https://bz.apache.org/bugzilla/show_bug.cgi?id=65118
Bug ID: 65118
Summary: Spurious null pointer exception in Http2UpgradeHandler
when reloading web page
Product: Tomcat 9
Version: 9.0.41
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: mattias.holmkv...@netinsight.net
Target Milestone: -----
We have a web application using Tomcat configured to use HTTP/2
Sometimes (about 1 out of 10) when reloading a web page one or more resources
fails to load, typically style.css, with error connection reset reported by web
browser.
In the catalina log file the following it logged:
>27-Jan-2021 16:59:02.435 FINE [https-openssl-apr-0.0.0.0-8443-exec-2]
>org.apache.coyote.http2.Http2UpgradeHandler.upgradeDispatch Entry, Connection
>[2], SocketStatus [OPEN_READ]
>27-Jan-2021 16:59:02.435 FINE [https-openssl-apr-0.0.0.0-8443-exec-2]
>org.apache.coyote.http2.Http2UpgradeHandler.init Connection [2], State
>[CONNECTED]
>27-Jan-2021 16:59:02.436 FINE [https-openssl-apr-0.0.0.0-8443-exec-2]
>org.apache.coyote.http2.Http2Parser.validateFrame Connection [2], Stream
>[1019], Frame type [HEADERS], Flags [37], Payload size [44]
>27-Jan-2021 16:59:02.436 FINE [https-openssl-apr-0.0.0.0-8443-exec-2]
>org.apache.coyote.http2.Http2UpgradeHandler.pruneClosedStreams Connection [2]
>Starting pruning of old streams. Limit is [100] + 10% and there are currently
>[509] streams.
>27-Jan-2021 16:59:02.436 FINE [https-openssl-apr-0.0.0.0-8443-exec-2]
>org.apache.coyote.http2.Http2UpgradeHandler.pruneClosedStreams Connection [2]
>Pruned completed stream [1]
>27-Jan-2021 17:00:23.798 FINE [https-openssl-apr-0.0.0.0-8443-exec-2]
>org.apache.coyote.http2.Http2UpgradeHandler.pruneClosedStreams Connection [2]
>Pruned completed stream [3]
>27-Jan-2021 17:00:57.370 FINE [https-openssl-apr-0.0.0.0-8443-exec-2]
>org.apache.coyote.http2.Http2UpgradeHandler.pruneClosedStreams Connection [2]
>Pruned completed stream [1]
>27-Jan-2021 17:01:18.505 SEVERE [https-openssl-apr-0.0.0.0-8443-exec-2]
>org.apache.coyote.AbstractProtocol$ConnectionHandler.process Error reading
>request, ignored
> java.lang.NullPointerException
> at
> org.apache.coyote.http2.Http2UpgradeHandler.pruneClosedStreams(Http2UpgradeHandler.java:1249)
> at
> org.apache.coyote.http2.Http2UpgradeHandler.createRemoteStream(Http2UpgradeHandler.java:1129)
> at
> org.apache.coyote.http2.Http2UpgradeHandler.headersStart(Http2UpgradeHandler.java:1508)
> at
> org.apache.coyote.http2.Http2Parser.readHeadersFrame(Http2Parser.java:225)
> at
> org.apache.coyote.http2.Http2Parser.readFrame(Http2Parser.java:99)
> at
> org.apache.coyote.http2.Http2Parser.readFrame(Http2Parser.java:71)
> at
> org.apache.coyote.http2.Http2UpgradeHandler.upgradeDispatch(Http2UpgradeHandler.java:339)
> at
> org.apache.coyote.http11.upgrade.UpgradeProcessorInternal.dispatch(UpgradeProcessorInternal.java:60)
> at
> org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:59)
> at
> org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:888)
> at
> org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:1991)
> at
> org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at
> org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
> at java.lang.Thread.run(Thread.java:748)
We see this with multiple web browsers including Chrome (88.0.4324.104) and
Firefox (84.0.2)
Tomcat is configured to use HTTP/2 with default values.
In order to reproduce this issue we continuously reload a web page until issue
occurs.
After examining the logs and the code (Http2UpgradeHandler.java:1249) it seems
to me that the same stream is pruned twice, in the same go, and the second time
its parent is already removed resulting in a NPE due to variable parent is
null.
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