func (mgr *Manager) saveCrasher(vmCfg *vm.Config, desc string, text, output []byte) {
if atomic.LoadUint32(&mgr.shutdown) != 0 {
// qemu crashes with "qemu: terminating on signal 2",
// which we detect as "lost connection".
return
}
for _, re := range mgr.suppressions {
if re.Match(output) {
Logf(1, "%v: suppressing '%v' with '%v'", vmCfg.Name, desc, re.String())
mgr.mu.Lock()
mgr.stats["suppressed"]++
mgr.mu.Unlock()
return
}
}
Logf(0, "%v: crash: %v", vmCfg.Name, desc)
mgr.mu.Lock()
mgr.stats["crashes"]++
mgr.mu.Unlock()
h := hash([]byte(desc))
id := hex.EncodeToString(h[:])
dir := filepath.Join(mgr.crashdir, id)
os.MkdirAll(dir, 0700)
if err := ioutil.WriteFile(filepath.Join(dir, "description"), []byte(desc+"\n"), 0660); err != nil {
Logf(0, "failed to write crash: %v", err)
}
// Save up to 100 reports. If we already have 100, overwrite the oldest one.
// Newer reports are generally more useful. Overwriting is also needed
// to be able to understand if a particular bug still happens or already fixed.
oldestI := 0
var oldestTime time.Time
for i := 0; i < 100; i++ {
info, err := os.Stat(filepath.Join(dir, fmt.Sprintf("log%v", i)))
if err != nil {
oldestI = i
break
}
if oldestTime.IsZero() || info.ModTime().Before(oldestTime) {
oldestI = i
oldestTime = info.ModTime()
}
}
ioutil.WriteFile(filepath.Join(dir, fmt.Sprintf("log%v", oldestI)), output, 0660)
if len(mgr.cfg.Tag) > 0 {
ioutil.WriteFile(filepath.Join(dir, fmt.Sprintf("tag%v", oldestI)), []byte(mgr.cfg.Tag), 0660)
}
if len(text) > 0 {
symbolized, err := report.Symbolize(mgr.cfg.Vmlinux, text)
if err != nil {
Logf(0, "failed to symbolize crash: %v", err)
} else {
text = symbolized
}
ioutil.WriteFile(filepath.Join(dir, fmt.Sprintf("report%v", oldestI)), []byte(text), 0660)
}
}
func (mgr *Manager) saveCrash(crash *Crash) {
Logf(0, "%v: crash: %v", crash.vmName, crash.desc)
mgr.mu.Lock()
mgr.stats["crashes"]++
mgr.mu.Unlock()
sig := hash.Hash([]byte(crash.desc))
id := sig.String()
dir := filepath.Join(mgr.crashdir, id)
os.MkdirAll(dir, 0700)
if err := ioutil.WriteFile(filepath.Join(dir, "description"), []byte(crash.desc+"\n"), 0660); err != nil {
Logf(0, "failed to write crash: %v", err)
}
// Save up to 100 reports. If we already have 100, overwrite the oldest one.
// Newer reports are generally more useful. Overwriting is also needed
// to be able to understand if a particular bug still happens or already fixed.
oldestI := 0
var oldestTime time.Time
for i := 0; i < 100; i++ {
info, err := os.Stat(filepath.Join(dir, fmt.Sprintf("log%v", i)))
if err != nil {
oldestI = i
break
}
if oldestTime.IsZero() || info.ModTime().Before(oldestTime) {
oldestI = i
oldestTime = info.ModTime()
}
}
ioutil.WriteFile(filepath.Join(dir, fmt.Sprintf("log%v", oldestI)), crash.output, 0660)
if len(mgr.cfg.Tag) > 0 {
ioutil.WriteFile(filepath.Join(dir, fmt.Sprintf("tag%v", oldestI)), []byte(mgr.cfg.Tag), 0660)
}
if len(crash.text) > 0 {
symbolized, err := report.Symbolize(mgr.cfg.Vmlinux, crash.text)
if err != nil {
Logf(0, "failed to symbolize crash: %v", err)
} else {
crash.text = symbolized
}
ioutil.WriteFile(filepath.Join(dir, fmt.Sprintf("report%v", oldestI)), []byte(crash.text), 0660)
}
}
func main() {
flag.Parse()
if len(flag.Args()) != 1 {
fmt.Fprintf(os.Stderr, "usage: syz-symbolize [flags] kernel_log_file\n")
flag.PrintDefaults()
os.Exit(1)
}
text, err := ioutil.ReadFile(flag.Args()[0])
if err != nil {
fmt.Fprintf(os.Stderr, "failed to open input file: %v\n", err)
os.Exit(1)
}
if _, parsed, _, _ := report.Parse(text, nil); len(parsed) != 0 {
text = parsed
}
text, err = report.Symbolize(filepath.Join(*flagLinux, "vmlinux"), text)
if err != nil {
fmt.Fprintf(os.Stderr, "failed to symbolize: %v\n", err)
os.Exit(1)
}
os.Stdout.Write(text)
}
func main() {
if len(os.Args) != 3 {
fmt.Fprintf(os.Stderr, "usage: syz-report vmlinux report (args %+v)\n", os.Args)
os.Exit(1)
}
output, err := ioutil.ReadFile(os.Args[2])
if err != nil {
fmt.Fprintf(os.Stderr, "failed to read report file: %v\n", err)
os.Exit(1)
}
desc, text, _, _ := report.Parse(output)
if desc == "" {
fmt.Fprintf(os.Stderr, "report file does not contain a crash\n")
os.Exit(1)
}
symbolized, err := report.Symbolize(os.Args[1], text)
if err != nil {
fmt.Fprintf(os.Stderr, "failed to symbolize report: %v\n", err)
} else {
text = symbolized
}
fmt.Printf("%v\n\n%s", desc, text)
}