Bug 413565

Summary:	Kate can hang the whole system by opening a large file
Product:	[Applications] kate	Reporter:	Mark Smith <anonkun>
Component:	application	Assignee:	KWrite Developers <kwrite-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	normal	CC:	christoph, justin.zobel
Priority:	NOR
Version First Reported In:	19.08.2
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Mark Smith 2019-10-28 19:50:46 UTC

SUMMARY
By opening a very large file (say 1Gb or more) with Kate, either by mistake or on purpose, it can hang the whole system forcing the user to reboot or reset.

STEPS TO REPRODUCE

1. Download a large file. I downloaded this and forgot to mark as executable, opened it with Kate by double click https://benchmark.unigine.com/superposition (1.5Gb .run file)
2. Click on the right hand side of the Kate window (text preview pane) or wait a few seconds
3. Apparently, all available ram is filled and the system hangs completely (I have 8Gb of system ram + swap and it hangs pretty much immediately especially if I click on the preview pane) 

EXPECTED RESULT
Either a warning that I'm opening a file too large, or at the very least the program not filling up the entire system ram to the point of hanging the whole system.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Manjaro
KDE Plasma Version: 5.16.5
KDE Frameworks Version: 5.62.0
Qt Version: 5.13.1

Comment 1 Justin Zobel 2020-10-27 08:44:22 UTC

I can confirm that kate does take up a significant amount of RAM to load large files. I opened a 4.4GB movie and while it loaded for me, it did end up in kate using 14,273MB of RAM. I'm lucky to have enough RAM to cater for that.

However maybe a size check on files and a warning if they're over x MB so the user can chose to continue knowing it could take a while.

Comment 2 Christoph Cullmann 2020-12-15 20:32:46 UTC


*** This bug has been marked as a duplicate of bug 411493 ***