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Type: Bug
Resolution: Done
Priority: Major
Fix Version/s: 3.0.0.Beta3, 2.2.1.CR2
Affects Version/s: None
Component/s: Management
Labels:
None

Steps to Reproduce:
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start or configure WildFly in a Docker environment with overlayfs

invoke backup of config, e.g., by using the cli during build or start script, e.g., /opt/jboss/bin/jboss-cli.sh --file=/opt/jboss/jboss-config.cli
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start or configure WildFly in a Docker environment with overlayfs invoke backup of config, e.g., by using the cli during build or start script, e.g., /opt/jboss/bin/jboss-cli.sh --file=/opt/jboss/jboss-config.cli
Git Pull Request:
https://github.com/wildfly/wildfly-core/pull/2188

Mount point not found exception raised by createTempFileWithAttributes on overlayfs [JDK-8165852], i.e.,

/opt/jboss/bin/jboss-cli.sh --file=/opt/jboss/jboss-config.cli

inside a Docker container running on overlayfs as storage driver

causes (full stack trace below):

java.io.IOException: Mount point not foundImage
    at sun.nio.fs.LinuxFileStore.findMountEntry(LinuxFileStore.java:91)

triggered by

    at org.jboss.as.controller.persistence.FilePersistenceUtils.createTempFileWithAttributes(FilePersistenceUtils.java:117)
    at org.jboss.as.controller.persistence.FilePersistenceUtils.writeToTempFile(FilePersistenceUtils.java:104)

due to OpenJDK bug/overlayfs bug.

We acknowledge that this is in fact an OpenJDK AND/OR overlayfs bug. However everything seems to run fine in WildFly except once the backup of the config is triggered, for example by using the cli. Hence WildFly is of limited functionality when the more and more popular overlayfs storage driver is used, and the WildFly team might be interested in providing a workaround on their side since there is no indication the OpenJDK bug will be promptly fixed. We are happy to help in any way, we are still trying to find a workaround on the Java or WildFly side; but we might need insights on why findMountEntry is invoked.

Full Stack Trace:

 java.io.IOException: Mount point not foundImage
         at sun.nio.fs.LinuxFileStore.findMountEntry(LinuxFileStore.java:91)
         at sun.nio.fs.UnixFileStore.<init>(UnixFileStore.java:65)
         at sun.nio.fs.LinuxFileStore.<init>(LinuxFileStore.java:44)
  at sun.nio.fs.LinuxFileSystemProvider.getFileStore(LinuxFileSystemProvider.java:51)
         at sun.nio.fs.LinuxFileSystemProvider.getFileStore(LinuxFileSystemProvider.java:39)
  at sun.nio.fs.UnixFileSystemProvider.getFileStore(UnixFileSystemProvider.java:368)
         at java.nio.file.Files.getFileStore(Files.java:1461)
         at org.jboss.as.controller.persistence.FilePersistenceUtils.getPosixAttributes(FilePersistenceUtils.java:129)
         at org.jboss.as.controller.persistence.FilePersistenceUtils.createTempFileWithAttributes(FilePersistenceUtils.java:117)
         at org.jboss.as.controller.persistence.FilePersistenceUtils.writeToTempFile(FilePersistenceUtils.java:104)
         at org.jboss.as.controller.persistence.ConfigurationFilePersistenceResource.doCommit(ConfigurationFilePersistenceResource.java:55)
         at org.jboss.as.controller.persistence.AbstractFilePersistenceResource.commit(AbstractFilePersistenceResource.java:58)
         at org.jboss.as.controller.ModelControllerImpl$4.commit(ModelControllerImpl.java:781)
         at org.jboss.as.controller.AbstractOperationContext.executeDoneStage(AbstractOperationContext.java:743)
         at org.jboss.as.controller.AbstractOperationContext.processStages(AbstractOperationContext.java:680)
         at org.jboss.as.controller.AbstractOperationContext.executeOperation(AbstractOperationContext.java:370)
  at org.jboss.as.controller.OperationContextImpl.executeOperation(OperationContextImpl.java:1344)
  at org.jboss.as.controller.ModelControllerImpl.internalExecute(ModelControllerImpl.java:392)
  at org.jboss.as.controller.ModelControllerImpl.execute(ModelControllerImpl.java:204)
  at org.jboss.as.controller.ModelControllerImpl$3.execute(ModelControllerImpl.java:659)
  at org.jboss.as.controller.ModelControllerImpl$3.execute(ModelControllerImpl.java:649)
  at org.jboss.as.controller.client.helpers.DelegatingModelControllerClient.execute(DelegatingModelControllerClient.java:63)
  at org.jboss.as.cli.embedded.ThreadContextsModelControllerClient.execute(ThreadContextsModelControllerClient.java:59)
  at org.jboss.as.cli.handlers.batch.BatchRunHandler.doHandle(BatchRunHandler.java:91)
  at org.jboss.as.cli.handlers.CommandHandlerWithHelp.handle(CommandHandlerWithHelp.java:88)
  at org.jboss.as.cli.impl.CommandContextImpl.handle(CommandContextImpl.java:776)
  at org.jboss.as.cli.impl.CommandContextImpl.handleSafe(CommandContextImpl.java:799)
  at org.jboss.as.cli.impl.CliLauncher.processFile(CliLauncher.java:334)
  at org.jboss.as.cli.impl.CliLauncher.main(CliLauncher.java:262)
  at org.jboss.as.cli.CommandLineMain.main(CommandLineMain.java:45)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:498)
  at org.jboss.modules.Module.run(Module.java:329)
  at org.jboss.modules.Main.main(Main.java:507)

Java Bug Overview:

https://bugs.openjdk.java.net/browse/JDK-8165852

http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/8u40-b25/sun/nio/fs/LinuxFileStore.java#91

Wildfly Stack Overflow issue, not solved:

https://stackoverflow.com/questions/41022393/mount-point-not-found

Background Info:

http://mail.openjdk.java.net/pipermail/nio-dev/2016-October/003915.html

A) chroot environment [1]
B) Docker container with overlay and overlay2 storage drivers [2]
C) btrfs file system with an unmounted sub-volume [2]

[1] https://bugs.openjdk.java.net/browse/JDK-8165323 - cannot get FileStore in chroot environment
[2] https://bugs.openjdk.java.net/browse/JDK-8165852 - cannot get FileStore for a file in overlayfs in Docker

Docker file system/storage driver:

https://docs.docker.com/engine/userguide/storagedriver/selectadriver/)

Yum yum-plugin-ovl, similar problem: