[Bugs] [Bug 1510401] New: fstat returns ENOENT/ESTALE

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1510401

            Bug ID: 1510401
           Summary: fstat returns ENOENT/ESTALE
           Product: GlusterFS
           Version: mainline
         Component: fuse
          Assignee: bugs at gluster.org
          Reporter: rgowdapp at redhat.com
                CC: bugs at gluster.org



Description of problem:
In a multithreaded application if following test is repeated one might end up a
failed fstat with ENOENT/ESTALE error:

* Turn off performance.open-behind.
* Thread t1 opens an fd on file 
* file is unlinked or overwritten by a rename - say rename (newfile, file)
* Thread t2 does fstat (fd)

Version-Release number of selected component (if applicable):
Day 0 bug, present in all versions.

How reproducible:
Race but reproducible fairly consistently

Steps to Reproduce:
1. Turn off performance.open-behind
2. Thread t1 opens an fd on file
3. file is unlinked or overwritten by a rename - say rename (newfile, file)
4. Thread t2 does fstat (fd)

Actual results:
sometimes fstat fails with ENOENT/ESTALE

Expected results:
fstat should never fail as there is an fd opened on the file.

Additional info:

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