wazevo(amd64). fuzz: sigsegv

Signed-off-by: Edoardo Vacchi <[email protected]>

internal/engine/wazevo/wazevoapi/debug_options.go

@@ -33,7 +33,7 @@ const (
 	PrintRegisterAllocated                   = false
 	PrintFinalizedMachineCode                = false
 	PrintMachineCodeHexPerFunction           = printMachineCodeHexPerFunctionUnmodified || PrintMachineCodeHexPerFunctionDisassemblable //nolint
-	printMachineCodeHexPerFunctionUnmodified = false
+	printMachineCodeHexPerFunctionUnmodified = true
 	// PrintMachineCodeHexPerFunctionDisassemblable prints the machine code while modifying the actual result
 	// to make it disassemblable. This is useful when debugging the final machine code. See the places where this is used for detail.
 	// When this is enabled, functions must not be called.

internal/integration_test/fuzzcases/fuzzcases_test.go

@@ -986,3 +986,15 @@ func Test2037(t *testing.T) {
 		require.Equal(t, []uint64{0x0, 0x0, 0xbbbbbbbbbbbbbbbb, 0xbbbbbbbbbbbbbbbb, 0xcb6151c8d497b060, 0xbbbbbbbbbbbbbbbb, 0xe71c3971a22b233b, 0xa0a0a0a0a0a0a0a, 0x0, 0xfffffffb00000030, 0x0, 0x6c6cbbbbbbbbbbbb, 0xfeb44590ef194fa2, 0x1313131313131313, 0x1898a98e9daf4f22, 0xf8f8f8f80a0a0aa0, 0x6c6c6c6c6c6cf1f8, 0x6c6c6c6c6c6c6c6c, 0x9abbbbbbbbbbbb6c, 0x9a9ad39a9a9a9a9a}, res)
 	})
 }
+
+func TestCrash(t *testing.T) {
+	if !platform.CompilerSupported() {
+		return
+	}
+	run(t, func(t *testing.T, r wazero.Runtime) {
+		mod, err := r.Instantiate(ctx, getWasmBinary(t, "crash"))
+		require.NoError(t, err)
+		_, err = mod.ExportedFunction("").Call(ctx, make([]uint64, 1)...)
+		require.NoError(t, err)
+	})
+}

internal/integration_test/fuzzcases/testdata/crash.wat

@@ -0,0 +1,25 @@
+(module
+  (type (;0;) (func (param i32)))
+  (func (;0;) (type 0) (param i32)
+    (local f32)
+    i32.const 988345840
+    f32.convert_i32_s
+    global.get 0
+    f32.max
+    local.tee 1
+    f32.const nan (;=nan;)
+    local.get 1
+    local.get 1
+    f32.eq
+    select
+    i32.reinterpret_f32
+    global.get 1
+    i32.xor
+    global.set 1)
+  (global (;0;) f32 (f32.const 0x1.c8c8c8p+73 (;=1.68524e+22;)))
+  (global (;1;) (mut i32) (i32.const 0))
+  (global (;2;) (mut i32) (i32.const 1000))
+  (export "" (func 0))
+  (export "1" (global 0))
+  (export "2" (global 1))
+  (data (;0;) ""))