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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:23:18 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:23:18 +0000 |
commit | 43a123c1ae6613b3efeed291fa552ecd909d3acf (patch) | |
tree | fd92518b7024bc74031f78a1cf9e454b65e73665 /src/runtime/crash_test.go | |
parent | Initial commit. (diff) | |
download | golang-1.20-43a123c1ae6613b3efeed291fa552ecd909d3acf.tar.xz golang-1.20-43a123c1ae6613b3efeed291fa552ecd909d3acf.zip |
Adding upstream version 1.20.14.upstream/1.20.14upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/runtime/crash_test.go')
-rw-r--r-- | src/runtime/crash_test.go | 868 |
1 files changed, 868 insertions, 0 deletions
diff --git a/src/runtime/crash_test.go b/src/runtime/crash_test.go new file mode 100644 index 0000000..309777d --- /dev/null +++ b/src/runtime/crash_test.go @@ -0,0 +1,868 @@ +// Copyright 2012 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. + +package runtime_test + +import ( + "bytes" + "errors" + "flag" + "fmt" + "internal/testenv" + "os" + "os/exec" + "path/filepath" + "regexp" + "runtime" + "strings" + "sync" + "testing" + "time" +) + +var toRemove []string + +func TestMain(m *testing.M) { + status := m.Run() + for _, file := range toRemove { + os.RemoveAll(file) + } + os.Exit(status) +} + +var testprog struct { + sync.Mutex + dir string + target map[string]*buildexe +} + +type buildexe struct { + once sync.Once + exe string + err error +} + +func runTestProg(t *testing.T, binary, name string, env ...string) string { + if *flagQuick { + t.Skip("-quick") + } + + testenv.MustHaveGoBuild(t) + + exe, err := buildTestProg(t, binary) + if err != nil { + t.Fatal(err) + } + + return runBuiltTestProg(t, exe, name, env...) +} + +func runBuiltTestProg(t *testing.T, exe, name string, env ...string) string { + t.Helper() + + if *flagQuick { + t.Skip("-quick") + } + + start := time.Now() + + cmd := testenv.CleanCmdEnv(testenv.Command(t, exe, name)) + cmd.Env = append(cmd.Env, env...) + if testing.Short() { + cmd.Env = append(cmd.Env, "RUNTIME_TEST_SHORT=1") + } + out, err := cmd.CombinedOutput() + if err == nil { + t.Logf("%v (%v): ok", cmd, time.Since(start)) + } else { + if _, ok := err.(*exec.ExitError); ok { + t.Logf("%v: %v", cmd, err) + } else if errors.Is(err, exec.ErrWaitDelay) { + t.Fatalf("%v: %v", cmd, err) + } else { + t.Fatalf("%v failed to start: %v", cmd, err) + } + } + return string(out) +} + +var serializeBuild = make(chan bool, 2) + +func buildTestProg(t *testing.T, binary string, flags ...string) (string, error) { + if *flagQuick { + t.Skip("-quick") + } + testenv.MustHaveGoBuild(t) + + testprog.Lock() + if testprog.dir == "" { + dir, err := os.MkdirTemp("", "go-build") + if err != nil { + t.Fatalf("failed to create temp directory: %v", err) + } + testprog.dir = dir + toRemove = append(toRemove, dir) + } + + if testprog.target == nil { + testprog.target = make(map[string]*buildexe) + } + name := binary + if len(flags) > 0 { + name += "_" + strings.Join(flags, "_") + } + target, ok := testprog.target[name] + if !ok { + target = &buildexe{} + testprog.target[name] = target + } + + dir := testprog.dir + + // Unlock testprog while actually building, so that other + // tests can look up executables that were already built. + testprog.Unlock() + + target.once.Do(func() { + // Only do two "go build"'s at a time, + // to keep load from getting too high. + serializeBuild <- true + defer func() { <-serializeBuild }() + + // Don't get confused if testenv.GoToolPath calls t.Skip. + target.err = errors.New("building test called t.Skip") + + exe := filepath.Join(dir, name+".exe") + + t.Logf("running go build -o %s %s", exe, strings.Join(flags, " ")) + cmd := exec.Command(testenv.GoToolPath(t), append([]string{"build", "-o", exe}, flags...)