internal/parse.h
 ast.$(OBJEXT): $(top_srcdir)/internal/rational.h
 ast.$(OBJEXT): $(top_srcdir)/internal/ruby_parser.h
+ast.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 ast.$(OBJEXT): $(top_srcdir)/internal/serial.h
 ast.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 ast.$(OBJEXT): $(top_srcdir)/internal/symbol.h
@@ -2648,6 +2650,7 @@ builtin.$(OBJEXT): $(top_srcdir)/internal/basic_operators.h
 builtin.$(OBJEXT): $(top_srcdir)/internal/compilers.h
 builtin.$(OBJEXT): $(top_srcdir)/internal/gc.h
 builtin.$(OBJEXT): $(top_srcdir)/internal/imemo.h
+builtin.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 builtin.$(OBJEXT): $(top_srcdir)/internal/serial.h
 builtin.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 builtin.$(OBJEXT): $(top_srcdir)/internal/variable.h
@@ -2877,6 +2880,7 @@ class.$(OBJEXT): $(top_srcdir)/internal/gc.h
 class.$(OBJEXT): $(top_srcdir)/internal/hash.h
 class.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 class.$(OBJEXT): $(top_srcdir)/internal/object.h
+class.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 class.$(OBJEXT): $(top_srcdir)/internal/serial.h
 class.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 class.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -3274,6 +3278,7 @@ compile.$(OBJEXT): $(top_srcdir)/internal/object.h
 compile.$(OBJEXT): $(top_srcdir)/internal/rational.h
 compile.$(OBJEXT): $(top_srcdir)/internal/re.h
 compile.$(OBJEXT): $(top_srcdir)/internal/ruby_parser.h
+compile.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 compile.$(OBJEXT): $(top_srcdir)/internal/serial.h
 compile.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 compile.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -3527,6 +3532,7 @@ complex.$(OBJEXT): $(top_srcdir)/internal/math.h
 complex.$(OBJEXT): $(top_srcdir)/internal/numeric.h
 complex.$(OBJEXT): $(top_srcdir)/internal/object.h
 complex.$(OBJEXT): $(top_srcdir)/internal/rational.h
+complex.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 complex.$(OBJEXT): $(top_srcdir)/internal/serial.h
 complex.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 complex.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -3971,6 +3977,7 @@ debug.$(OBJEXT): $(top_srcdir)/internal/class.h
 debug.$(OBJEXT): $(top_srcdir)/internal/compilers.h
 debug.$(OBJEXT): $(top_srcdir)/internal/gc.h
 debug.$(OBJEXT): $(top_srcdir)/internal/imemo.h
+debug.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 debug.$(OBJEXT): $(top_srcdir)/internal/serial.h
 debug.$(OBJEXT): $(top_srcdir)/internal/signal.h
 debug.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
@@ -4348,6 +4355,7 @@ dir.$(OBJEXT): $(top_srcdir)/internal/gc.h
 dir.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 dir.$(OBJEXT): $(top_srcdir)/internal/io.h
 dir.$(OBJEXT): $(top_srcdir)/internal/object.h
+dir.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 dir.$(OBJEXT): $(top_srcdir)/internal/serial.h
 dir.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 dir.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -6271,6 +6279,7 @@ enumerator.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 enumerator.$(OBJEXT): $(top_srcdir)/internal/numeric.h
 enumerator.$(OBJEXT): $(top_srcdir)/internal/range.h
 enumerator.$(OBJEXT): $(top_srcdir)/internal/rational.h
+enumerator.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 enumerator.$(OBJEXT): $(top_srcdir)/internal/serial.h
 enumerator.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 enumerator.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -6483,6 +6492,7 @@ error.$(OBJEXT): $(top_srcdir)/internal/io.h
 error.$(OBJEXT): $(top_srcdir)/internal/load.h
 error.$(OBJEXT): $(top_srcdir)/internal/object.h
 error.$(OBJEXT): $(top_srcdir)/internal/process.h
+error.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 error.$(OBJEXT): $(top_srcdir)/internal/serial.h
 error.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 error.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -6699,6 +6709,7 @@ eval.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 eval.$(OBJEXT): $(top_srcdir)/internal/inits.h
 eval.$(OBJEXT): $(top_srcdir)/internal/io.h
 eval.$(OBJEXT): $(top_srcdir)/internal/object.h
+eval.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 eval.$(OBJEXT): $(top_srcdir)/internal/serial.h
 eval.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 eval.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -7434,6 +7445,7 @@ goruby.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 goruby.$(OBJEXT): $(top_srcdir)/internal/numeric.h
 goruby.$(OBJEXT): $(top_srcdir)/internal/rational.h
 goruby.$(OBJEXT): $(top_srcdir)/internal/ruby_parser.h
+goruby.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 goruby.$(OBJEXT): $(top_srcdir)/internal/serial.h
 goruby.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 goruby.$(OBJEXT): $(top_srcdir)/internal/variable.h
@@ -7670,6 +7682,7 @@ hash.$(OBJEXT): $(top_srcdir)/internal/hash.h
 hash.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 hash.$(OBJEXT): $(top_srcdir)/internal/object.h
 hash.$(OBJEXT): $(top_srcdir)/internal/proc.h
+hash.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 hash.$(OBJEXT): $(top_srcdir)/internal/serial.h
 hash.$(OBJEXT): $(top_srcdir)/internal/st.h
 hash.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
@@ -8082,6 +8095,7 @@ io.$(OBJEXT): $(top_srcdir)/internal/io.h
 io.$(OBJEXT): $(top_srcdir)/internal/numeric.h
 io.$(OBJEXT): $(top_srcdir)/internal/object.h
 io.$(OBJEXT): $(top_srcdir)/internal/process.h
+io.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 io.$(OBJEXT): $(top_srcdir)/internal/serial.h
 io.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 io.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -8756,6 +8770,7 @@ load.$(OBJEXT): $(top_srcdir)/internal/numeric.h
 load.$(OBJEXT): $(top_srcdir)/internal/parse.h
 load.$(OBJEXT): $(top_srcdir)/internal/rational.h
 load.$(OBJEXT): $(top_srcdir)/internal/ruby_parser.h
+load.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 load.$(OBJEXT): $(top_srcdir)/internal/serial.h
 load.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 load.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -9485,6 +9500,7 @@ marshal.$(OBJEXT): $(top_srcdir)/internal/hash.h
 marshal.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 marshal.$(OBJEXT): $(top_srcdir)/internal/numeric.h
 marshal.$(OBJEXT): $(top_srcdir)/internal/object.h
+marshal.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 marshal.$(OBJEXT): $(top_srcdir)/internal/serial.h
 marshal.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 marshal.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -9869,6 +9885,7 @@ memory_view.$(OBJEXT): $(top_srcdir)/internal/compilers.h
 memory_view.$(OBJEXT): $(top_srcdir)/internal/gc.h
 memory_view.$(OBJEXT): $(top_srcdir)/internal/hash.h
 memory_view.$(OBJEXT): $(top_srcdir)/internal/imemo.h
+memory_view.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 memory_view.$(OBJEXT): $(top_srcdir)/internal/serial.h
 memory_view.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 memory_view.$(OBJEXT): $(top_srcdir)/internal/variable.h
@@ -10080,6 +10097,7 @@ miniinit.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 miniinit.$(OBJEXT): $(top_srcdir)/internal/numeric.h
 miniinit.$(OBJEXT): $(top_srcdir)/internal/rational.h
 miniinit.$(OBJEXT): $(top_srcdir)/internal/ruby_parser.h
+miniinit.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 miniinit.$(OBJEXT): $(top_srcdir)/internal/serial.h
 miniinit.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 miniinit.$(OBJEXT): $(top_srcdir)/internal/variable.h
@@ -10328,6 +10346,7 @@ node.$(OBJEXT): $(top_srcdir)/internal/compilers.h
 node.$(OBJEXT): $(top_srcdir)/internal/gc.h
 node.$(OBJEXT): $(top_srcdir)/internal/hash.h
 node.$(OBJEXT): $(top_srcdir)/internal/imemo.h
+node.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 node.$(OBJEXT): $(top_srcdir)/internal/serial.h
 node.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 node.$(OBJEXT): $(top_srcdir)/internal/variable.h
@@ -10535,6 +10554,7 @@ node_dump.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 node_dump.$(OBJEXT): $(top_srcdir)/internal/numeric.h
 node_dump.$(OBJEXT): $(top_srcdir)/internal/rational.h
 node_dump.$(OBJEXT): $(top_srcdir)/internal/ruby_parser.h
+node_dump.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 node_dump.$(OBJEXT): $(top_srcdir)/internal/serial.h
 node_dump.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 node_dump.$(OBJEXT): $(top_srcdir)/internal/variable.h
@@ -10743,6 +10763,7 @@ numeric.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 numeric.$(OBJEXT): $(top_srcdir)/internal/numeric.h
 numeric.$(OBJEXT): $(top_srcdir)/internal/object.h
 numeric.$(OBJEXT): $(top_srcdir)/internal/rational.h
+numeric.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 numeric.$(OBJEXT): $(top_srcdir)/internal/serial.h
 numeric.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 numeric.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -10956,6 +10977,7 @@ object.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 object.$(OBJEXT): $(top_srcdir)/internal/inits.h
 object.$(OBJEXT): $(top_srcdir)/internal/numeric.h
 object.$(OBJEXT): $(top_srcdir)/internal/object.h
+object.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 object.$(OBJEXT): $(top_srcdir)/internal/serial.h
 object.$(OBJEXT): $(top_srcdir)/internal/st.h
 object.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
@@ -11170,6 +11192,7 @@ pack.$(OBJEXT): $(top_srcdir)/internal/bits.h
