java.io.IOException

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  • FULL PRODUCT VERSION : java version "1.8.0_77" Java(TM) SE Runtime Environment (build 1.8.0_77-b03) Java HotSpot(TM) 64-Bit Server VM (build 25.77-b03, mixed mode) ADDITIONAL OS VERSION INFORMATION : [root@6b8ab63d2271 /]# uname -a Linux 6b8ab63d2271 4.6.0-0.bpo.1-amd64 #1 SMP Debian 4.6.3-1~bpo8+1 (2016-07-13) x86_64 x86_64 x86_64 GNU/Linux [root@6b8ab63d2271 /]# cat /etc/redhat-release CentOS Linux release 7.2.1511 (Core) EXTRA RELEVANT SYSTEM CONFIGURATION : Host System: Debian Jessie Runs Docker version 1.12.1, build 23cf638 started with --storage-driver=overlay Error does occur inside of the docker container which is centos 7 A DESCRIPTION OF THE PROBLEM : When running java inside of a docker container which root fs is an overlayfs e.g. from mount: overlay on / type overlay (rw,relatime,lowerdir=/var/lib/docker/overlay/7f380aa866f1411985b0e3d9533e89f0907e11adb81c2c1e20a5733fd3112f33/root,upperdir=/var/lib/docker/overlay/58f650cc4005e9becf01c20b2d8144a372115d11add9e70774322232e3fef590/upper,workdir=/var/lib/docker/overlay/58f650cc4005e9becf01c20b2d8144a372115d11add9e70774322232e3fef590/work) And accessing a file like /home/someuser/somefile.txt An Exception will be thrown. A very similar Case seems to exist with btrfs and subvolumes: https://github.com/elastic/elasticsearch/issues/14337 and https://github.com/elastic/elasticsearch/issues/12018 STEPS TO FOLLOW TO REPRODUCE THE PROBLEM : Start a docker container where dockerd was started with --overlfay and try to access files via Files.getFileStore(path) EXPECTED VERSUS ACTUAL BEHAVIOR : EXPECTED - The Result should be / (if there is no other mount) ACTUAL - java.io.IOException: Mount point not found ERROR MESSAGES/STACK TRACES THAT OCCUR : Exception in thread "main" java.io.IOException: Mount point not found 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 MyMain.main(MyMain.java:8) REPRODUCIBILITY : This bug can be reproduced always. ---------- BEGIN SOURCE ---------- import java.io.IOException; import java.nio.file.Files; import java.nio.file.Paths; public class MyMain { public static void main(String[] args) throws IOException { System.out.println(Files.getFileStore(Paths.get(args[0]))); } } ---------- END SOURCE ----------
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  • GitHub comment 44#290935503
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  • GitHub comment 14337#187287879
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  • Mount point not found
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    • java.io.IOException: Mount point not found 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 MyMain.main(MyMain.java:8)
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