8323670: A few client tests intermittently throw ConcurrentModificationException #17462

TejeshR13 · 2024-01-17T12:55:52Z

Suggested fix JDK-8307091 also created concurrent exception intermittently (monthly once/quarterly once) on CI system. The issue was not able to be reproduced yet, hence proposing an alternative fix which uses iterators to compare the List.
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Issue

JDK-8323670: A few client tests intermittently throw ConcurrentModificationException (Bug - P4)

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Alexey Ivanov (@aivanov-jdk - Reviewer)
Sergey Bylokhov (@mrserb - Reviewer)

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bridgekeeper · 2024-01-17T12:57:37Z

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openjdk · 2024-01-17T12:58:10Z

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mlbridge · 2024-01-17T13:08:27Z

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mrserb · 2024-01-19T00:13:10Z

What is the code path which modifies the vector when we iterate it?

TejeshR13 · 2024-01-19T07:24:14Z

What is the code path which modifies the vector when we iterate it?

I don't think we are able to trace it out, since the issue intermittent and previously I had made a copy of the vector list before checking for equality of the list. There was again an issue in the code which I used to copy to a temporary vector. So now instead of using AbstractList.equals I'm using iterators and comparing every element within synchronized method.

turbanoff · 2024-01-20T15:05:09Z

src/java.desktop/share/classes/javax/swing/plaf/basic/BasicDirectoryModel.java

@@ -412,6 +413,18 @@ private void cancelRunnables() {
                runnable.cancel();
            }
        }
+
+        private synchronized <T> boolean compareIterators(Iterator<T> iterator1, Iterator<T> iterator2) {


I'm not sure I understand, how this synchronized helps to avoid the issue.

Since concurrent modification exception is thrown, it is clear that the List is being modified while comparing two list. Hence instead of copying the list locally, I have used iterators and comparing element by element in a synchronized method which ensures single thread is accessing the iterators. Without synchronized I guess it would again cause concurrentModificationException.

Vector.iterator and Vector.subList.iterator are still check for modification on iteration (see usages of the method java.util.AbstractList.SubList#checkForComodification). It means, if vector was concurrently modified during iteration - iteration will fail with the ConcurrentModificationException

Yes, which is why I am using Synchronized to handle concurrentModificationException.

It doesn't work like this. Modification happen in another thread in another method. This synchronized doesn't affect another method.

Using synchronized (fileCache) inside ShellFolder.invoke would be better and one solution right? Than making local copy and again doing sanity checks/changing to ArrayList?

Using synchronized (fileCache) inside ShellFolder.invoke would be better and one solution right? Than making local copy and again doing sanity checks/changing to ArrayList?

I'm afraid I can't answer this question without more details on what is achieved by this code. We need to look closely into what was done for JDK-8240690: Race condition between EDT and BasicDirectoryModel.FilesLoader.run0().

Putting the entire method into synchronized (fileCache) is an easy solution. Yet any other thread which accesses fileCache will be blocked until the code exits the synchronized block in the call method. This somewhat defeats updating the file list in the background, doesn't it?

Even if you'll go this route, I'm for replacing Vector with ArrayList for the newFileCache and newFiles variables. These are local variables, they're not accessed concurrently. Yet they're accessed from two threads: the current one and the one where ShellFolder.invoke runs, so there could be a need to use another synchronisation technique to ensure thread-safety between these two threads.

Even if you'll go this route, I'm for replacing Vector with ArrayList for the newFileCache and newFiles variables. These are local variables, they're not accessed concurrently. Yet they're accessed from two threads: the current one and the one where ShellFolder.invoke runs, so there could be a need to use another synchronisation technique to ensure thread-safety between these two threads.

Another Synchronization technique even after synchronized (fileCache)?

Even if you'll go this route, I'm for replacing Vector with ArrayList for the newFileCache and newFiles variables. These are local variables, they're not accessed concurrently. Yet they're accessed from two threads: the current one and the one where ShellFolder.invoke runs, so there could be a need to use another synchronisation technique to ensure thread-safety between these two threads.