 pack.$(OBJEXT): $(top_srcdir)/internal/compilers.h
 pack.$(OBJEXT): $(top_srcdir)/internal/gc.h
 pack.$(OBJEXT): $(top_srcdir)/internal/imemo.h
+pack.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 pack.$(OBJEXT): $(top_srcdir)/internal/serial.h
 pack.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 pack.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -11389,6 +11412,7 @@ parse.$(OBJEXT): $(top_srcdir)/internal/parse.h
 parse.$(OBJEXT): $(top_srcdir)/internal/rational.h
 parse.$(OBJEXT): $(top_srcdir)/internal/re.h
 parse.$(OBJEXT): $(top_srcdir)/internal/ruby_parser.h
+parse.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 parse.$(OBJEXT): $(top_srcdir)/internal/serial.h
 parse.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 parse.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -12641,6 +12665,7 @@ proc.$(OBJEXT): $(top_srcdir)/internal/gc.h
 proc.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 proc.$(OBJEXT): $(top_srcdir)/internal/object.h
 proc.$(OBJEXT): $(top_srcdir)/internal/proc.h
+proc.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 proc.$(OBJEXT): $(top_srcdir)/internal/serial.h
 proc.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 proc.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -12885,6 +12910,7 @@ process.$(OBJEXT): $(top_srcdir)/internal/io.h
 process.$(OBJEXT): $(top_srcdir)/internal/numeric.h
 process.$(OBJEXT): $(top_srcdir)/internal/object.h
 process.$(OBJEXT): $(top_srcdir)/internal/process.h
+process.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 process.$(OBJEXT): $(top_srcdir)/internal/serial.h
 process.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 process.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -13107,6 +13133,7 @@ ractor.$(OBJEXT): $(top_srcdir)/internal/hash.h
 ractor.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 ractor.$(OBJEXT): $(top_srcdir)/internal/numeric.h
 ractor.$(OBJEXT): $(top_srcdir)/internal/rational.h
+ractor.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 ractor.$(OBJEXT): $(top_srcdir)/internal/serial.h
 ractor.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 ractor.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -13729,6 +13756,7 @@ rational.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 rational.$(OBJEXT): $(top_srcdir)/internal/numeric.h
 rational.$(OBJEXT): $(top_srcdir)/internal/object.h
 rational.$(OBJEXT): $(top_srcdir)/internal/rational.h
+rational.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 rational.$(OBJEXT): $(top_srcdir)/internal/serial.h
 rational.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 rational.$(OBJEXT): $(top_srcdir)/internal/variable.h
@@ -13935,6 +13963,7 @@ re.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 re.$(OBJEXT): $(top_srcdir)/internal/object.h
 re.$(OBJEXT): $(top_srcdir)/internal/ractor.h
 re.$(OBJEXT): $(top_srcdir)/internal/re.h
+re.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 re.$(OBJEXT): $(top_srcdir)/internal/serial.h
 re.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 re.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -15118,6 +15147,7 @@ rjit.$(OBJEXT): $(top_srcdir)/internal/gc.h
 rjit.$(OBJEXT): $(top_srcdir)/internal/hash.h
 rjit.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 rjit.$(OBJEXT): $(top_srcdir)/internal/process.h
+rjit.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 rjit.$(OBJEXT): $(top_srcdir)/internal/serial.h
 rjit.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 rjit.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -15647,6 +15677,7 @@ ruby.$(OBJEXT): $(top_srcdir)/internal/object.h
 ruby.$(OBJEXT): $(top_srcdir)/internal/parse.h
 ruby.$(OBJEXT): $(top_srcdir)/internal/rational.h
 ruby.$(OBJEXT): $(top_srcdir)/internal/ruby_parser.h
+ruby.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 ruby.$(OBJEXT): $(top_srcdir)/internal/serial.h
 ruby.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 ruby.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -16065,6 +16096,7 @@ scheduler.$(OBJEXT): $(top_srcdir)/internal/basic_operators.h
 scheduler.$(OBJEXT): $(top_srcdir)/internal/compilers.h
 scheduler.$(OBJEXT): $(top_srcdir)/internal/gc.h
 scheduler.$(OBJEXT): $(top_srcdir)/internal/imemo.h
+scheduler.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 scheduler.$(OBJEXT): $(top_srcdir)/internal/serial.h
 scheduler.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 scheduler.$(OBJEXT): $(top_srcdir)/internal/thread.h
@@ -16429,6 +16461,7 @@ shape.$(OBJEXT): $(top_srcdir)/internal/error.h
 shape.$(OBJEXT): $(top_srcdir)/internal/gc.h
 shape.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 shape.$(OBJEXT): $(top_srcdir)/internal/object.h
+shape.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 shape.$(OBJEXT): $(top_srcdir)/internal/serial.h
