Hello.I met a bug about overlayfs again. I run a container by docker . In the container, a symbolic link has been broken.I switch to host, and find the broken file in /var/lib/docker. I find 2 file that one is in /var/lib/docker/overlay2/e3.../merged and another one is in /var/lib/docker/overlay2/e3.../diff. The directory of /var/lib/docker/overlay2/e3.../merged is mounted on overlay fs. The 2 file have same inode. I think this means they are the same file. The file in /var/lib/docker/overlay2/e3.../diff is ok. But the file in /var/lib/docker/overlay2/e3.../merged is broken. I doubt this is a bug of overlayfs. root:/var/lib/docker# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda1 83G 29G 50G 38% / overlay 83G 29G 50G 38% /var/lib/docker/overlay2/e3ed8.../merged ... root:/var/lib/docker# find . -name "libdrv_ip6proen.so" ./overlay2/e3ed8.../diff/usr/lib/libdrv_ip6proen.so ./overlay2/e3ed8.../merged/usr/lib/libdrv_ip6proen.so root:/var/lib/docker# cat overlay2/e3ed8.../merged/usr/lib/libdrv_ip6proen.so cat: overlay2/e3ed8.../merged/usr/lib/libdrv_ip6proen.so: Too many levels of symbolic links root:/var/lib/docker# ls -li overlay2/e3ed8.../merged/usr/lib/libdrv_ip6proen.so ls: cannot read symbolic link 'overlay2/e3ed8.../merged/usr/lib/libdrv_ip6proen.so': Invalid argument 3038490 lrwxrwxrwx 1 root root 26 3 25 16:24 overlay2/e3ed8.../merged/usr/lib/libdrv_ip6proen.so root:/var/lib/docker# ls -li overlay2/e3ed8.../diff/usr/lib/libdrv_ip6proen.so 3038490 lrwxrwxrwx 1 root root 26 3 25 16:24 overlay2/e3ed8.../diff/usr/lib/libdrv_ip6proen.so -> libdrv_ip6proen.so.0.0.0.4 root:/var/lib/docker# stat overlay2/e3ed8.../diff/usr/lib/libdrv_ip6proen.so File: 'overlay2/e3ed8.../diff/usr/lib/libdrv_ip6proen.so' -> 'libdrv_ip6proen.so.0.0.0.4' Size: 26 Blocks: 0 IO Block: 4096 symbolic link Device: 801h/2049d Inode: 3038490 Links: 1 Access: (0777/lrwxrwxrwx) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2019-03-26 16:38:47.588388845 +0800 Modify: 2019-03-25 16:24:05.536041935 +0800 Change: 2019-03-25 16:24:05.536041935 +0800 Birth: - root:/var/lib/docker# stat overlay2/e3ed8.../merged/usr/lib/libdrv_ip6proen.so File: 'overlay2/e3ed8.../merged/usr/lib/libdrv_ip6proen.so'stat: cannot read symbolic link 'overlay2/e3ed8.../merged/usr/lib/libdrv_ip6proen.so': Invalid argument Size: 26 Blocks: 0 IO Block: 4096 symbolic link Device: 801h/2049d Inode: 3038490 Links: 1 Access: (0777/lrwxrwxrwx) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2019-03-26 16:38:47.588388845 +0800 Modify: 2019-03-25 16:24:05.536041935 +0800 Change: 2019-03-25 16:24:05.536041935 +0800 Birth: - root:/var/lib/docker# uname -a Linux z15572-virtual-machine 4.9.29 #1 SMP Tue Oct 16 22:13:48 CST 2018 x86_64 x86_64 x86_64 GNU/Linux root:/var/lib/docker# cat /etc/os-release NAME="Ubuntu" VERSION="16.04.5 LTS (Xenial Xerus)" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 16.04.5 LTS" VERSION_ID="16.04" HOME_URL="http://www.ubuntu.com/"; SUPPORT_URL="http://help.ubuntu.com/"; BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"; VERSION_CODENAME=xenial UBUNTU_CODENAME=xenial
