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mgrigorov pushed a commit to branch 9.0.x
in repository https://gitbox.apache.org/repos/asf/tomcat.git
The following commit(s) were added to refs/heads/9.0.x by this push:
new a84cdbf Wrap 'error' and 'applicationIOE' with AtomicReference
a84cdbf is described below
commit a84cdbfcdabefef4ed0030f430eecf7435a8ef58
Author: Martin Tzvetanov Grigorov <mgrigo...@apache.org>
AuthorDate: Thu Oct 1 13:29:42 2020 +0300
Wrap 'error' and 'applicationIOE' with AtomicReference
Under high load it is possible that one thread makes the check for non-null
and before the copy another thread to null-fy the member field.
SEVERE: Servlet.service() for servlet [plaintext] in context with path []
threw exception
java.lang.NullPointerException: Cannot throw exception because "ioe" is null
at
org.apache.coyote.http2.Http2UpgradeHandler.handleAppInitiatedIOException(Http2UpgradeHandler.java:797)
at
org.apache.coyote.http2.Http2AsyncUpgradeHandler.handleAsyncException(Http2AsyncUpgradeHandler.java:276)
at
org.apache.coyote.http2.Http2AsyncUpgradeHandler.writeWindowUpdate(Http2AsyncUpgradeHandler.java:252)
at
org.apache.coyote.http2.Stream$StreamInputBuffer.doRead(Stream.java:1088)
at org.apache.coyote.Request.doRead(Request.java:555)
at
org.apache.catalina.connector.InputBuffer.realReadBytes(InputBuffer.java:336)
at
org.apache.catalina.connector.InputBuffer.checkByteBufferEof(InputBuffer.java:632)
at org.apache.catalina.connector.InputBuffer.read(InputBuffer.java:362)
at
org.apache.catalina.connector.CoyoteInputStream.read(CoyoteInputStream.java:132)
at org.apache.catalina.connector.Request.readPostBody(Request.java:3308)
at
org.apache.catalina.connector.Request.parseParameters(Request.java:3241)
at org.apache.catalina.connector.Request.getParameter(Request.java:1124)
at
org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:381)
at
info.mgsolutions.tomcat.PlainTextServlet.doPost(PlainTextServlet.java:41)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:652)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
...
(cherry picked from commit 71b70117042bf646183e9e0395625dc1dcbf1333)
---
.../coyote/http2/Http2AsyncUpgradeHandler.java | 36 ++++++++++++----------
1 file changed, 19 insertions(+), 17 deletions(-)
diff --git a/java/org/apache/coyote/http2/Http2AsyncUpgradeHandler.java
b/java/org/apache/coyote/http2/Http2AsyncUpgradeHandler.java
index eb116a7..2068044 100644
--- a/java/org/apache/coyote/http2/Http2AsyncUpgradeHandler.java
+++ b/java/org/apache/coyote/http2/Http2AsyncUpgradeHandler.java
@@ -25,6 +25,7 @@ import java.nio.file.StandardOpenOption;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReference;
import javax.servlet.http.WebConnection;
@@ -43,8 +44,8 @@ public class Http2AsyncUpgradeHandler extends
Http2UpgradeHandler {
// Because of the compression used, headers need to be written to the
// network in the same order they are generated.
private final Object headerWriteLock = new Object();
- private Throwable error = null;
- private IOException applicationIOE = null;
+ private final AtomicReference<Throwable> error = new AtomicReference<>();
+ private final AtomicReference<IOException> applicationIOE = new
AtomicReference<>();
public Http2AsyncUpgradeHandler(Http2Protocol protocol, Adapter adapter,
Request coyoteRequest) {
@@ -57,7 +58,7 @@ public class Http2AsyncUpgradeHandler extends
Http2UpgradeHandler {
}
@Override
public void failed(Throwable t, Void attachment) {
- error = t;
+ error.set(t);
}
};
private final CompletionHandler<Long, Void> applicationErrorCompletion =
new CompletionHandler<Long, Void>() {
@@ -67,9 +68,9 @@ public class Http2AsyncUpgradeHandler extends
Http2UpgradeHandler {
@Override
public void failed(Throwable t, Void attachment) {
if (t instanceof IOException) {
- applicationIOE = (IOException) t;
+ applicationIOE.set((IOException) t);
}
- error = t;
+ error.set(t);
}
};
@@ -109,12 +110,13 @@ public class Http2AsyncUpgradeHandler extends
Http2UpgradeHandler {
TimeUnit.MILLISECONDS, null, SocketWrapperBase.COMPLETE_WRITE,
errorCompletion,
ByteBuffer.wrap(localSettings.getSettingsFrameForPending()),
ByteBuffer.wrap(createWindowUpdateForSettings()));
- if (error != null) {
+ Throwable err = error.get();
+ if (err != null) {
String msg = sm.getString("upgradeHandler.sendPrefaceFail",
connectionId);
if (log.isDebugEnabled()) {
log.debug(msg);
}
- throw new ProtocolException(msg, error);
+ throw new ProtocolException(msg, err);
}
}
@@ -270,17 +272,17 @@ public class Http2AsyncUpgradeHandler extends
Http2UpgradeHandler {
private void handleAsyncException() throws IOException {
- if (applicationIOE != null) {
- IOException ioe = applicationIOE;
- applicationIOE = null;
+ IOException ioe = applicationIOE.getAndSet(null);
+ if (ioe != null) {
handleAppInitiatedIOException(ioe);
- } else if (error != null) {
- Throwable error = this.error;
- this.error = null;
- if (error instanceof IOException) {
- throw (IOException) error;
- } else {
- throw new IOException(error);
+ } else {
+ Throwable err = this.error.getAndSet(null);
+ if (err != null) {
+ if (err instanceof IOException) {
+ throw (IOException) err;
+ } else {
+ throw new IOException(err);
+ }
}
}
}
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