[Gluster-Maintainers] [Gluster-devel] Master branch lock down: RCA for tests ( ./tests/bugs/quick-read/bug-846240.t)

[Raghavendra Gowdappa]

Failure is tracked by bz:
https://bugzilla.redhat.com/show_bug.cgi?id=1615096

<RCA>

Earlier this test did following things on M0 and M1 mounted on same
    volume:
    1 create file  M0/testfile
    2 open an fd on M0/testfile
    3 remove the file from M1, M1/testfile
    4 echo "data" >> M0/testfile

    The test expects appending data to M0/testfile to fail. However,
    redirector ">>" creates a file if it doesn't exist. So, the only
    reason test succeeded was due to lookup succeeding due to stale stat
    in md-cache. This hypothesis is verified by two experiments:
    * Add a sleep of 10 seconds before append operation. md-cache cache
      expires and lookup fails followed by creation of file and hence append
      succeeds to new file.
    * set md-cache timeout to 600 seconds and test never fails even with
      sleep 10 before append operation. Reason is stale stat in md-cache
      survives sleep 10.

    So, the spurious nature of failure was dependent on whether lookup is
    done when stat is present in md-cache or not.

    The actual test should've been to write to the fd opened in step 2
    above. I've changed the test accordingly. Note that this patch also
    remounts M0 after initial file creation as open-behind disables
    opening-behind on witnessing a setattr on the inode and touch involves
    a setattr. On remount, create operation is not done and hence file is
    opened-behind.

</RCA>

Fix submitted at: https://review.gluster.org/#/c/glusterfs/+/20710/

regards,
Raghavendra

On Mon, Aug 13, 2018 at 6:12 AM, Shyam Ranganathan <srangana at redhat.com>
wrote:

> As a means of keeping the focus going and squashing the remaining tests
> that were failing sporadically, request each test/component owner to,
>
> - respond to this mail changing the subject (testname.t) to the test
> name that they are responding to (adding more than one in case they have
> the same RCA)
> - with the current RCA and status of the same
>
> List of tests and current owners as per the spreadsheet that we were
> tracking are:
>
> ./tests/basic/distribute/rebal-all-nodes-migrate.t              TBD
> ./tests/basic/tier/tier-heald.t         TBD
> ./tests/basic/afr/sparse-file-self-heal.t               TBD
> ./tests/bugs/shard/bug-1251824.t                TBD
> ./tests/bugs/shard/configure-lru-limit.t                TBD
> ./tests/bugs/replicate/bug-1408712.t    Ravi
> ./tests/basic/afr/replace-brick-self-heal.t             TBD
> ./tests/00-geo-rep/00-georep-verify-setup.t     Kotresh
> ./tests/basic/afr/gfid-mismatch-resolution-with-fav-child-policy.t Karthik
> ./tests/basic/stats-dump.t              TBD
> ./tests/bugs/bug-1110262.t              TBD
> ./tests/basic/ec/ec-data-heal.t         Mohit
> ./tests/bugs/replicate/bug-1448804-check-quorum-type-values.t
>  Pranith
> ./tests/bugs/snapshot/bug-1482023-snpashot-issue-with-
> other-processes-accessing-mounted-path.t
> TBD
> ./tests/basic/ec/ec-5-2.t               Sunil
> ./tests/bugs/shard/bug-shard-discard.t          TBD
> ./tests/bugs/glusterd/remove-brick-testcases.t          TBD
> ./tests/bugs/protocol/bug-808400-repl.t         TBD
> ./tests/bugs/quick-read/bug-846240.t            Du
> ./tests/bugs/replicate/bug-1290965-detect-bitrotten-objects.t
>  Mohit
> ./tests/00-geo-rep/georep-basic-dr-tarssh.t     Kotresh
> ./tests/bugs/ec/bug-1236065.t           Pranith
> ./tests/00-geo-rep/georep-basic-dr-rsync.t      Kotresh
> ./tests/basic/ec/ec-1468261.t           Ashish
> ./tests/basic/afr/add-brick-self-heal.t         Ravi
> ./tests/basic/afr/granular-esh/replace-brick.t          Pranith
> ./tests/bugs/core/multiplex-limit-issue-151.t           Sanju
> ./tests/bugs/glusterd/validating-server-quorum.t                Atin
> ./tests/bugs/replicate/bug-1363721.t            Ravi
> ./tests/bugs/index/bug-1559004-EMLINK-handling.t                Pranith
> ./tests/bugs/replicate/bug-1433571-undo-pending-only-on-up-bricks.t
>        Karthik
> ./tests/bugs/glusterd/add-brick-and-validate-replicated-volume-options.t
>         Atin
> ./tests/bugs/glusterd/rebalance-operations-in-single-node.t
>  TBD
> ./tests/bugs/replicate/bug-1386188-sbrain-fav-child.t           TBD
> ./tests/bitrot/bug-1373520.t    Kotresh
> ./tests/bugs/distribute/bug-1117851.t   Shyam/Nigel
> ./tests/bugs/glusterd/quorum-validation.t       Atin
> ./tests/bugs/distribute/bug-1042725.t           Shyam
> ./tests/bugs/replicate/bug-1586020-mark-dirty-for-entry-
> txn-on-quorum-failure.t
>         Karthik
> ./tests/bugs/quota/bug-1293601.t                TBD
> ./tests/bugs/bug-1368312.t      Du
> ./tests/bugs/distribute/bug-1122443.t           Du
> ./tests/bugs/core/bug-1432542-mpx-restart-crash.t       1608568
> Nithya/Shyam
>
> Thanks,
> Shyam
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