[Libreoffice-bugs] [Bug 128572] New: Crash LibreOffice Calc when running python script importing matplotlib.pyplot

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=128572

            Bug ID: 128572
           Summary: Crash LibreOffice Calc when running python script
                    importing matplotlib.pyplot
           Product: LibreOffice
           Version: 6.0.7.3 release
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Calc
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: bill.a.lucyk at gmail.com

Description:
I have a script that runs in LibreOffice Calc that uses matplotlib.pyplot.
It used to work on a daily basis, but I ran it yesterday, (after a gap of maybe
2 months) and it crashed libreoffice.

Through trial and error I narrowed down the last statement run before the crash
to  "import matplotlib.pyplot as plt".  When I removed the statement, the
script ran without a crash.

I moved the "import matplotlib.pyplot as plt" line down to after the logging
started, and this message came out in the log before the crash occurred: 
"Loaded backend qt5agg version unknown."  QT5Agg is a "Backend" for pyplot,
i.e., it provides lower-level graphics support for the drawing of the chart
images.

If I put this in a python script outside of the libreoffice environment (for
example, in a jupyter notebook, or a standalone python script), it doesn't
crash.

I'm wondering whether LO cannot access the backend QT5Agg, and that's why this
crash is happening.

As I say, this used to work fine every time, and after no changes to the script
it crashes Libreoffice, this would have occurred over perhaps the last 2
months.  I've been keeping my software up-to-date.

Python : 3.6.8
Matplotib : 3.1.1
Kubuntu 18.04
KDE: 5.12.9
QT : 5.9.5



Steps to Reproduce:
1.  Create python script with the following lines of code:  (I'm assuming that
it would be necessary to match the OS, LO version, etc.)  This is a simplified
script that I hope will suffice for bug reporting purposes)

import matplotlib
import matplotlib.pyplot as plt

def ThisBreaksinLO():
    pass

2.  Open an empty Calc spreadsheet and run the script
3.  It will cause LO to crash

Actual Results:
LibreOffice crashed

Expected Results:
The script will run without crashing LibreOffice.  The script does not do
anything but load the modules.


Reproducible: Always


User Profile Reset: No



Additional Info:
Version: 6.0.7.3
Build ID: 1:6.0.7-0ubuntu0.18.04.10
CPU threads: 4; OS: Linux 4.15; UI render: default; VCL: kde4; 
Locale: en-CA (en_CA.UTF-8); Calc: group

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/libreoffice-bugs/attachments/20191103/50b63f89/attachment.html>