[Bugs] [Bug 1556972] New: client directory empty with readdir-ahead on

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1556972

            Bug ID: 1556972
           Summary: client directory empty with readdir-ahead on
           Product: GlusterFS
           Version: 3.13
         Component: unclassified
          Assignee: bugs at gluster.org
          Reporter: joe at julianfamily.org
                CC: bugs at gluster.org



Description of problem:
Users are experiencing empty directories at the client. If they know the name
of the dirent they're attempting to use, they still can. For instance, if I
know there's a directory, "foo", in the root of the mount, I can "cd foo" and
it will work. The result of "ls foo" may also be empty despite there being
files or directories there.

Touching a file or directory does not fix this.

There are no log entries on either the client or the brick.

Stopping and starting the volume has no effect.

To work around the issue, disable "performance.readdir-ahead" on the volume.

Version-Release number of selected component (if applicable):
Unclear. This has been happening since at least the 3.10 range and still occurs
as late as 3.13.2.

How reproducible:
seemingly random

Steps to Reproduce:
unknown

Actual results:
$ ls -l /mnt/myvol
$ cat /mnt/myvol/foo
HERE!
$ mkdir /mnt/myvol/bar
$ ls -l /mnt/myvol
$

Expected results:
$ ls -l /mnt/myvol
-rw-r--r-- 1 jjulian jjulian  6 Mar 15 09:09 /mnt/myvol/foo
$ cat /mnt/myvol/foo
HERE!
$ ls -l /mnt/myvol
drwxr-xr-x 2 jjulian jjulian 40 Mar 15 09:10 /mnt/myvol/bar
-rw-r--r-- 1 jjulian jjulian  6 Mar 15 09:09 /mnt/myvol/foo
$

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