Another Synchronization technique even after synchronized (fileCache)?

Yes, even after.

…I'm for replacing Vector with ArrayList for the newFileCache and newFiles variables. These are local variables, they're not accessed concurrently. Yet they're accessed from two threads: the current one and the one where ShellFolder.invoke runs, so there could be a need to use another synchronisation technique to ensure thread-safety between these two threads.

Another Synchronization technique even after synchronized (fileCache)?

Yes, even after.

No, it's not needed, actually. ShellFolder.invoke executes the code directly on the same thread or passes it to COM thread on Windows. When it's passed to the COM thread, a Future object is used, which ensures synchronisation.

I submitted JDK-8324973: Replace Vector with ArrayList in BasicDirectoryModel.FilesLoader.

aivanov-jdk · 2024-01-24T19:26:15Z

In JDK-8307091, ConcurrentModificationException is thrown from equals, likely from this line:

jdk/src/java.desktop/share/classes/javax/swing/plaf/basic/BasicDirectoryModel.java

Line 364 in 2a799e5

    
           && newFileCache.subList(end, newSize).equals(fileCache.subList(start, oldSize))) {

Here, fileCache is passed as a parameter, it can be modified while newFileCache.subList().equals() runs. You could've put this into synchronized(fileCache) to solve the problem.

In JDK-8323670, the exception is thrown from Vector constructor:

jdk/src/java.desktop/share/classes/javax/swing/plaf/basic/BasicDirectoryModel.java

Line 365 in c702dca

List<File> listStart_OldSize = new Vector<>(fileCache.subList(start, oldSize));

Here, we have exactly the same problem: fileCache, well fileCache.subList to be exact, is iterated without locking. (The subList uses the same object as the lock object, which is fileCache.) If you move this line into synchronized(fileCache), the problem would resolved.

However, as I pointed out above, the code in the call method may still fail. There are at least two bugs where ConcurrentModificationException is thrown, which means fileCache can be modified. The for-loops access elements in fileCache using the variable oldSize as the size of the collection. Since the size can grow or shrink, it is possible that the code requests an element which is not in the fileCache any more.

Yes, putting everything into synchronized(fileCache) will resolve this problem too. Is it the best solution?

TejeshR13 · 2024-01-25T04:43:59Z

Instead of putting everything into synchronized(fileCache), I guess the better solution would be to wrap this line

jdk/src/java.desktop/share/classes/javax/swing/plaf/basic/BasicDirectoryModel.java

Line 365 in c702dca

List<File> listStart_OldSize = new Vector<>(fileCache.subList(start, oldSize));

into synchronized(fileCache). With this we can ensure that a local copy would be made before comparing two fileCache list, since we cannot/shouldn't depend on any addition/deletion from fileCache.

…_8323670

aivanov-jdk · 2024-01-25T10:50:32Z

Instead of putting everything into synchronized(fileCache), I guess the better solution would be to wrap this line

jdk/src/java.desktop/share/classes/javax/swing/plaf/basic/BasicDirectoryModel.java

Line 365 in c702dca

List<File> listStart_OldSize = new Vector<>(fileCache.subList(start, oldSize));

into synchronized(fileCache). With this we can ensure that a local copy would be made before comparing two fileCache list, since we cannot/shouldn't depend on any addition/deletion from fileCache.

But this won't resolve the problem completely.

A better solution could still be creating a local copy of fileCache and then use it to calculating the diffs.

There's still a problem: if fileCache is mutated again, the diffs become outdated. It's not taken into account by the current code. We can still ignore it.

Then I haven't figured it out for what the calculated diffs are used. I also see that the evaluation can be cancelled.

In fact, I see more thread-safety issues in the implementation… There are some fields and variables which are accessed without proper synchronisation.

