<![CDATA[QtCreator freezes von Ubuntu 26.04 after canceling the build]]>I'm having an annoying problem here. I'm mostly developing in Windows using Visual Studio, but I also provide Linux builds of my application. I was using an XUbuntu 22 up to now.

I'm doing that in a Virtual Box VM.

Now I'm trying to migrate to Ubuntu 26.04. It works, I can build and run the application, but when I cancel a build the build stops and then QtCreator freezes.

And it freezes to a degree where I cannot close it, cannot kill it (neither -9 nor SIGKILL). I cannot even reboot the VM. I have to kill all Virtual Box processes in the Windows task manager.

I found no solution for that.

I tried both LUbuntu and XUbuntu. After a while, the OS says the window is busy and not responding and offers to close it. But it won't resume work after restarting. It hangs at "Loading Session".

Probably because the build processes are all still there:

2970  0.0  0.0   9904  3492 ?        D    22:39   0:00 g++ -c -pipe -g -Wall -Wextra -Wno-unused-parameter -Wno-unused-variable -D_REENTRANT -DQT_Q
2971  3.0 15.3 721628 615420 ?       D    22:39   0:03 /usr/libexec/gcc/x86_64-linux-gnu/15/cc1plus -quiet -I ../../../MyProject -I . -I ../../../My
2972  0.0  0.1  11876  4440 ?        S    22:39   0:00 /bin/x86_64-linux-gnu-as -I ../../../MyMyProject -I . -I ../../../MyProject -I ../../../MyProject
2973  0.0  0.0   9904  3488 ?        D    22:39   0:00 g++ -c -pipe -g -Wall -Wextra -Wno-unused-parameter -Wno-unused-variable -D_REENTRANT -DQT_Q
2974  2.6 15.4 725892 617020 ?       D    22:39   0:03 /usr/libexec/gcc/x86_64-linux-gnu/15/cc1plus -quiet -I ../../../MyProject -I . -I ../../../My
2975  0.0  0.1  11876  4468 ?        S    22:39   0:00 /bin/x86_64-linux-gnu-as -I ../../../MyProject -I . -I ../../../MyProject -I ../../../MyProject
2976  0.0  0.0   9904  3488 ?        D    22:39   0:00 g++ -c -pipe -g -Wall -Wextra -Wno-unused-parameter -Wno-unused-variable -D_REENTRANT -DQT_Q
2977  0.1  0.5  68732 22992 ?        D    22:39   0:00 /usr/libexec/gcc/x86_64-linux-gnu/15/cc1plus -quiet -I ../../../MyProject -I . -I ../../../Myi
2978  0.0  0.1  11876  4364 ?        S    22:39   0:00 /bin/x86_64-linux-gnu-as -I ../../../MyProject -I . -I ../../../MyProject -I ../../../MyProject
2979  0.0  0.0   9904  3488 ?        D    22:39   0:00 g++ -c -pipe -g -Wall -Wextra -Wno-unused-parameter -Wno-unused-variable -D_REENTRANT -DQT_Q
2980  0.0  0.5  68404 21552 ?        D    22:39   0:00 /usr/libexec/gcc/x86_64-linux-gnu/15/cc1plus -quiet -I ../../../MyProject -I . -I ../../../My
2981  0.0  0.1  11876  4464 ?        S    22:39   0:00 /bin/x86_64-linux-gnu-as -I ../../../MyProject -I . -I ../../../MyProject -I ../../../MyProject

Probably QtCreator couldn't kill them either.

I'm using QtCretor 18.0.2 Based on Qt 6.10.2 (GCC 15.2.0, x86_64)

What has to be changed so that QtCreator properly kills all those processes upon cancelling a build?

]]>https://forum.qt.io/topic/164856/qtcreator-freezes-von-ubuntu-26.04-after-canceling-the-buildRSS for NodeWed, 08 Jul 2026 11:58:44 GMTSat, 04 Jul 2026 20:48:47 GMT60<![CDATA[Reply to QtCreator freezes von Ubuntu 26.04 after canceling the build on Tue, 07 Jul 2026 19:30:06 GMT]]>@SGaist

I installed QtCreator 20.0.0, but unfortunately the problem is the same.

]]>https://forum.qt.io/post/839043https://forum.qt.io/post/839043Tue, 07 Jul 2026 19:30:06 GMT<![CDATA[Reply to QtCreator freezes von Ubuntu 26.04 after canceling the build on Mon, 06 Jul 2026 19:03:32 GMT]]>I remember there was a post not long ago with similar symptoms. Can you try a more recent version of Qt Crestor ?

]]>https://forum.qt.io/post/839032https://forum.qt.io/post/839032Mon, 06 Jul 2026 19:03:32 GMT<![CDATA[Reply to QtCreator freezes von Ubuntu 26.04 after canceling the build on Sun, 05 Jul 2026 21:35:59 GMT]]>@SGaist

It's set to 4 (-j4), but setting it to 1 doesn't help.

]]>https://forum.qt.io/post/839018https://forum.qt.io/post/839018Sun, 05 Jul 2026 21:35:59 GMT<![CDATA[Reply to QtCreator freezes von Ubuntu 26.04 after canceling the build on Sun, 05 Jul 2026 18:50:30 GMT]]>Hi and welcome to devnet,

Are you handling the number of jobs yourself ?
If so, how many are you starting in parallel ?

]]>https://forum.qt.io/post/839017https://forum.qt.io/post/839017Sun, 05 Jul 2026 18:50:30 GMT