Program: 41111
Project: 41111
Buggy source:
public int compareTo(Configuration that){
  int n;
  float a=this.fontScale;
  float b=that.fontScale;
  if (a < b)   return -1;
  if (a > b)   return 1;
  n=this.mcc - that.mcc;
  if (n != 0)   return n;
  n=this.mnc - that.mnc;
  if (n != 0)   return n;
  if (this.locale == null) {
    if (that.locale != null)     return 1;
  }
 else   if (that.locale == null) {
    return -1;
  }
 else {
    n=this.locale.getLanguage().compareTo(that.locale.getLanguage());
    if (n != 0)     return n;
    n=this.locale.getCountry().compareTo(that.locale.getCountry());
    if (n != 0)     return n;
    n=this.locale.getVariant().compareTo(that.locale.getVariant());
    if (n != 0)     return n;
  }
  n=this.touchscreen - that.touchscreen;
  if (n != 0)   return n;
  n=this.keyboard - that.keyboard;
  if (n != 0)   return n;
  n=this.keyboardHidden - that.keyboardHidden;
  if (n != 0)   return n;
  n=this.hardKeyboardHidden - that.hardKeyboardHidden;
  if (n != 0)   return n;
  n=this.navigation - that.navigation;
  if (n != 0)   return n;
  n=this.navigationHidden - that.navigationHidden;
  if (n != 0)   return n;
  n=this.orientation - that.orientation;
  if (n != 0)   return n;
  n=this.screenLayout - that.screenLayout;
  if (n != 0)   return n;
  n=this.uiMode - that.uiMode;
  n=this.customTheme.getThemeId().compareTo(that.customTheme.getThemeId());
  if (n != 0)   return n;
  n=this.customTheme.getThemePackageName().compareTo(that.customTheme.getThemePackageName());
  return n;
}

Fixed version (ground truth):
public int compareTo(Configuration that){
  int n;
  float a=this.fontScale;
  float b=that.fontScale;
  if (a < b)   return -1;
  if (a > b)   return 1;
  n=this.mcc - that.mcc;
  if (n != 0)   return n;
  n=this.mnc - that.mnc;
  if (n != 0)   return n;
  if (this.locale == null) {
    if (that.locale != null)     return 1;
  }
 else   if (that.locale == null) {
    return -1;
  }
 else {
    n=this.locale.getLanguage().compareTo(that.locale.getLanguage());
    if (n != 0)     return n;
    n=this.locale.getCountry().compareTo(that.locale.getCountry());
    if (n != 0)     return n;
    n=this.locale.getVariant().compareTo(that.locale.getVariant());
    if (n != 0)     return n;
  }
  n=this.touchscreen - that.touchscreen;
  if (n != 0)   return n;
  n=this.keyboard - that.keyboard;
  if (n != 0)   return n;
  n=this.keyboardHidden - that.keyboardHidden;
  if (n != 0)   return n;
  n=this.hardKeyboardHidden - that.hardKeyboardHidden;
  if (n != 0)   return n;
  n=this.navigation - that.navigation;
  if (n != 0)   return n;
  n=this.navigationHidden - that.navigationHidden;
  if (n != 0)   return n;
  n=this.orientation - that.orientation;
  if (n != 0)   return n;
  n=this.screenLayout - that.screenLayout;
  if (n != 0)   return n;
  n=this.uiMode - that.uiMode;
  if (n != 0)   return n;
  if (this.customTheme == null) {
    if (that.customTheme != null)     return 1;
  }
 else   if (that.customTheme == null) {
    return -1;
  }
 else {
    n=this.customTheme.getThemeId().compareTo(that.customTheme.getThemeId());
    if (n != 0)     return n;
    n=this.customTheme.getThemePackageName().compareTo(that.customTheme.getThemePackageName());
    if (n != 0)     return n;
  }
  return n;
}