I looked at the code once again after reading @mrserb's code review for JDK-8240690, it seems that it goes like this:

The loader thread is created. Its run0 method populates the files from file system. (It does so using fileSystem.getFiles which may be not thread-safe as well.)
The list of files is filtered (which also uses possibly non-thread-safe methods from JFileChooser).
The list of files is sorted.
The code inside ShellFolder.invoke is run on yet another thread. It calculates the diffs between the current fileCache and newFileCache created up to step 3.
The result of step 4 is an object of DoChangeContents which contains a snapshot of added or removed files. The object implements Runnable interface and is assigned to the field runnable.
This runnable is posted to be executed on EDT via invokeLater. It updates fileCache.

~~Step 6 uses doFire variable, it could be set to false using the cancel method, which is synchronized. As such, reading the value of doFire must also be synchronised.~~

Looking at the methods of BasicDirectoryModel, I can see that some methods use synchronized(fileCache) before accessing the field but others (getSize, contains, indexOf, getElementAt), which makes the BasicDirectoryModel class not thread-safe; it is especially dangerous with contains and indexOf where the contents of the fileCache can be changed while the method is iterating over the values inside fileCache.

aivanov-jdk · 2024-01-25T10:56:33Z

Taking the above into account, I appears that the code inside ShellFolder.invoke.call should actually be inside synchronized (fileCache). It would resolve ConcurrentModificationException.

And you should revert the changes you made in JDK-8323670. This bug is the proof that fix didn't help.

Ideally, we should have a test which reproduces the problem… Yet, as with all concurrency issues, writing such a test could be very hard.

TejeshR13 · 2024-01-25T11:10:05Z

Taking the above into account, I appears that the code inside ShellFolder.invoke.call should actually be inside synchronized (fileCache). It would resolve ConcurrentModificationException.

And you should revert the changes you made in JDK-8323670. This bug is the proof that fix didn't help.

Ideally, we should have a test which reproduces the problem… Yet, as with all concurrency issues, writing such a test could be very hard.

Yeah, sure then I'll revert the changes and update the changes.

aivanov-jdk · 2024-01-25T12:08:13Z

Looking at the methods of BasicDirectoryModel, I can see that some methods use synchronized(fileCache) before accessing the field but others (getSize, contains, indexOf, getElementAt), which makes the BasicDirectoryModel class not thread-safe; it is especially dangerous with contains and indexOf where the contents of the fileCache can be changed while the method is iterating over the values inside fileCache.

~~I've just submitted JDK-8324719: Missing synchronized block in BasicDirectoryModel to address this synchronisation issue.~~

It was my mistake: Vector is a synchronised collection, therefore its methods are synchronised. Other methods need an explicit synchronised block because they manipulate the data in fileCache before returning the result.

aivanov-jdk · 2024-01-25T12:11:04Z

Step 6 uses doFire variable, it could be set to false using the cancel method, which is synchronized. As such, reading the value of doFire must also be synchronised.

It's not a problem, the run method is synchronized.

There's a bug against it: JDK-8238169: BasicDirectoryModel getDirectories and DoChangeContents.run can deadlock.

Does run need to be synchronised? Probably not, only reading the value of doFire needs to be.

mrserb · 2024-01-26T22:57:49Z

I don't think we are able to trace it out, since the issue intermittent and previously I had made a copy of the vector list before checking for equality of the list. There was again an issue in the code which I used to copy to a temporary vector. So now instead of using AbstractList.equals I'm using iterators and comparing every element within synchronized method.

I think we should start investigating this one, probably by adding special delays/asserts into the JDK to track down on what threads the data is modified and used.

aivanov-jdk · 2024-01-26T23:18:58Z

I don't think we are able to trace it out, since the issue intermittent and previously I had made a copy of the vector list before checking for equality of the list. There was again an issue in the code which I used to copy to a temporary vector. So now instead of using AbstractList.equals I'm using iterators and comparing every element within synchronized method.