 shape.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 shape.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -17645,6 +17678,7 @@ struct.$(OBJEXT): $(top_srcdir)/internal/hash.h
 struct.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 struct.$(OBJEXT): $(top_srcdir)/internal/object.h
 struct.$(OBJEXT): $(top_srcdir)/internal/proc.h
+struct.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 struct.$(OBJEXT): $(top_srcdir)/internal/serial.h
 struct.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 struct.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -17855,6 +17889,7 @@ symbol.$(OBJEXT): $(top_srcdir)/internal/gc.h
 symbol.$(OBJEXT): $(top_srcdir)/internal/hash.h
 symbol.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 symbol.$(OBJEXT): $(top_srcdir)/internal/object.h
+symbol.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 symbol.$(OBJEXT): $(top_srcdir)/internal/serial.h
 symbol.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 symbol.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -18076,6 +18111,7 @@ thread.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 thread.$(OBJEXT): $(top_srcdir)/internal/io.h
 thread.$(OBJEXT): $(top_srcdir)/internal/object.h
 thread.$(OBJEXT): $(top_srcdir)/internal/proc.h
+thread.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 thread.$(OBJEXT): $(top_srcdir)/internal/serial.h
 thread.$(OBJEXT): $(top_srcdir)/internal/signal.h
 thread.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
@@ -18329,6 +18365,7 @@ time.$(OBJEXT): $(top_srcdir)/internal/hash.h
 time.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 time.$(OBJEXT): $(top_srcdir)/internal/numeric.h
 time.$(OBJEXT): $(top_srcdir)/internal/rational.h
+time.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 time.$(OBJEXT): $(top_srcdir)/internal/serial.h
 time.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 time.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -18892,6 +18929,7 @@ variable.$(OBJEXT): $(top_srcdir)/internal/hash.h
 variable.$(OBJEXT): $(top_srcdir)/internal/imemo.h
 variable.$(OBJEXT): $(top_srcdir)/internal/object.h
 variable.$(OBJEXT): $(top_srcdir)/internal/re.h
+variable.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 variable.$(OBJEXT): $(top_srcdir)/internal/serial.h
 variable.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 variable.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -19104,6 +19142,7 @@ version.$(OBJEXT): $(top_srcdir)/internal/cmdlineopt.h
 version.$(OBJEXT): $(top_srcdir)/internal/compilers.h
 version.$(OBJEXT): $(top_srcdir)/internal/gc.h
 version.$(OBJEXT): $(top_srcdir)/internal/imemo.h
+version.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 version.$(OBJEXT): $(top_srcdir)/internal/serial.h
 version.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 version.$(OBJEXT): $(top_srcdir)/internal/variable.h
@@ -19592,6 +19631,7 @@ vm_backtrace.$(OBJEXT): $(top_srcdir)/internal/compilers.h
 vm_backtrace.$(OBJEXT): $(top_srcdir)/internal/error.h
 vm_backtrace.$(OBJEXT): $(top_srcdir)/internal/gc.h
 vm_backtrace.$(OBJEXT): $(top_srcdir)/internal/imemo.h
+vm_backtrace.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 vm_backtrace.$(OBJEXT): $(top_srcdir)/internal/serial.h
 vm_backtrace.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 vm_backtrace.$(OBJEXT): $(top_srcdir)/internal/string.h
@@ -19821,6 +19861,7 @@ vm_dump.$(OBJEXT): $(top_srcdir)/internal/basic_operators.h
 vm_dump.$(OBJEXT): $(top_srcdir)/internal/compilers.h
 vm_dump.$(OBJEXT): $(top_srcdir)/internal/gc.h
 vm_dump.$(OBJEXT): $(top_srcdir)/internal/imemo.h
+vm_dump.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 vm_dump.$(OBJEXT): $(top_srcdir)/internal/serial.h
 vm_dump.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 vm_dump.$(OBJEXT): $(top_srcdir)/internal/variable.h
@@ -20049,6 +20090,7 @@ vm_sync.$(OBJEXT): $(top_srcdir)/internal/basic_operators.h
 vm_sync.$(OBJEXT): $(top_srcdir)/internal/compilers.h
 vm_sync.$(OBJEXT): $(top_srcdir)/internal/gc.h
 vm_sync.$(OBJEXT): $(top_srcdir)/internal/imemo.h
+vm_sync.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 vm_sync.$(OBJEXT): $(top_srcdir)/internal/serial.h
 vm_sync.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 vm_sync.$(OBJEXT): $(top_srcdir)/internal/thread.h
@@ -20257,6 +20299,7 @@ vm_trace.$(OBJEXT): $(top_srcdir)/internal/compilers.h
 vm_trace.$(OBJEXT): $(top_srcdir)/internal/gc.h
 vm_trace.$(OBJEXT): $(top_srcdir)/internal/hash.h
 vm_trace.$(OBJEXT): $(top_srcdir)/internal/imemo.h
+vm_trace.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
 vm_trace.$(OBJEXT): $(top_srcdir)/internal/serial.h
 vm_trace.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
 vm_trace.$(OBJEXT): $(top_srcdir)/internal/symbol.h