...) + cmd.Dir = "testdata/" + binary + out, err := testenv.CleanCmdEnv(cmd).CombinedOutput() + if err != nil { + target.err = fmt.Errorf("building %s %v: %v\n%s", binary, flags, err, out) + } else { + target.exe = exe + target.err = nil + } + }) + + return target.exe, target.err +} + +func TestVDSO(t *testing.T) { + t.Parallel() + output := runTestProg(t, "testprog", "SignalInVDSO") + want := "success\n" + if output != want { + t.Fatalf("output:\n%s\n\nwanted:\n%s", output, want) + } +} + +func testCrashHandler(t *testing.T, cgo bool) { + type crashTest struct { + Cgo bool + } + var output string + if cgo { + output = runTestProg(t, "testprogcgo", "Crash") + } else { + output = runTestProg(t, "testprog", "Crash") + } + want := "main: recovered done\nnew-thread: recovered done\nsecond-new-thread: recovered done\nmain-again: recovered done\n" + if output != want { + t.Fatalf("output:\n%s\n\nwanted:\n%s", output, want) + } +} + +func TestCrashHandler(t *testing.T) { + testCrashHandler(t, false) +} + +func testDeadlock(t *testing.T, name string) { + // External linking brings in cgo, causing deadlock detection not working. + testenv.MustInternalLink(t) + + output := runTestProg(t, "testprog", name) + want := "fatal error: all goroutines are asleep - deadlock!\n" + if !strings.HasPrefix(output, want) { + t.Fatalf("output does not start with %q:\n%s", want, output) + } +} + +func TestSimpleDeadlock(t *testing.T) { + testDeadlock(t, "SimpleDeadlock") +} + +func TestInitDeadlock(t *testing.T) { + testDeadlock(t, "InitDeadlock") +} + +func TestLockedDeadlock(t *testing.T) { + testDeadlock(t, "LockedDeadlock") +} + +func TestLockedDeadlock2(t *testing.T) { + testDeadlock(t, "LockedDeadlock2") +} + +func TestGoexitDeadlock(t *testing.T) { + // External linking brings in cgo, causing deadlock detection not working. + testenv.MustInternalLink(t) + + output := runTestProg(t, "testprog", "GoexitDeadlock") + want := "no goroutines (main called runtime.Goexit) - deadlock!" + if !strings.Contains(output, want) { + t.Fatalf("output:\n%s\n\nwant output containing: %s", output, want) + } +} + +func TestStackOverflow(t *testing.T) { + output := runTestProg(t, "testprog", "StackOverflow") + want := []string{ + "runtime: goroutine stack exceeds 1474560-byte limit\n", + "fatal error: stack overflow", + // information about the current SP and stack bounds + "runtime: sp=", + "stack=[", + } + if !strings.HasPrefix(output, want[0]) { + t.Errorf("output does not start with %q", want[0]) + } + for _, s := range want[1:] { + if !strings.Contains(output, s) { + t.Errorf("output does not contain %q", s) + } + } + if t.Failed() { + t.Logf("output:\n%s", output) + } +} + +func TestThreadExhaustion(t *testing.T) { + output := runTestProg(t, "testprog", "ThreadExhaustion") + want := "runtime: program exceeds 10-thread limit\nfatal error: thread exhaustion" + if !strings.HasPrefix(output, want) { + t.Fatalf("output does not start with %q:\n%s", want, output) + } +} + +func TestRecursivePanic(t *testing.T) { + output := runTestProg(t, "testprog", "RecursivePanic") + want := `wrap: bad +panic: again + +` + if !strings.HasPrefix(output, want) { + t.Fatalf("output does not start with %q:\n%s", want, output) + } + +} + +func TestRecursivePanic2(t *testing.T) { + output := runTestProg(t, "testprog", "RecursivePanic2") + want := `first panic +second panic +panic: third panic + +` + if !strings.HasPrefix(output, want) { + t.Fatalf("output does not start with %q:\n%s", want, output) + } + +} + +func TestRecursivePanic3(t *testing.T) { + output := runTestProg(t, "testprog", "RecursivePanic3") + want := `panic: first panic + +` + if !strings.HasPrefix(output, want) { + t.Fatalf("output does not start with %q:\n%s", want, output) + } + +} + +func TestRecursivePanic4(t *testing.T) { + output := runTestProg(t, "testprog", "RecursivePanic4") + want := `panic: first panic [recovered] + panic: second panic +` + if !strings.HasPrefix(output, want) { + t.Fatalf("output does not start with %q:\n%s", want, output) + } + +} + +func TestRecursivePanic5(t *testing.T) { + output := runTestProg(t, "testprog", "RecursivePanic5") + want := `first panic +second panic +panic: third panic +` + if !strings.HasPrefix(output, want) { + t.Fatalf("output does not start with %q:\n%s", want, output) + } + +} + +func TestGoexitCrash(t *testing.T) { + // External linking brings in cgo, causing deadlock detection not working. + testenv.MustInternalLink(t) + + output := runTestProg(t, "testprog", "GoexitExit") + want := "no goroutines (main called runtime.Goexit) - deadlock!" + if !strings.Contains(output, want) { + t.Fatalf("output:\n%s\n\nwant output containing: %s", output, want) + } +} + +func TestGoexitDefer(t *testing.T) { + c := make(chan struct{}) + go func() { + defer func() { + r := recover() + if r != nil { + t.Errorf("non-nil recover during Goexit") + } + c <- struct{}{} + }() + runtime.Goexit() + }() + // Note: if the defer fails to run, we will get a deadlock here + <-c +} + +func TestGoNil(t *testing.T) { + output := runTestProg(t, "testprog", "GoNil") + want := "go of nil func value" + if !strings.Contains(output, want) { + t.Fatalf("output:\n%s\n\nwant output containing: %s", output, want) + } +} + +func TestMainGoroutineID(t *testing.T) { + output := runTestProg(t, "testprog", "MainGoroutineID") + want := "panic: test\n\ngoroutine 1 [running]:\n" + if !strings.HasPrefix(output, want) { + t.Fatalf("output does not start with %q:\n%s", want, output) + } +} + +func TestNoHelperGoroutines(t *testing.T) { + output := runTestProg(t, "testprog", "NoHelperGoroutines") + matches := regexp.MustCompile(`goroutine [0-9]+ \[`).FindAllStringSubmatch(output, -1) + if len(matches) != 1 || matches[0][0] != "goroutine 1 [" { + t.Fatalf("want to see only goroutine 1, see:\n%s", output) + } +} + +func TestBreakpoint(t *testing.T) { + output := runTestProg(t, "testprog", "Breakpoint") + // If runtime.Breakpoint() is inlined, then the stack trace prints + // "runtime.Breakpoint(...)" instead of "runtime.Breakpoint()". + want := "runtime.Breakpoint(" + if !strings.Contains(output, want) { + t.Fatalf("output:\n%s\n\nwant output containing: %s", output, want) + } +} + +func TestGoexitInPanic(t *testing.T) { + // External linking brings in cgo, causing deadlock detection not working. + testenv.MustInternalLink(t) + + // see issue 8774: this code used to trigger an infinite recursion + output := runTestProg(t, "testprog", "GoexitInPanic") + want := "fatal error: no goroutines (main called runtime.Goexit) - deadlock!" + if !strings.HasPrefix(output, want) { + t.Fatalf("output does not start with %q:\n%s", want, output) + } +} + +// Issue 14965: Runtime panics should be of type runtime.Error +func TestRuntimePanicWithRuntimeError(t *testing.T) { + testCases := [...]func(){ + 0: func() { + var m map[uint64]bool + m[1234] = true + }, + 1: func() { + ch := make(chan struct{}) + close(ch) + close(ch) + }, + 2: func() { + var ch = make(chan struct{}) + close(ch) + ch <- struct{}{} + }, + 3: func() { + var s = make([]int, 2) + _ = s[2] + }, + 4: func() { + n := -1 + _ = make(chan bool, n) + }, + 5: func() { + close((chan bool)(nil)) + }, + } + + for i, fn := range testCases { + got := panicValue(fn) + if _, ok := got.(runtime.Error); !ok { + t.Errorf("test #%d: recovered value %v(type %T) does not implement runtime.Error", i, got, got) + } + } +} + +func panicValue(fn func()) (recovered any) { + defer func() { + recovered = recover() + }() + fn() + return +} + +func TestPanicAfterGoexit(t *testing.T) { + // an uncaught panic should still work after goexit + output := runTestProg(t, "testprog", "PanicAfterGoexit") + want := "panic: hello" + if !strings.HasPrefix(output, want) { + t.Fatalf("output does not start with %q:\n%s", want, output) + } +} + +func TestRecoveredPanicAfterGoexit(t *testing.T) { + // External linking brings in cgo, causing deadlock detection not working. + testenv.MustInternalLink(t) + + output := runTestProg(t, "testprog", "RecoveredPanicAfterGoexit") + want := "fatal error: no goroutines (main called runtime.Goexit) - deadlock!" + if !strings.HasPrefix(output, want) { + t.Fatalf("output does not start with %q:\n%s", want, output) + } +} + +func TestRecoverBeforePanicAfterGoexit(t *testing.T) { + // External linking brings in cgo, causing deadlock detection not working. + testenv.MustInternalLink(t) + + t.Parallel() + output := runTestProg(t, "testprog", "RecoverBeforePanicAfterGoexit") + want := "fatal error: no goroutines (main called runtime.Goexit) - deadlock!" + if !strings.HasPrefix(output, want) { + t.Fatalf("output does not start with %q:\n%s", want, output) + } +} + +func TestRecoverBeforePanicAfterGoexit2(t *testing.T) { + // External linking brings in cgo, causing deadlock detection not working. + testenv.MustInternalLink(t) + + t.Parallel() + output := runTestProg(t, "testprog", "RecoverBeforePanicAfterGoexit2") + want := "fatal error: no goroutines (main called runtime.Goexit) - deadlock!" + if !strings.HasPrefix(output, want) { + t.Fatalf("output does not start with %q:\n%s", want, output) + } +} + +func TestNetpollDeadlock(t *testing.T) { + t.Parallel() + output := runTestProg(t, "testprognet", "NetpollDeadlock") + want := "done\n" + if !strings.HasSuffix(output, want) { + t.Fatalf("output does not start with %q:\n%s", want, output) + } +} + +func TestPanicTraceback(t *testing.T) { + t.Parallel() + output := runTestProg(t, "testprog", "PanicTraceback") + want := "panic: hello\n\tpanic: panic pt2\n\tpanic: panic pt1\n" + if !strings.HasPrefix(output, want) { + t.Fatalf("output does not start with %q:\n%s", want, output) + } + + // Check functions in the traceback. + fns := []string{"main.pt1.func1", "panic", "main.pt2.func1", "panic", "main.pt2", "main.pt1"} + for _, fn := range fns { + re := regexp.MustCompile(`(?m)^` + regexp.QuoteMeta(fn) + `\(.