I think we should start investigating this one, probably by adding special delays/asserts into the JDK to track down on what threads the data is modified and used.

According to my analysis above, there there are two threads. (The third thread is also possible if validateFileCache is called not on EDT.) The only thread that modifies fileCache is EDT with DoChangeContents. Then the ShellFolder thread reads from fileCache without synchronisation, which allows the contents of fileCache to be modified concurrently.

aivanov-jdk · 2024-01-29T14:24:47Z

I don't think we are able to trace it out, since the issue intermittent and previously I had made a copy of the vector list before checking for equality of the list. There was again an issue in the code which I used to copy to a temporary vector. So now instead of using AbstractList.equals I'm using iterators and comparing every element within synchronized method.

I think we should start investigating this one, probably by adding special delays/asserts into the JDK to track down on what threads the data is modified and used.

According to my analysis above, there there are two threads. (The third thread is also possible if validateFileCache is called not on EDT.) The only thread that modifies fileCache is EDT with DoChangeContents. Then the ShellFolder thread reads from fileCache without synchronisation, which allows the contents of fileCache to be modified concurrently.

Upon further testing, I found out that ShellFolder.invoke runs in the calling thread on Linux and macOS, on Windows it runs on the COM thread where Windows Shell is accessed.

In addition to this, there's AquaFileSystemModel. This class is used in Aqua Look-and-Feel on macOS.

According to this comment

jdk/src/java.desktop/macosx/classes/com/apple/laf/AquaFileSystemModel.java

Line 41 in fe0eec7

* Some of it came from BasicDirectoryModel

the class contains portions of code copied from BasicDirectoryModel and therefore could have a similar synchronisation issue.

aivanov-jdk · 2024-01-29T14:47:06Z

@mrserb I've been trying to write a regression test for this problem. Have I succeeded? Not quite… I am unable to get ConcurrentModificationException on any platform when I run the test locally. However, the test fails in the Oracle CI on macOS and Linux, both x86_64 and aarch64, especially when run with JTREG=REPEAT_COUNT=50. On Windows, it fails with OutOfMemoryError.

In the CI on macOS, the test runs in headless mode, in this case BasicDirectoryModel is used instead of AquaFileSystemModel.

Thus, the test is not stable enough. Yet it still allows testing the fix. The test does not fail with ConcurrentModificationException when run on the build with the proposed fix in this PR.

Could you please run the test too?

git fetch https://github.com/aivanov-jdk/jdk.git 8323670-BasicDirectoryModel-concurrency:8323670-BasicDirectoryModel-concurrency
git checkout 8323670-BasicDirectoryModel-concurrency
java test/jdk/javax/swing/JFileChooser/FileSystemView/BasicDirectoryModelConcurrency.java

The commands above are similar to those provided in “Reviewing using Git” section in PRs on GitHub.

src/java.desktop/share/classes/javax/swing/plaf/basic/BasicDirectoryModel.java

…_8323670

aivanov-jdk

Looks good to me.

I cannot get ConcurrentModificationException when running my test, BasicDirectoryModelConcurrency.java, on a build with the fix.

openjdk · 2024-01-30T14:23:10Z

@TejeshR13 This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8323670: A few client tests intermittently throw ConcurrentModificationException

Reviewed-by: aivanov, serb

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 28 new commits pushed to the master branch:

68206b5: 8324585: JVM native memory leak in PCKS11-NSS security provider
1aba78f: 8324937: GHA: Avoid multiple test suites per job
a663248: 8324668: JDWP process management needs more efficient file descriptor handling
a2229b1: 8324838: test_nmt_locationprinting.cpp broken in the gcc windows build
432756b: 8325024: java/security/cert/CertPathValidator/OCSP/OCSPTimeout.java incorrect comment information
fe78c0f: 8325022: Incorrect error message on client authentication
5b9b176: 8324174: assert(m->is_entered(current)) failed: invariant
0cc8e5b: 8325042: remove unused JVMDITools test files
f292053: 8323621: JDK build should exclude snippet class in java.lang.foreign
62c9530: 8324238: [macOS] java/awt/Frame/ShapeNotSetSometimes/ShapeNotSetSometimes.java fails with the shape has not been applied msg
... and 18 more: https://git.openjdk.org/jdk/compare/fd8adf308357355bd33916ad80e2328c35434e5a...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