ext/objspace/depend

@@ -182,6 +182,7 @@ object_tracing.o: $(top_srcdir)/internal/basic_operators.h
 object_tracing.o: $(top_srcdir)/internal/compilers.h
 object_tracing.o: $(top_srcdir)/internal/gc.h
 object_tracing.o: $(top_srcdir)/internal/imemo.h
+object_tracing.o: $(top_srcdir)/internal/sanitizers.h
 object_tracing.o: $(top_srcdir)/internal/serial.h
 object_tracing.o: $(top_srcdir)/internal/static_assert.h
 object_tracing.o: $(top_srcdir)/internal/vm.h

ext/ripper/depend

@@ -593,6 +593,7 @@ ripper.o: $(top_srcdir)/internal/parse.h
 ripper.o: $(top_srcdir)/internal/rational.h
 ripper.o: $(top_srcdir)/internal/re.h
 ripper.o: $(top_srcdir)/internal/ruby_parser.h
+ripper.o: $(top_srcdir)/internal/sanitizers.h
 ripper.o: $(top_srcdir)/internal/serial.h
 ripper.o: $(top_srcdir)/internal/static_assert.h
 ripper.o: $(top_srcdir)/internal/string.h

ext/socket/depend

@@ -199,6 +199,7 @@ ancdata.o: $(top_srcdir)/internal/error.h
 ancdata.o: $(top_srcdir)/internal/gc.h
 ancdata.o: $(top_srcdir)/internal/imemo.h
 ancdata.o: $(top_srcdir)/internal/io.h
+ancdata.o: $(top_srcdir)/internal/sanitizers.h
 ancdata.o: $(top_srcdir)/internal/serial.h
 ancdata.o: $(top_srcdir)/internal/static_assert.h
 ancdata.o: $(top_srcdir)/internal/string.h
@@ -408,6 +409,7 @@ basicsocket.o: $(top_srcdir)/internal/error.h
 basicsocket.o: $(top_srcdir)/internal/gc.h
 basicsocket.o: $(top_srcdir)/internal/imemo.h
 basicsocket.o: $(top_srcdir)/internal/io.h
+basicsocket.o: $(top_srcdir)/internal/sanitizers.h
 basicsocket.o: $(top_srcdir)/internal/serial.h
 basicsocket.o: $(top_srcdir)/internal/static_assert.h
 basicsocket.o: $(top_srcdir)/internal/string.h
@@ -617,6 +619,7 @@ constants.o: $(top_srcdir)/internal/error.h
 constants.o: $(top_srcdir)/internal/gc.h
 constants.o: $(top_srcdir)/internal/imemo.h
 constants.o: $(top_srcdir)/internal/io.h
+constants.o: $(top_srcdir)/internal/sanitizers.h
 constants.o: $(top_srcdir)/internal/serial.h
 constants.o: $(top_srcdir)/internal/static_assert.h
 constants.o: $(top_srcdir)/internal/string.h
@@ -827,6 +830,7 @@ ifaddr.o: $(top_srcdir)/internal/error.h
 ifaddr.o: $(top_srcdir)/internal/gc.h
 ifaddr.o: $(top_srcdir)/internal/imemo.h
 ifaddr.o: $(top_srcdir)/internal/io.h
+ifaddr.o: $(top_srcdir)/internal/sanitizers.h
 ifaddr.o: $(top_srcdir)/internal/serial.h
 ifaddr.o: $(top_srcdir)/internal/static_assert.h
 ifaddr.o: $(top_srcdir)/internal/string.h
@@ -1036,6 +1040,7 @@ init.o: $(top_srcdir)/internal/error.h
 init.o: $(top_srcdir)/internal/gc.h
 init.o: $(top_srcdir)/internal/imemo.h
 init.o: $(top_srcdir)/internal/io.h
+init.o: $(top_srcdir)/internal/sanitizers.h
 init.o: $(top_srcdir)/internal/serial.h
 init.o: $(top_srcdir)/internal/static_assert.h
 init.o: $(top_srcdir)/internal/string.h
@@ -1245,6 +1250,7 @@ ipsocket.o: $(top_srcdir)/internal/error.h
 ipsocket.o: $(top_srcdir)/internal/gc.h
 ipsocket.o: $(top_srcdir)/internal/imemo.h
 ipsocket.o: $(top_srcdir)/internal/io.h
+ipsocket.o: $(top_srcdir)/internal/sanitizers.h
 ipsocket.o: $(top_srcdir)/internal/serial.h
 ipsocket.o: $(top_srcdir)/internal/static_assert.h
 ipsocket.o: $(top_srcdir)/internal/string.h
@@ -1454,6 +1460,7 @@ option.o: $(top_srcdir)/internal/error.h
 option.o: $(top_srcdir)/internal/gc.h
 option.o: $(top_srcdir)/internal/imemo.h
 option.o: $(top_srcdir)/internal/io.h
