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Fix retry race condition that can lead to double decrementing inFlightSubStreams and so miss calling closed #11026

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merged 3 commits into from
Mar 22, 2024
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Fix retry race condition that can lead to double decrementing inFlightSubStreams and so miss calling closed #11026

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736edcb
Fix retry race condition that can lead to double decrementing inFligh…
larry-safran Mar 21, 2024
ba5e4e0
Handle case where the race condition with cancel causes the decrement…
larry-safran Mar 21, 2024
6000630
Update comment about using parent instead of child locks to be on the…
larry-safran Mar 21, 2024
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26 changes: 20 additions & 6 deletions core/src/main/java/io/grpc/internal/RetriableStream.java
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Original file line number Diff line number Diff line change
Expand Up @@ -153,7 +153,6 @@
@Nullable // null if already committed
@CheckReturnValue
private Runnable commit(final Substream winningSubstream) {

synchronized (lock) {
if (state.winningSubstream != null) {
return null;
Expand All @@ -165,10 +164,9 @@
// subtract the share of this RPC from channelBufferUsed.
channelBufferUsed.addAndGet(-perRpcBufferUsed);

final boolean wasCancelled = (scheduledRetry != null) ? scheduledRetry.isCancelled() : false;
final Future<?> retryFuture;
if (scheduledRetry != null) {
// TODO(b/145386688): This access should be guarded by 'this.scheduledRetry.lock'; instead
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Why remove these? These look disabled by the @SuppressWarnings("GuardedBy")

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The way that the comments were done was intrusive and ugly. Changed them all to be on the SuppressWarnings annotation.

// found: 'this.lock'
retryFuture = scheduledRetry.markCancelled();
scheduledRetry = null;
} else {
Expand All @@ -177,8 +175,6 @@
// cancel the scheduled hedging if it is scheduled prior to the commitment
final Future<?> hedgingFuture;
if (scheduledHedging != null) {
// TODO(b/145386688): This access should be guarded by 'this.scheduledHedging.lock'; instead
// found: 'this.lock'
hedgingFuture = scheduledHedging.markCancelled();
scheduledHedging = null;
} else {
Expand All @@ -196,6 +192,9 @@
}
if (retryFuture != null) {
retryFuture.cancel(false);
if (!wasCancelled) {
inFlightSubStreams.decrementAndGet();
}
}
if (hedgingFuture != null) {
hedgingFuture.cancel(false);
Expand Down Expand Up @@ -999,9 +998,19 @@
synchronized (lock) {
scheduledRetry = scheduledRetryCopy = new FutureCanceller(lock);
}

class RetryBackoffRunnable implements Runnable {
@Override
@SuppressWarnings("FutureReturnValueIgnored")
public void run() {
synchronized (scheduledRetryCopy.lock) {
if (scheduledRetryCopy.isCancelled()) {
return;

Check warning on line 1008 in core/src/main/java/io/grpc/internal/RetriableStream.java

View check run for this annotation

Codecov / codecov/patch

core/src/main/java/io/grpc/internal/RetriableStream.java#L1008 

Added line #L1008 was not covered by tests
} else {
scheduledRetryCopy.markCancelled();
}
}

callExecutor.execute(
new Runnable() {
@Override
Expand Down Expand Up @@ -1563,11 +1572,16 @@
}

void setFuture(Future<?> future) {
boolean wasCancelled;
synchronized (lock) {
if (!cancelled) {
wasCancelled = cancelled;
if (!wasCancelled) {
this.future = future;
}
}
if (wasCancelled) {
future.cancel(false);

Check warning on line 1583 in core/src/main/java/io/grpc/internal/RetriableStream.java

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core/src/main/java/io/grpc/internal/RetriableStream.java#L1583 

Added line #L1583 was not covered by tests
}
}

@GuardedBy("lock")
Expand Down
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