After performing series of specific operation Krita gets stuck at high CPU usage. GUI stays partially responsive. I can bring About dialog for example. Closing image is impossible though. 1. New document (for testing purpose let's say: A5 at 300 dpi, 16 bit float/channel) 2. New Fill layer 3. Choose "Color" instead of "Pattern" and hit OK 4. Try deleting layer at bottom of the list (should be "Layer 1") 8 bit images do not exhibit the same problem.
Can fully reproduce on KDE Neon based on Ubuntu 16.04 Fill layers have been behaving oddly for me since the multithreaded brushes branch got merged, but lord knows why. Thanks for your report :)
*** Bug 388317 has been marked as a duplicate of this bug. ***
Interestingly, this doesn't happen on opensuse.
This is caused by this commit: commit f3f864499ed83dd32564b974c4e2be7f61b4c283 Author: Dmitry Kazakov <dimula73@gmail.com> Date: Wed Oct 11 16:06:02 2017 +0300 Post updates to the scheduler in bunches Otherwise, there is an extremely high contention over the queues and updates executes basically in single-threaded mode.
I have no idea why this breaks on Ubuntu and Windows and not on OpenSUSE, though. On my Windows laptop, I do not see this behaviour with krita-nightly-v4.0.0-prealpha.2-465-g8c8c2c91aa.zip
Should be fixed in https://cgit.kde.org/krita.git/commit/?id=79f3a44038b5f7d742956ee7fe31d3bc657d6fe9