*\n`) + idx := re.FindStringIndex(output) + if idx == nil { + t.Fatalf("expected %q function in traceback:\n%s", fn, output) + } + output = output[idx[1]:] + } +} + +func testPanicDeadlock(t *testing.T, name string, want string) { + // test issue 14432 + output := runTestProg(t, "testprog", name) + if !strings.HasPrefix(output, want) { + t.Fatalf("output does not start with %q:\n%s", want, output) + } +} + +func TestPanicDeadlockGosched(t *testing.T) { + testPanicDeadlock(t, "GoschedInPanic", "panic: errorThatGosched\n\n") +} + +func TestPanicDeadlockSyscall(t *testing.T) { + testPanicDeadlock(t, "SyscallInPanic", "1\n2\npanic: 3\n\n") +} + +func TestPanicLoop(t *testing.T) { + output := runTestProg(t, "testprog", "PanicLoop") + if want := "panic while printing panic value"; !strings.Contains(output, want) { + t.Errorf("output does not contain %q:\n%s", want, output) + } +} + +func TestMemPprof(t *testing.T) { + testenv.MustHaveGoRun(t) + + exe, err := buildTestProg(t, "testprog") + if err != nil { + t.Fatal(err) + } + + got, err := testenv.CleanCmdEnv(exec.Command(exe, "MemProf")).CombinedOutput() + if err != nil { + t.Fatal(err) + } + fn := strings.TrimSpace(string(got)) + defer os.Remove(fn) + + for try := 0; try < 2; try++ { + cmd := testenv.CleanCmdEnv(exec.Command(testenv.GoToolPath(t), "tool", "pprof", "-alloc_space", "-top")) + // Check that pprof works both with and without explicit executable on command line. + if try == 0 { + cmd.Args = append(cmd.Args, exe, fn) + } else { + cmd.Args = append(cmd.Args, fn) + } + found := false + for i, e := range cmd.Env { + if strings.HasPrefix(e, "PPROF_TMPDIR=") { + cmd.Env[i] = "PPROF_TMPDIR=" + os.TempDir() + found = true + break + } + } + if !found { + cmd.Env = append(cmd.Env, "PPROF_TMPDIR="+os.TempDir()) + } + + top, err := cmd.CombinedOutput() + t.Logf("%s:\n%s", cmd.Args, top) + if err != nil { + t.Error(err) + } else if !bytes.Contains(top, []byte("MemProf")) { + t.Error("missing MemProf in pprof output") + } + } +} + +var concurrentMapTest = flag.Bool("run_concurrent_map_tests", false, "also run flaky concurrent map tests") + +func TestConcurrentMapWrites(t *testing.T) { + if !*concurrentMapTest { + t.Skip("skipping without -run_concurrent_map_tests") + } + testenv.MustHaveGoRun(t) + output := runTestProg(t, "testprog", "concurrentMapWrites") + want := "fatal error: concurrent map writes" + if !strings.HasPrefix(output, want) { + t.Fatalf("output does not start with %q:\n%s", want, output) + } +} +func TestConcurrentMapReadWrite(t *testing.T) { + if !*concurrentMapTest { + t.Skip("skipping without -run_concurrent_map_tests") + } + testenv.MustHaveGoRun(t) + output := runTestProg(t, "testprog", "concurrentMapReadWrite") + want := "fatal error: concurrent map read and map write" + if !strings.HasPrefix(output, want) { + t.Fatalf("output does not start with %q:\n%s", want, output) + } +} +func TestConcurrentMapIterateWrite(t *testing.T) { + if !*concurrentMapTest { + t.Skip("skipping without -run_concurrent_map_tests") + } + testenv.MustHaveGoRun(t) + output := runTestProg(t, "testprog", "concurrentMapIterateWrite") + want := "fatal error: concurrent map iteration and map write" + if !strings.HasPrefix(output, want) { + t.Fatalf("output does not start with %q:\n%s", want, output) + } +} + +type point struct { + x, y *int +} + +func (p *point) negate() { + *p.x = *p.x * -1 + *p.y = *p.y * -1 +} + +// Test for issue #10152. +func TestPanicInlined(t *testing.T) { + defer func() { + r := recover() + if r == nil { + t.Fatalf("recover failed") + } + buf := make([]byte, 2048) + n := runtime.Stack(buf, false) + buf = buf[:n] + if !bytes.Contains(buf, []byte("(*point).negate(")) { + t.Fatalf("expecting stack trace to contain call to (*point).negate()") + } + }() + + pt := new(point) + pt.negate() +} + +// Test for issues #3934 and #20018. +// We want to delay exiting until a panic print is complete. +func TestPanicRace(t *testing.T) { + testenv.MustHaveGoRun(t) + + exe, err := buildTestProg(t, "testprog") + if err != nil { + t.Fatal(err) + } + + // The test is intentionally racy, and in my testing does not + // produce the expected output about 0.05% of the time. + // So run the program in a loop and only fail the test if we + // get the wrong output ten times in a row. + const tries = 10 +retry: + for i := 0; i < tries; i++ { + got, err := testenv.CleanCmdEnv(exec.Command(exe, "PanicRace")).CombinedOutput() + if err == nil { + t.Logf("try %d: program exited successfully, should have failed", i+1) + continue + } + + if i > 0 { + t.Logf("try %d:\n", i+1) + } + t.Logf("%s\n", got) + + wants := []string{ + "panic: crash", + "PanicRace", + "created by ", + } + for _, want := range wants { + if !bytes.Contains(got, []byte(want)) { + t.Logf("did not find expected string %q", want) + continue retry + } + } + + // Test generated expected output. + return + } + t.Errorf("test ran %d times without producing expected output", tries) +} + +func TestBadTraceback(t *testing.T) { + output := runTestProg(t, "testprog", "BadTraceback") + for _, want := range []string{ + "unexpected return pc", + "called from 0xbad", + "00000bad", // Smashed LR in hex dump + "<main.badLR", // Symbolization in hex dump (badLR1 or badLR2) + } { + if !strings.Contains(output, want) { + t.Errorf("output does not contain %q:\n%s", want, output) + } + } +} + +func TestTimePprof(t *testing.T) { + // This test is unreliable on any system in which nanotime + // calls into libc. + switch runtime.GOOS { + case "aix", "darwin", "illumos", "openbsd", "solaris": + t.Skipf("skipping on %s because nanotime calls libc", runtime.GOOS) + } + + // Pass GOTRACEBACK for issue #41120 to try to get more + // information on timeout. + fn := runTestProg(t, "testprog", "TimeProf", "GOTRACEBACK=crash") + fn = strings.TrimSpace(fn) + defer os.Remove(fn) + + cmd := testenv.CleanCmdEnv(exec.Command(testenv.GoToolPath(t), "tool", "pprof", "-top", "-nodecount=1", fn)) + cmd.Env = append(cmd.Env, "PPROF_TMPDIR="+os.TempDir()) + top, err := cmd.CombinedOutput() + t.Logf("%s", top) + if err != nil { + t.Error(err) + } else if bytes.Contains(top, []byte("ExternalCode")) { + t.Error("profiler refers to ExternalCode") + } +} + +// Test that runtime.abort does so. +func TestAbort(t *testing.T) { + // Pass GOTRACEBACK to ensure we get runtime frames. + output := runTestProg(t, "testprog", "Abort", "GOTRACEBACK=system") + if want := "runtime.abort"; !strings.Contains(output, want) { + t.Errorf("output does not contain %q:\n%s", want, output) + } + if strings.Contains(output, "BAD") { + t.Errorf("output contains BAD:\n%s", output) + } + // Check that it's a signal traceback. + want := "PC=" + // For systems that use a breakpoint, check specifically for that. + switch runtime.GOARCH { + case "386", "amd64": + switch runtime.GOOS { + case "plan9": + want = "sys: breakpoint" + case "windows": + want = "Exception 0x80000003" + default: + want = "SIGTRAP" + } + } + if !strings.Contains(output, want) { + t.Errorf("output does not contain %q:\n%s", want, output) + } +} + +// For TestRuntimePanic: test a panic in the runtime package without +// involving the testing harness. +func init() { + if os.Getenv("GO_TEST_RUNTIME_PANIC") == "1" { + defer func() { + if r := recover(); r != nil { + // We expect to crash, so exit 0 + // to indicate failure. + os.Exit(0) + } + }() + runtime.PanicForTesting(nil, 1) + // We expect to crash, so exit 0 to indicate failure. + os.Exit(0) + } +} + +func TestRuntimePanic(t *testing.T) { + testenv.MustHaveExec(t) + cmd := testenv.CleanCmdEnv(exec.Command(os.Args[0], "-test.run=TestRuntimePanic")) + cmd.Env = append(cmd.Env, "GO_TEST_RUNTIME_PANIC=1") + out, err := cmd.CombinedOutput() + t.Logf("%s", out) + if err == nil { + t.Error("child process did not fail") + } else if want := "runtime.unexportedPanicForTesting"; !bytes.Contains(out, []byte(want)) { + t.Errorf("output did not contain expected string %q", want) + } +} + +// Test that g0 stack overflows are handled gracefully. +func TestG0StackOverflow(t *testing.T) { + testenv.MustHaveExec(t) + + switch runtime.GOOS { + case "darwin", "dragonfly", "freebsd", "linux", "netbsd", "openbsd", "android": + t.Skipf("g0 stack is wrong on pthread platforms (see golang.org/issue/26061)") + } + + if os.Getenv("TEST_G0_STACK_OVERFLOW") != "1" { + cmd := testenv.CleanCmdEnv(exec.Command(os.Args[0], "-test.run=TestG0StackOverflow", "-test.v")) + cmd.Env = append(cmd.Env, "TEST_G0_STACK_OVERFLOW=1") + out, err := cmd.CombinedOutput() + // Don't check err since it's expected to crash. + if n := strings.Count(string(out), "morestack on g0\n"); n != 1 { + t.Fatalf("%s\n(exit status %v)", out, err) + } + // Check that it's a signal-style traceback. + if runtime.GOOS != "windows" { + if want := "PC="; !strings.Contains(string(out), want) { + t.Errorf("output does not contain %q:\n%s", want, out) + } + } + return + } + + runtime.G0StackOverflow() +} + +// Test that panic message is not clobbered. +// See issue 30150. +func TestDoublePanic(t *testing.T) { + output := runTestProg(t, "testprog", "DoublePanic", "GODEBUG=clobberfree=1") + wants := []string{"panic: XXX", "panic: YYY"} + for _, want := range wants { + if !strings.Contains(output, want) { + t.Errorf("output:\n%s\n\nwant output containing: %s", output, want) + } + } +} + +// Test that panic while panicking discards error message +// See issue 52257 +func TestPanicWhilePanicking(t *testing.T) { + tests := []struct { + Want string + Func string + }{ + { + "panic while printing panic value: important error message", + "ErrorPanic", + }, + { + "panic while printing panic value: important stringer message", + "StringerPanic", + }, + { + "panic while printing panic value: type", + "DoubleErrorPanic", + }, + { + "panic while printing panic value: type", + "DoubleStringerPanic", + }, + { + "panic while printing panic value: type", + "CircularPanic", + }, + { + "important string message", + "StringPanic", + }, + { + "nil", + "NilPanic", + }, + } + for _, x := range tests { + output := runTestProg(t, "testprog", x.Func) + if !strings.Contains(output, x.Want) { + t.Errorf("output does not contain %q:\n%s", x.Want, output) + } + } +} + +func TestPanicOnUnsafeSlice(t *testing.T) { + output := runTestProg(t, "testprog", "panicOnNilAndEleSizeIsZero") + want := "panic: runtime error: unsafe.Slice: ptr is nil and len is not zero" + if !strings.Contains(output, want) { + t.Errorf("output does not contain %q:\n%s", want, output) + } +} |