[Bugs] [Bug 1611692] New: Mount process crashes on a sharded volume during rename when dst doesn' t exist

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1611692

            Bug ID: 1611692
           Summary: Mount process crashes on a sharded volume during
                    rename when dst doesn't exist
           Product: GlusterFS
           Version: mainline
         Component: sharding
          Severity: high
          Priority: high
          Assignee: bugs at gluster.org
          Reporter: kdhananj at redhat.com
        QA Contact: bugs at gluster.org
                CC: bugs at gluster.org



Description of problem:

Was executing rsync to copy data within a sharded volume. And rsync internally
copies data to a temporary file before renaming it to the actual bname. Hit
this crash.

But then there was a .t specifically meant to test all rename and unlink
scenarios in sharded volumes.

Then the question is - why didn't the tests @ https://bit.ly/2LScry1 and
https://bit.ly/2vbqO6S cause the process to crash? Well, turns out it's because
of a bug in the script itself where the test cases were supposed to test the
scenario where the dst file doesn't exist but the dst path in both tests was
existent as a remnant of the previous tests and never cleaned up prior to
running these tests.

Need to fix both the bug and the test.

Version-Release number of selected component (if applicable):
Only the master branch

How reproducible:
Every time

Steps to Reproduce:
1. Create any volume with shard enabled.
2. Create a file f1 under the mount point.
3. Rename it to f2.
The mount process crashes.
Actual results:


Expected results:


Additional info:

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