+option.o: $(top_srcdir)/internal/sanitizers.h
 option.o: $(top_srcdir)/internal/serial.h
 option.o: $(top_srcdir)/internal/static_assert.h
 option.o: $(top_srcdir)/internal/string.h
@@ -1663,6 +1670,7 @@ raddrinfo.o: $(top_srcdir)/internal/error.h
 raddrinfo.o: $(top_srcdir)/internal/gc.h
 raddrinfo.o: $(top_srcdir)/internal/imemo.h
 raddrinfo.o: $(top_srcdir)/internal/io.h
+raddrinfo.o: $(top_srcdir)/internal/sanitizers.h
 raddrinfo.o: $(top_srcdir)/internal/serial.h
 raddrinfo.o: $(top_srcdir)/internal/static_assert.h
 raddrinfo.o: $(top_srcdir)/internal/string.h
@@ -1872,6 +1880,7 @@ socket.o: $(top_srcdir)/internal/error.h
 socket.o: $(top_srcdir)/internal/gc.h
 socket.o: $(top_srcdir)/internal/imemo.h
 socket.o: $(top_srcdir)/internal/io.h
+socket.o: $(top_srcdir)/internal/sanitizers.h
 socket.o: $(top_srcdir)/internal/serial.h
 socket.o: $(top_srcdir)/internal/static_assert.h
 socket.o: $(top_srcdir)/internal/string.h
@@ -2081,6 +2090,7 @@ sockssocket.o: $(top_srcdir)/internal/error.h
 sockssocket.o: $(top_srcdir)/internal/gc.h
 sockssocket.o: $(top_srcdir)/internal/imemo.h
 sockssocket.o: $(top_srcdir)/internal/io.h
+sockssocket.o: $(top_srcdir)/internal/sanitizers.h
 sockssocket.o: $(top_srcdir)/internal/serial.h
 sockssocket.o: $(top_srcdir)/internal/static_assert.h
 sockssocket.o: $(top_srcdir)/internal/string.h
@@ -2290,6 +2300,7 @@ tcpserver.o: $(top_srcdir)/internal/error.h
 tcpserver.o: $(top_srcdir)/internal/gc.h
 tcpserver.o: $(top_srcdir)/internal/imemo.h
 tcpserver.o: $(top_srcdir)/internal/io.h
+tcpserver.o: $(top_srcdir)/internal/sanitizers.h
 tcpserver.o: $(top_srcdir)/internal/serial.h
 tcpserver.o: $(top_srcdir)/internal/static_assert.h
 tcpserver.o: $(top_srcdir)/internal/string.h
@@ -2499,6 +2510,7 @@ tcpsocket.o: $(top_srcdir)/internal/error.h
 tcpsocket.o: $(top_srcdir)/internal/gc.h
 tcpsocket.o: $(top_srcdir)/internal/imemo.h
 tcpsocket.o: $(top_srcdir)/internal/io.h
+tcpsocket.o: $(top_srcdir)/internal/sanitizers.h
 tcpsocket.o: $(top_srcdir)/internal/serial.h
 tcpsocket.o: $(top_srcdir)/internal/static_assert.h
 tcpsocket.o: $(top_srcdir)/internal/string.h
@@ -2708,6 +2720,7 @@ udpsocket.o: $(top_srcdir)/internal/error.h
 udpsocket.o: $(top_srcdir)/internal/gc.h
 udpsocket.o: $(top_srcdir)/internal/imemo.h
 udpsocket.o: $(top_srcdir)/internal/io.h
+udpsocket.o: $(top_srcdir)/internal/sanitizers.h
 udpsocket.o: $(top_srcdir)/internal/serial.h
 udpsocket.o: $(top_srcdir)/internal/static_assert.h
 udpsocket.o: $(top_srcdir)/internal/string.h
@@ -2917,6 +2930,7 @@ unixserver.o: $(top_srcdir)/internal/error.h
 unixserver.o: $(top_srcdir)/internal/gc.h
 unixserver.o: $(top_srcdir)/internal/imemo.h
 unixserver.o: $(top_srcdir)/internal/io.h
+unixserver.o: $(top_srcdir)/internal/sanitizers.h
 unixserver.o: $(top_srcdir)/internal/serial.h
 unixserver.o: $(top_srcdir)/internal/static_assert.h
 unixserver.o: $(top_srcdir)/internal/string.h
@@ -3126,6 +3140,7 @@ unixsocket.o: $(top_srcdir)/internal/error.h
 unixsocket.o: $(top_srcdir)/internal/gc.h
 unixsocket.o: $(top_srcdir)/internal/imemo.h
 unixsocket.o: $(top_srcdir)/internal/io.h
+unixsocket.o: $(top_srcdir)/internal/sanitizers.h
 unixsocket.o: $(top_srcdir)/internal/serial.h
 unixsocket.o: $(top_srcdir)/internal/static_assert.h
 unixsocket.o: $(top_srcdir)/internal/string.h

