Program: 110660
Project: 110660
Buggy source:
@Nullable private static ImmutableBiMap<Label,Label> resolveToolchainLabels(Environment env,Set<Label> requiredToolchains,BuildConfiguration configuration) throws InterruptedException, ToolchainContextException {
  if (requiredToolchains.isEmpty()) {
    return ImmutableBiMap.of();
  }
  PlatformDescriptors platforms=loadPlatformDescriptors(env,configuration);
  if (platforms == null) {
    return null;
  }
  List<SkyKey> registeredToolchainKeys=new ArrayList<>();
  for (  Label toolchainType : requiredToolchains) {
    registeredToolchainKeys.add(ToolchainResolutionValue.key(configuration,toolchainType,platforms.targetPlatform(),platforms.execPlatform()));
  }
  Map<SkyKey,ValueOrException4<NoToolchainFoundException,ConfiguredValueCreationException,InvalidToolchainLabelException,EvalException>> results=env.getValuesOrThrow(registeredToolchainKeys,NoToolchainFoundException.class,ConfiguredValueCreationException.class,InvalidToolchainLabelException.class,EvalException.class);
  boolean valuesMissing=false;
  ImmutableBiMap.Builder<Label,Label> builder=new ImmutableBiMap.Builder<>();
  List<Label> missingToolchains=new ArrayList<>();
  for (  Map.Entry<SkyKey,ValueOrException4<NoToolchainFoundException,ConfiguredValueCreationException,InvalidToolchainLabelException,EvalException>> entry : results.entrySet()) {
    try {
      Label requiredToolchainType=((ToolchainResolutionKey)entry.getKey().argument()).toolchainType();
      ValueOrException4<NoToolchainFoundException,ConfiguredValueCreationException,InvalidToolchainLabelException,EvalException> valueOrException=entry.getValue();
      if (valueOrException.get() == null) {
        valuesMissing=true;
      }
 else {
        Label toolchainLabel=((ToolchainResolutionValue)valueOrException.get()).toolchainLabel();
        builder.put(requiredToolchainType,toolchainLabel);
      }
    }
 catch (    NoToolchainFoundException e) {
      missingToolchains.add(e.missingToolchainType());
    }
catch (    ConfiguredValueCreationException e) {
      throw new ToolchainContextException(e);
    }
catch (    InvalidToolchainLabelException e) {
      throw new ToolchainContextException(e);
    }
catch (    EvalException e) {
      throw new ToolchainContextException(e);
    }
  }
  if (valuesMissing) {
    return null;
  }
  if (!missingToolchains.isEmpty()) {
    throw new ToolchainContextException(new UnresolvedToolchainsException(missingToolchains));
  }
  return builder.build();
}

Fixed version (ground truth):
@Nullable private static ImmutableBiMap<Label,Label> resolveToolchainLabels(Environment env,Set<Label> requiredToolchains,BuildConfiguration configuration) throws InterruptedException, ToolchainContextException {
  if (requiredToolchains.isEmpty()) {
    return ImmutableBiMap.of();
  }
  PlatformDescriptors platforms=loadPlatformDescriptors(env,configuration);
  if (platforms == null) {
    return null;
  }
  List<SkyKey> registeredToolchainKeys=new ArrayList<>();
  for (  Label toolchainType : requiredToolchains) {
    registeredToolchainKeys.add(ToolchainResolutionValue.key(configuration,toolchainType,platforms.targetPlatform(),platforms.execPlatform()));
  }
  Map<SkyKey,ValueOrException4<NoToolchainFoundException,ConfiguredValueCreationException,InvalidToolchainLabelException,EvalException>> results=env.getValuesOrThrow(registeredToolchainKeys,NoToolchainFoundException.class,ConfiguredValueCreationException.class,InvalidToolchainLabelException.class,EvalException.class);
  boolean valuesMissing=false;
  ImmutableBiMap.Builder<Label,Label> builder=new ImmutableBiMap.Builder<>();
  List<Label> missingToolchains=new ArrayList<>();
  for (  Map.Entry<SkyKey,ValueOrException4<NoToolchainFoundException,ConfiguredValueCreationException,InvalidToolchainLabelException,EvalException>> entry : results.entrySet()) {
    try {
      Label requiredToolchainType=((ToolchainResolutionKey)entry.getKey().argument()).toolchainType();
      ValueOrException4<NoToolchainFoundException,ConfiguredValueCreationException,InvalidToolchainLabelException,EvalException> valueOrException=entry.getValue();
      if (valueOrException.get() == null) {
        valuesMissing=true;
      }
 else {
        Label toolchainLabel=((ToolchainResolutionValue)valueOrException.get()).toolchainLabel();
        builder.put(requiredToolchainType,toolchainLabel);
      }
    }
 catch (    NoToolchainFoundException e) {
      missingToolchains.add(e.missingToolchainType());
    }
catch (    ConfiguredValueCreationException e) {
      throw new ToolchainContextException(e);
    }
catch (    InvalidToolchainLabelException e) {
      throw new ToolchainContextException(e);
    }
catch (    EvalException e) {
      throw new ToolchainContextException(e);
    }
  }
  if (!missingToolchains.isEmpty()) {
    throw new ToolchainContextException(new UnresolvedToolchainsException(missingToolchains));
  }
  if (valuesMissing) {
    return null;
  }
  return builder.build();
}