Reporting graph (bar, line) reads only: Graphical report results

[Zarko Dudic]

Hallo,

I've been working to upgrade very old Bugzilla installation, and have a peculiar problem relevant only for graph reporting.
I find it difficult to troubleshoot when there are no clear logs and errors, so I hope someone may experience same and have a feedback.
The origin installation is on RedHat (or its clone) 5, with Bugzilla 4.0 and MySQL 5.0.

Step 1.
>From original, MySQL import data to new instance RHEL 6, Bugzilla 4.0 and MySQL5.5. Look good.

Step 2.
Bugzilla Git upgrade from 4.0 to 4.2. No change with RHEL6 and MySQL 5.5. Looks good.

Step 3-1.
Bugzilla Git upgrade from 4.2 to 4.4. No change with RHEL6 and MySQL 5.5.
Reporting graph (bar and line) problem appear here. Instead of graph, the page only reads "Graphical report results".
The reports like table and CSV works as expected. Sanity check doesn't read any problems.

Step 3-2.
Alternatively, from instance in step 2 (RHEL 6 with Bugzilla 4.2), the MySQL 5.5 data was imported to RHEL 7, with Bugzilla 4.2 (with MySQL 5.5).
And same reporting problem appear on new RHEL 7 instance.

Step 4. From here, with some intermediate steps, I can upgrade to latest supported versions, RHEL7, Bugzilla 5.0.6 and MySQL 5.7.
But reporting graph (bar, line) problem is always present. After every upgrade step, the sanity check doesn't report any issues.


Thanks,
Zarko

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