[Libreoffice-bugs] [Bug 134379] New: OOM/Unresponsive when the entire searched column is selected again after display of 'Search Results' dialog (for 'Find All') and searching for a non-existent pattern

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=134379

            Bug ID: 134379
           Summary: OOM/Unresponsive when the entire searched column is
                    selected again after display of 'Search Results'
                    dialog (for 'Find All') and searching for a
                    non-existent pattern
           Product: LibreOffice
           Version: 6.4.4.2 release
          Hardware: x86-64 (AMD64)
                OS: Windows (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Calc
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: vijayachandra+libre at gmail.com

Description:
Calc becomes completely unresponsive with the one specific use of the 'Find &
Replace' option.
When 'Find All' results in some matches, the 'Search Results' dialog opens up
highlighting the matches in the column(s) selected.
If you now close the 'Search Results' dialog and try searching another pattern
using the same 'Find & Replace' dialog, the entire application becomes
unresponsive in case the searched pattern does not exist in the searched
column(s).
Memory consumption of LibreOffice shoots up from 50MB to about 5.5GB and after
some time it shows the searched text in red indicating that the pattern is not
found.
However it continues to use CPU (one core) and continues to be extremely
sluggish/unresponsive.


Steps to Reproduce:
1. Open any new or existing spreadsheet in Calc
2. Enter "one" in A1 and "two" in A2 (without quotes)
3. Select column A by clicking on 'A' in the header
4. Open "Find & Replace" in the Edit Menu (or Ctrl+H)
5. In the "Find" text box type "two" (without quotes)
6. Click on "Find All"
7. A2 is highlighted now to show the match
8. Close the "Search Results" dialog that pops up
9. Select column A again (as in step 2) by clicking on 'A' in the header
10. In the "Find & Replace" dialog that is still open, in the "Find" text box
type "three"
11. Click on "Find All"

Actual Results:
Calc hangs consuming more than 5 GBs of RAM and stays unresponsive even after
displaying that no matches are found after a while

Expected Results:
Calc should immediately respond with the indication that the match is not found
in the document and NOT consume 5 GBs of RAM


Reproducible: Always


User Profile Reset: Yes



Additional Info:
Version: 6.4.4.2 (x64)
Build ID: 3d775be2011f3886db32dfd395a6a6d1ca2630ff
CPU threads: 12; OS: Windows 10.0 Build 18363; UI render: default; VCL: win; 
Locale: en-US (en_US); UI-Language: en-US
Calc: threaded

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