[Bug 2063353] Re: [SRU] plasma-discover backends race condition cause GUI not to load
Hi, I'm concerned with this this bug, using only Discover with the "strace plasma-discover" command line solve the problem on my computer. Tell me if needed to put some extra informations. My system: Ubuntu Studio 24.04/KDE Plasma 5.27.11/Qt 5.15.13/Core 6.8.0-47-low latency (64bits)/graphics X11 Tank you very much. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2063353 Title: [SRU] plasma-discover backends race condition cause GUI not to load To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-discover/+bug/2063353/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2063353] Re: [SRU] plasma-discover backends race condition cause GUI not to load
Addition to my previous comment (#9) In the files org.kde.discover.apt.urlhandler.desktop org.kde.discover.desktop org.kde.discover.snap.desktop org.kde.discover.urlhandler.desktop I change all exec lines to Exec=plasma-discover %U --backends kns-backend,snap-backend,packagekit- backend Take a close look at these files, some have more than one exec line. Allthough sometimes I still have to quit a leftover running plasma-discover application via "System Monitor" > "Applications" to be able to open a new discover window. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2063353 Title: [SRU] plasma-discover backends race condition cause GUI not to load To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-discover/+bug/2063353/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2063353] Re: [SRU] plasma-discover backends race condition cause GUI not to load
Dear maintainers, I am also experiencing this issue in kubuntu 24.04 with kde 5.27.11 which makes Discover unusable. I came here to ask if there is any plan for backporting the fix (for plasma 6) that solved the upstream bug? Thanks in advance. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2063353 Title: [SRU] plasma-discover backends race condition cause GUI not to load To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-discover/+bug/2063353/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2063353] Re: [SRU] plasma-discover backends race condition cause GUI not to load
I can confirm the statement of Adrian (comment #5). As a workaround I added the option "--backends snap-backend,packagekit-backend" to the following .deskop-files: org.kde.discover.apt.urlhandler.desktop org.kde.discover.desktop org.kde.discover.snap.desktop org.kde.discover.urlhandler.desktop Seems to work properly now, now leftovers in system monitor after closing discover which prevent launching discover's gui before. OS: Ubuntu Studio 24.04 Kernel 6.8.0-35-lowlatency Graphics Platform: X11 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2063353 Title: [SRU] plasma-discover backends race condition cause GUI not to load To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-discover/+bug/2063353/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2063353] Re: [SRU] plasma-discover backends race condition cause GUI not to load
I recently updated from Kubuntu 23.10 to 24.04 and started to notice this issue. to same issue here with is random, suddenly will start working. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2063353 Title: [SRU] plasma-discover backends race condition cause GUI not to load To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-discover/+bug/2063353/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2063353] Re: [SRU] plasma-discover backends race condition cause GUI not to load
I think I can now report we can reliably repeat this in a live environment. I re-ran the aforementioned script in a freshly booted live environment (I had been reusing the same one all throughout the chronology of the last comment) and was able to reproduce the behavior, more or less. After 300 tests, I had amassed 103 failures, amounting to a 34.33% failure rate. It seems you need to run `plasma-discover --backends packagekit- backend,snap-backend` at least 5-6 times before you are going to get a failure. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2063353 Title: [SRU] plasma-discover backends race condition cause GUI not to load To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-discover/+bug/2063353/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2063353] Re: [SRU] plasma-discover backends race condition cause GUI not to load
This is a difficult one to reproduce consistently, but it is most certainly an issue. I had a relatively fresh installation and went through the following to get it to happen (meaning it worked every time until the last line): plasma-discover --backends packagekit-backend plasma-discover --backends snap-backend plasma-discover --backends snap-backend,packagekit-backend plasma-discover --backends packagekit-backend,snap-backend plasma-discover plasma-discover plasma-discover --backends packagekit-backend,snap-backend Using a live ISO, I made a little script to continuously run through that pattern and was actually able to get it to fail eventually. I found that the failures only occurred with the packagekit-backend,snap-backend call. I then modified the script to only do this one call and keep track of the total number of tests and total number of failures (as tested by checking to see if the window was open by grepping for Discover in `wmctrl -lp` after a sensible wait time) and was able to reproduce with some degree of regularity. In particular, after 300 tests, I had amassed 113 failures, amounting to a 37.7% failure rate. Definitely a race condition seemingly related to threading if the upstream bug is to be believed. This is with Lubuntu 24.04 in an X session and a generic kernel, I might add. ** Changed in: plasma-discover (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2063353 Title: [SRU] plasma-discover backends race condition cause GUI not to load To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-discover/+bug/2063353/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2063353] Re: [SRU] plasma-discover backends race condition cause GUI not to load
