1 files changed, 89 insertions, 0 deletions
diff --git a/test/fixedbugs/issue11656.go b/test/fixedbugs/issue11656.go
new file mode 100644
index 0000000..85fe720
--- /dev/null
+++ b/test/fixedbugs/issue11656.go
@@ -0,0 +1,89 @@
+// run
+
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// windows doesn't work, because Windows exception handling
+// delivers signals based on the current PC, and that current PC
+// doesn't go into the Go runtime.
+// +build !windows
+
+// wasm does not work, because the linear memory is not executable.
+// +build !wasm
+
+// This test doesn't work on gccgo/GoLLVM, because they will not find
+// any unwind information for the artificial function, and will not be
+// able to unwind past that point.
+// +build !gccgo
+
+package main
+
+import (
+	"encoding/binary"
+	"runtime"
+	"runtime/debug"
+	"unsafe"
+)
+
+func main() {
+	debug.SetPanicOnFault(true)
+	defer func() {
+		if err := recover(); err == nil {
+			panic("not panicking")
+		}
+		pc, _, _, _ := runtime.Caller(10)
+		f := runtime.FuncForPC(pc)
+		if f == nil || f.Name() != "main.f" {
+			if f == nil {
+				println("no func for ", unsafe.Pointer(pc))
+			} else {
+				println("found func:", f.Name())
+			}
+			panic("cannot find main.f on stack")
+		}
+	}()
+	f(20)
+}
+
+func f(n int) {
+	if n > 0 {
+		f(n - 1)
+	}
+	var f struct {
+		x uintptr
+	}
+
+	// We want to force a seg fault, to get a crash at a PC value != 0.
+	// Not all systems make the data section non-executable.
+	ill := make([]byte, 64)
+	switch runtime.GOARCH {
+	case "386", "amd64":
+		ill = append(ill[:0], 0x89, 0x04, 0x25, 0x00, 0x00, 0x00, 0x00) // MOVL AX, 0
+	case "arm":
+		binary.LittleEndian.PutUint32(ill[0:4], 0xe3a00000) // MOVW $0, R0
+		binary.LittleEndian.PutUint32(ill[4:8], 0xe5800000) // MOVW R0, (R0)
+	case "arm64":
+		binary.LittleEndian.PutUint32(ill, 0xf90003ff) // MOVD ZR, (ZR)
+	case "ppc64":
+		binary.BigEndian.PutUint32(ill, 0xf8000000) // MOVD R0, (R0)
+	case "ppc64le":
+		binary.LittleEndian.PutUint32(ill, 0xf8000000) // MOVD R0, (R0)
+	case "mips", "mips64":
+		binary.BigEndian.PutUint32(ill, 0xfc000000) // MOVV R0, (R0)
+	case "mipsle", "mips64le":
+		binary.LittleEndian.PutUint32(ill, 0xfc000000) // MOVV R0, (R0)
+	case "s390x":
+		ill = append(ill[:0], 0xa7, 0x09, 0x00, 0x00)         // MOVD $0, R0
+		ill = append(ill, 0xe3, 0x00, 0x00, 0x00, 0x00, 0x24) // MOVD R0, (R0)
+	case "riscv64":
+		binary.LittleEndian.PutUint32(ill, 0x00003023) // MOV X0, (X0)
+	default:
+		// Just leave it as 0 and hope for the best.
+	}
+
+	f.x = uintptr(unsafe.Pointer(&ill[0]))
+	p := &f
+	fn := *(*func())(unsafe.Pointer(&p))
+	fn()
+}