I can not kill
kill -9 or
pkill -f -9.
Does anyone how to kill or stop those process?
As @hobbs explained, it is a kernel thread. More wide perspecive is the following:
IRQ handling is a problematic thing in any OSes, because interrupt can came any time, even if the kernel works in the moment on a complex task and many resources are inconsistent (pointers are pointing to invalid addresses and so on). This can be solved by locks, i.e. we don't allow the interrupt handlers to run until again a breakable, consistent state isn't reached. It has the major disadvantage, that too many locks are making the system slow and ineffective.
Thus, the optimal solution for the problem is this:
These are the interrupt handler kernel threads. These are kernel threads, namely:
topas normal processes,
They are essentially in the background running threads of the kernel.
You can't kill kernel threads, they are managed entirely by the kernel. If you could kill them, the irq/142 handler in your nvidia driver wouldn't exist any more, i.e. if your videocard sends an interrupt, nothing would handle it. The result would be likely a freeze, but your video surely wouldn't work any more.
Now the problem in your system is that this interrupt handler gets a lot of CPU resource. It can have many reasons:
Knowing the quality of the nvidia drivers, unfortunately this last version is the most likely.
The solution is to somehow reset this driver. Some ideas, ordered ascending by brutality:
If you killed X and there is still that kernel thread, you may try to remove the nvidia kernel module (you can see it in the list given by
lsmod, then you can remove it by
rmmod). Restarting X will insmod it automatically, resetting the hardware.
If nothing works, you need to reboot. If even the ordinary reboot don't work, you can do this with additional brutality, with and alt/printscreen/s following by an alt/printscreen/b.
Extension: as a temporary workaround, you may try to give a very low priority to that task (
renice +20 -p 1135). Then it will still run, but it will harm much lesser your system performance.
You can't. It's not a process, it's a kernel thread. You can't kill it, and if you did manage to you would only make your system (more) unusable.