I'm having the same problem but I've noticed one marginally interesting point: plasma-discover --backends snap-backend,packagekit-backend(Works) plasma-discover --backends packagekit-backend,snap-backend(Does not work) The only difference is the order of the backends. Operating System: Kubuntu 24.04 KDE Plasma Version: 5.27.11 KDE Frameworks Version: 5.115.0 Qt Version: 5.15.13 Kernel Version: 6.8.0-31-generic (64-bit) Graphics Platform: Wayland Processors: 4 × Intel® Core™ i5-4570 CPU @ 3.20GHz Memory: 23.4 GiB of RAM Graphics Processor: Mesa Intel® HD Graphics 4600 Manufacturer: Hewlett-Packard Product Name: HP EliteDesk 800 G1 SFF -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2063353 Title: [SRU] plasma-discover backends race condition cause GUI not to load To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-discover/+bug/2063353/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2063353] Re: [SRU] plasma-discover backends race condition cause GUI not to load
Interestingly enough, I cannot reproduce this on a "clean" Ubuntu Studio system or a live .iso of Ubuntu Studio. Only on my existing /home, and even after deleting all configs and cache related to discover. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2063353 Title: [SRU] plasma-discover backends race condition cause GUI not to load To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-discover/+bug/2063353/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2063353] Re: [SRU] plasma-discover backends race condition cause GUI not to load
I have asked on the upstream bug https://bugs.kde.org/show_bug.cgi?id=481993 My ability to backport that patch is a no go, the code is much to different. ** Bug watch added: KDE Bug Tracking System #481993 https://bugs.kde.org/show_bug.cgi?id=481993 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2063353 Title: [SRU] plasma-discover backends race condition cause GUI not to load To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-discover/+bug/2063353/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2063353] Re: [SRU] plasma-discover backends race condition cause GUI not to load
I can't reproduce this on Kubuntu. I tried applying the patch from the bug report and it failed... so I guess this needs further investigation.. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2063353 Title: [SRU] plasma-discover backends race condition cause GUI not to load To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-discover/+bug/2063353/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 2063353] Re: [SRU] plasma-discover backends race condition cause GUI not to load
** Description changed: [Impact] It has been found that under many circumstances, plasma-discover will not load if more than one backend is present. This was first discovered in plasma-discover 6.0 but the same code seems to be also present in - plasma-discover 5.27.11. Bug fix is found at + plasma-discover 5.27.11. Similar bug fix is found at https://bugs.kde.org/show_bug.cgi?id=481993. For instance, if plasma- discover is loaded with just the packagekit backend, it will load. If it is loaded with just the snap backend, it will load. If it is loaded with both, the GUI will not load. [Test Case] From the terminal: * $ plasma-discover --backends packagekit-backend * (will load normally) * $ plasma-discover --backends snap-backend * (will load normally) * $ plasma-discover --backends packagekit-backend,snap-backend * (will fail) [What could go wrong] It's possible that, though tested, the fix in the aforementioned bug will not work as it would be a backport from plasma-discover 6.0. However, this seems unlikely as it's highly tested at this point. ProblemType: Bug DistroRelease: Ubuntu 24.04 Package: plasma-discover 5.27.11-0ubuntu2 ProcVersionSignature: Ubuntu 6.8.0-31.31.1-lowlatency 6.8.1 Uname: Linux 6.8.0-31-lowlatency x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.28.1-0ubuntu2 Architecture: amd64 CasperMD5CheckResult: pass CurrentDesktop: KDE Date: Wed Apr 24 08:52:15 2024 InstallationDate: Installed on 2024-04-15 (9 days ago) InstallationMedia: Ubuntu-Studio 24.04 LTS "Noble Numbat" - Beta amd64 (20240410.2) SourcePackage: plasma-discover UpgradeStatus: No upgrade log present (probably fresh install) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2063353 Title: [SRU] plasma-discover backends race condition cause GUI not to load To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-discover/+bug/2063353/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
