1# Test that when the coordinator experiences an I/O error communicating
2# with a worker, the coordinator stops the worker and reports the error.
3# The coordinator should not record a crasher.
4#
5# We simulate an I/O error in the test by writing garbage to fuzz_out.
6# This is unlikely, but possible. It's difficult to simulate interruptions
7# due to ^C and EOF errors which are more common. We don't report those.
8[short] skip
9[!fuzz] skip
10env GOCACHE=$WORK/cache
11
12# If the I/O error occurs before F.Fuzz is called, the coordinator should
13# stop the worker and say that.
14! go test -fuzz=FuzzClosePipeBefore -parallel=1
15stdout '\s*fuzzing process terminated without fuzzing:'
16! stdout 'communicating with fuzzing process'
17! exists testdata
18
19# If the I/O error occurs after F.Fuzz is called (unlikely), just exit.
20# It's hard to distinguish this case from the worker being interrupted by ^C
21# or exiting with status 0 (which it should do when interrupted by ^C).
22! go test -fuzz=FuzzClosePipeAfter -parallel=1
23stdout '^\s*communicating with fuzzing process: invalid character ''!'' looking for beginning of value$'
24! exists testdata
25
26-- go.mod --
27module test
28
29go 1.17
30-- io_error_test.go --
31package io_error
32
33import (
34 "flag"
35 "testing"
36 "time"
37)
38
39func isWorker() bool {
40 f := flag.Lookup("test.fuzzworker")
41 if f == nil {
42 return false
43 }
44 get, ok := f.Value.(flag.Getter)
45 if !ok {
46 return false
47 }
48 return get.Get() == interface{}(true)
49}
50
51func FuzzClosePipeBefore(f *testing.F) {
52 if isWorker() {
53 sendGarbageToCoordinator(f)
54 time.Sleep(3600 * time.Second) // pause until coordinator terminates the process
55 }
56 f.Fuzz(func(*testing.T, []byte) {})
57}
58
59func FuzzClosePipeAfter(f *testing.F) {
60 f.Fuzz(func(t *testing.T, _ []byte) {
61 if isWorker() {
62 sendGarbageToCoordinator(t)
63 time.Sleep(3600 * time.Second) // pause until coordinator terminates the process
64 }
65 })
66}
67-- io_error_windows_test.go --
68package io_error
69
70import (
71 "fmt"
72 "os"
73 "testing"
74)
75
76func sendGarbageToCoordinator(tb testing.TB) {
77 v := os.Getenv("GO_TEST_FUZZ_WORKER_HANDLES")
78 var fuzzInFD, fuzzOutFD uintptr
79 if _, err := fmt.Sscanf(v, "%x,%x", &fuzzInFD, &fuzzOutFD); err != nil {
80 tb.Fatalf("parsing GO_TEST_FUZZ_WORKER_HANDLES: %v", err)
81 }
82 f := os.NewFile(fuzzOutFD, "fuzz_out")
83 if _, err := f.Write([]byte("!!")); err != nil {
84 tb.Fatalf("writing fuzz_out: %v", err)
85 }
86}
87-- io_error_notwindows_test.go --
88// +build !windows
89
90package io_error
91
92import (
93 "os"
94 "testing"
95)
96
97func sendGarbageToCoordinator(tb testing.TB) {
98 f := os.NewFile(4, "fuzz_out")
99 if _, err := f.Write([]byte("!!")); err != nil {
100 tb.Fatalf("writing fuzz_out: %v", err)
101 }
102}
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