gc.c

@@ -6828,6 +6828,25 @@ static void each_stack_location(rb_objspace_t *objspace, const rb_execution_cont
                                  const VALUE *stack_start, const VALUE *stack_end, void *ctx,
                                  void (*cb)(rb_objspace_t *, void *, VALUE));
 
+static void
+gc_mark_machine_stack_location_maybe(rb_objspace_t *objspace, void *ctx, VALUE obj)
+{
+    gc_mark_maybe(objspace, obj);
+#ifdef RUBY_ASAN_ENABLED
+    rb_execution_context_t *ec = ctx;
+    void *fake_frame_start;
+    void *fake_frame_end;
+    bool is_fake_frame = asan_get_fake_stack_extents(
+        ec->thread_ptr->asan_fake_stack_handle, obj,
+        ec->machine.stack_start, ec->machine.stack_end,
+        &fake_frame_start, &fake_frame_end
+    );
+    if (is_fake_frame) {
+        each_stack_location(objspace, ec, fake_frame_start, fake_frame_end, NULL, gc_mark_maybe_cb);
+    }
+#endif
+}
+
 #if defined(__wasm__)
 
 
@@ -6846,10 +6865,10 @@ static void
 mark_current_machine_context(rb_objspace_t *objspace, rb_execution_context_t *ec)
 {
     emscripten_scan_stack(rb_mark_locations);
-    each_stack_location(objspace, ec, rb_stack_range_tmp[0], rb_stack_range_tmp[1], gc_mark_maybe_cb);
+    each_stack_location(objspace, ec, rb_stack_range_tmp[0], rb_stack_range_tmp[1], NULL, gc_mark_maybe_cb);
 
     emscripten_scan_registers(rb_mark_locations);
-    each_stack_location(objspace, ec, rb_stack_range_tmp[0], rb_stack_range_tmp[1], gc_mark_maybe_cb);
+    each_stack_location(objspace, ec, rb_stack_range_tmp[0], rb_stack_range_tmp[1], NULL, gc_mark_maybe_cb);
 }
 # else // use Asyncify version
 
@@ -6859,10 +6878,10 @@ mark_current_machine_context(rb_objspace_t *objspace, rb_execution_context_t *ec
     VALUE *stack_start, *stack_end;
     SET_STACK_END;
     GET_STACK_BOUNDS(stack_start, stack_end, 1);
-    each_stack_location(objspace, ec, stack_start, stack_end, gc_mark_maybe_cb);
+    each_stack_location(objspace, ec, stack_start, stack_end, NULL, gc_mark_maybe_cb);
 
     rb_wasm_scan_locals(rb_mark_locations);
-    each_stack_location(objspace, ec, rb_stack_range_tmp[0], rb_stack_range_tmp[1], gc_mark_maybe_cb);
+    each_stack_location(objspace, ec, rb_stack_range_tmp[0], rb_stack_range_tmp[1], NULL, gc_mark_maybe_cb);
 }
 
 # endif
@@ -6889,9 +6908,9 @@ mark_current_machine_context(rb_objspace_t *objspace, rb_execution_context_t *ec
     SET_STACK_END;
     GET_STACK_BOUNDS(stack_start, stack_end, 1);
 
-    each_location(objspace, save_regs_gc_mark.v, numberof(save_regs_gc_mark.v), NULL, gc_mark_maybe_cb);
+    each_location(objspace, save_regs_gc_mark.v, numberof(save_regs_gc_mark.v), (void *)ec, gc_mark_machine_stack_location_maybe);
 
