[Libreoffice-bugs] [Bug 121356] New: One CPU used at 100% with no document opened, until mouse passing over window

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=121356

            Bug ID: 121356
           Summary: One CPU used at 100% with no document opened, until
                    mouse passing over window
           Product: LibreOffice
           Version: 6.1.3.2 release
          Hardware: All
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: LibreOffice
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: mjulier at free.fr

Description:
When LibreOffice is launched but NOT being used, including when no document at
all is opened, one CPU core gets used at almost 100% after some time (approx. 1
minute), by the process "soffice.bin".

When I show the LibreOffice window (using the task bar on the window manager),
nothing changes. No change, either, when I move the mouse on the title bar
(File, Tools, Help), or on the left column (Open a file, Distant files, Recent
files,...).

However, whenever I move the mouse over any of the recent file icons, displayed
in the main part of the window when no document is opened, the CPU usage goes
to 0,0%. Moving the mouse over the gray area between the icons has no effect,
the CPU goes down only when the mouse is over an icon (icon displayed with a
bright frame and an "X" in the upper-right corner).

After a while (I measured a delay of 39 minutes, then a delay of 12 minutes: it
seems somewhat random), the CPU suddenly goes to 100% once again.

I just tested it on LibreOffice 6.1, but I observe a similar behavior on much
earlier versions, sure for 5.4, but probably it comes from much before.

I think it happens every time, but the delay is so long that it might be
difficult to tell for sure.

I tried to leave for hours, in case it would be due to some background work
such as indexing or compiling, but the CPU use stays at 100% even after several
hours.

Steps to Reproduce:
1. Launch LibreOffice
2. Use Calc to do some work
3. Close all documents
4. Leave LibreOffice idle, take care not to move the mouse over its window
5. Wait for some time (1 hour is usually sufficient)
6. Type "top" (on Linux) and see that soffice.bin is using almost 100% of one
CPU

Actual Results:
soffice.bin: CPU use = 90% to 100%

Expected Results:
soffice.bin: CPU use = 0%


Reproducible: Always


User Profile Reset: No


OpenGL enabled: Yes

Additional Info:
Version: 6.1.3.2
Build ID: 86daf60bf00efa86ad547e59e09d6bb77c699acb
Threads CPU : 2; OS : Linux 4.15; UI Render : par défaut; VCL: gtk2; 
Locale : en-IE (fr_FR.UTF-8); Calc: group threaded

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