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Fix potential race during TcpTransport close (#39031) 

Fixed two potential causes for leaked threads during tests:
1. When adding a channel to serverChannels, we add it under a monitor
that we do not use when reading from it. This is potentially unsafe if
there is no other happens-before relationship ensuring the safety of
this.
2. Long-shot but if the thread pool was shutdown before entering this
code, we would silently forget about closing server channels so added
assert.

Strengthened the locking to ensure that once we stop the transport, no
new server channels can be made.

Relates to CI failure issue: #37543
This commit is contained in:
Henning Andersen 2019-02-18 18:10:00 +01:00 committed by Henning Andersen
parent ae9243ad0a
commit 99b2bc3461
1 changed files with 21 additions and 20 deletions
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19
server/src/main/java/org/elasticsearch/transport/TcpTransport.java
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@ -388,18 +388,16 @@ public abstract class TcpTransport extends AbstractLifecycleComponent implements
PortsRange portsRange = new PortsRange(port);
final AtomicReference<Exception> lastException = new AtomicReference<>();
final AtomicReference<InetSocketAddress> boundSocket = new AtomicReference<>();
closeLock.writeLock().lock();
try {
if (lifecycle.initialized() == false && lifecycle.started() == false) {
throw new IllegalStateException("transport has been stopped");
}
boolean success = portsRange.iterate(portNumber -> {
try {
TcpServerChannel channel = bind(name, new InetSocketAddress(hostAddress, portNumber));
synchronized (serverChannels) {
List<TcpServerChannel> list = serverChannels.get(name);
if (list == null) {
list = new ArrayList<>();
serverChannels.put(name, list);
}
list.add(channel);
serverChannels.computeIfAbsent(name, k -> new ArrayList<>()).add(channel);
boundSocket.set(channel.getLocalAddress());
}
} catch (Exception e) {
lastException.set(e);
return false;
@ -409,7 +407,9 @@ public abstract class TcpTransport extends AbstractLifecycleComponent implements
if (!success) {
throw new BindTransportException("Failed to bind to [" + port + "]", lastException.get());
}
} finally {
closeLock.writeLock().unlock();
}
if (logger.isDebugEnabled()) {
logger.debug("Bound profile [{}] to address {{}}", name, NetworkAddress.format(boundSocket.get()));
}
@ -553,6 +553,7 @@ public abstract class TcpTransport extends AbstractLifecycleComponent implements
protected final void doStop() {
final CountDownLatch latch = new CountDownLatch(1);
// make sure we run it on another thread than a possible IO handler thread
assert threadPool.generic().isShutdown() == false : "Must stop transport before terminating underlying threadpool";
threadPool.generic().execute(() -> {
closeLock.writeLock().lock();
try {