aivanov-jdk · 2024-01-30T16:30:43Z

I forgot to add a direct link to the test: BasicDirectoryModelConcurrency.java

@mrserb I've been trying to write a regression test for this problem. Have I succeeded? Not quite… I am unable to get ConcurrentModificationException on any platform when I run the test locally.

I reproduced the issue a few times on macOS and once on Linux, on a local host rather than in CI.

TejeshR13 · 2024-01-31T04:53:44Z

I forgot to add a direct link to the test: BasicDirectoryModelConcurrency.java

@mrserb I've been trying to write a regression test for this problem. Have I succeeded? Not quite… I am unable to get ConcurrentModificationException on any platform when I run the test locally.

I reproduced the issue a few times on macOS and once on Linux, on a local host rather than in CI.

Not able to reproduce in CI?

aivanov-jdk · 2024-01-31T11:19:08Z

I forgot to add a direct link to the test: BasicDirectoryModelConcurrency.java

@mrserb I've been trying to write a regression test for this problem. Have I succeeded? Not quite… I am unable to get ConcurrentModificationException on any platform when I run the test locally.

I reproduced the issue a few times on macOS and once on Linux, on a local host rather than in CI.

Not able to reproduce in CI?

The opposite. It fails in Oracle CI, yet it's still not stable enough.

And the test doesn't clean up the files when it fails. So it needs additional work.

TejeshR13 · 2024-02-01T14:03:53Z

/integrate

openjdk · 2024-02-01T14:05:07Z

Going to push as commit 70e7cdc.
Since your change was applied there have been 34 commits pushed to the master branch:

ac1cd31: 8325096: Test java/security/cert/CertPathBuilder/akiExt/AKISerialNumber.java is failing
8e45182: 8324834: Use _LARGE_FILES on AIX
cab74b0: 8324287: Record total and free swap space in JFR
6b84f9b: 8325001: Typo in the javadocs for the Arena::ofShared method
cd11059: 8325053: Serial: Move Generation::save_used_region to TenuredGeneration
d9331bf: 8324845: management.properties text "interface name" is misleading
68206b5: 8324585: JVM native memory leak in PCKS11-NSS security provider
1aba78f: 8324937: GHA: Avoid multiple test suites per job
a663248: 8324668: JDWP process management needs more efficient file descriptor handling
a2229b1: 8324838: test_nmt_locationprinting.cpp broken in the gcc windows build
... and 24 more: https://git.openjdk.org/jdk/compare/fd8adf308357355bd33916ad80e2328c35434e5a...master

Your commit was automatically rebased without conflicts.

openjdk · 2024-02-01T14:05:14Z

@TejeshR13 Pushed as commit 70e7cdc.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.

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openjdk bot added the client client-libs-dev@openjdk.org label Jan 17, 2024

TejeshR13 changed the title ~~Fix~~ 8323670: A few client tests intermittently throw ConcurrentModificationException Jan 17, 2024

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Merge branch 'master' of https://git.openjdk.java.net/jdk into branch…

dcec2ad

…_8323670

Revert fix 8307091 + Synchronised filecache

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TejeshR13 added 2 commits January 30, 2024 17:11

Merge branch 'master' of https://git.openjdk.java.net/jdk into branch…

ee4469e

…_8323670

Review updates - Indentatioins and unused imports

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8327137: Add test for ConcurrentModificationException in BasicDirectoryModel #18109

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aivanov-jdk mentioned this pull request Mar 13, 2024

8325179: Race in BasicDirectoryModel.validateFileCache #18111

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