-    each_stack_location(objspace, ec, stack_start, stack_end, NULL, gc_mark_maybe_cb);
+    each_stack_location(objspace, ec, stack_start, stack_end, (void *)ec, gc_mark_machine_stack_location_maybe);
 }
 #endif
 
@@ -6909,7 +6928,7 @@ each_machine_stack_value(const rb_execution_context_t *ec, void *ctx, void (*cb)
 void
 rb_gc_mark_machine_stack(const rb_execution_context_t *ec)
 {
-    each_machine_stack_value(ec, NULL, gc_mark_maybe_cb);
+    each_machine_stack_value(ec, (void *)ec, gc_mark_machine_stack_location_maybe);
 }
 
 static void

internal/sanitizers.h

@@ -213,4 +213,67 @@ asan_get_real_stack_addr(void* slot)
     return addr ? addr : slot;
 }
 
+/*!
+ * Gets the current thread's fake stack handle, which can be passed into get_fake_stack_extents
+ *
+ * \retval An opaque value which can be passed to asan_get_fake_stack_extents
+ */
+static inline void *
+asan_get_thread_fake_stack_handle(void)
+{
+    return __asan_get_current_fake_stack();
+}
+
+/*!
+ * Checks if the given VALUE _actually_ represents a pointer to an ASAN fake stack.
+ *
+ * If the given slot _is_ actually a reference to an ASAN fake stack, and that fake stack
+ * contains the real values for the passed-in range of machine stack addresses, returns true
+ * and the range of the fake stack through the outparams.
+ *
+ * Otherwise, returns false, and sets the outparams to NULL.
+ *
+ * Note that this function expects "start" to be > "end" on downward-growing stack architectures;
+ *
+ * \param[in]  thread_fake_stack_handle  The asan fake stack reference for the thread we're scanning
+ * \param[in]  slot                      The value on the machine stack we want to inspect
+ * \param[in]  machine_stack_start       The extents of the real machine stack on which slot lives
+ * \param[in]  machine_stack_end         The extents of the real machine stack on which slot lives
+ * \param[out] fake_stack_start_out      The extents of the fake stack which contains real VALUEs
+ * \param[out] fake_stack_end_out        The extents of the fake stack which contains real VALUEs
+ * \return                               Whether slot is a pointer to a fake stack for the given machine stack range
+*/
+
+static inline bool
+asan_get_fake_stack_extents(void *thread_fake_stack_handle, VALUE slot,
+                            void *machine_stack_start, void *machine_stack_end,
+                            void **fake_stack_start_out, void **fake_stack_end_out)
+{
+    /* the ifdef is needed here to suppress a warning about fake_frame_{start/end} being
+       uninitialized if __asan_addr_is_in_fake_stack is an empty macro */
+#ifdef RUBY_ASAN_ENABLED
+    void *fake_frame_start;
+    void *fake_frame_end;
+    void *real_stack_frame = __asan_addr_is_in_fake_stack(
+        thread_fake_stack_handle, (void *)slot, &fake_frame_start, &fake_frame_end
+    );
+    if (real_stack_frame) {
+        bool in_range;
+#if STACK_GROW_DIRECTION < 0
+        in_range = machine_stack_start >= real_stack_frame && real_stack_frame >= machine_stack_end;
+#else
+        in_range = machine_stack_start <= real_stack_frame && real_stack_frame <= machine_stack_end;
+#endif
+        if (in_range) {
+            *fake_stack_start_out = fake_frame_start;
+            *fake_stack_end_out = fake_frame_end;
+            return true;
+        }
+    }
+#endif
+    *fake_stack_start_out = 0;
+    *fake_stack_end_out = 0;
+    return false;
+}
+
 #endif /* INTERNAL_SANITIZERS_H */

thread.c

@@ -525,6 +525,9 @@ void
 ruby_thread_init_stack(rb_thread_t *th, void *local_in_parent_frame)
 {
     native_thread_init_stack(th, local_in_parent_frame);
+#ifdef RUBY_ASAN_ENABLED
+    th->asan_fake_stack_handle = asan_get_thread_fake_stack_handle();
+#endif
 }
 
 const VALUE *

vm_core.h

@@ -94,6 +94,7 @@ extern int ruby_assert_critical_section_entered;
 #include "internal.h"
 #include "internal/array.h"
 #include "internal/basic_operators.h"
+#include "internal/sanitizers.h"
 #include "internal/serial.h"
 #include "internal/vm.h"
 #include "method.h"
@@ -1155,6 +1156,10 @@ typedef struct rb_thread_struct {
     void **specific_storage;
 
     struct rb_ext_config ext_config;
+
+#ifdef RUBY_ASAN_ENABLED
+    void *asan_fake_stack_handle;
+#endif
 } rb_thread_t;
 
 static inline unsigned int