Re: System lockups on 14-current with Plasma 5

On 7/3/23 18:20, Patrick McMunn wrote:
> I was just wondering if anyone else has experienced random freezes where 
> everything except the mouse cursor becomes completely unresponsive.
> 
> This began when I would come to my computer in the morning and find the 
> screen black and the system in sleep mode. It would not wake up to 
> keypresses or mouse movement. So I disabled power management in Plasma 
> 5. This still happened after disabling power management, so I disabled 
> the screensaver. That's when I would come to find my computer in the 
> morning with the screen still on, but as soon as I would click on 
> anything, everything but the cursor would freeze. At first, I thought it 
> would happen only after being idle a long time. But then it began to 
> happen while actively using the system after even a short time like less 
> than an hour. It progressively became more frequent over a few days 
> until it would happen immediately upon logging into Plasma 5.
> 
> I originally installed 14-current onto a spare laptop hard drive that I 
> installed on a secondary SATA port on my desktop just so I could test 
> it. But after these issues occurred, I suspected a faulty hard drive and 
> decided to install 14-current onto my main hard drive in a separate 
> partition alongside Windows 10 and Gentoo. I went ahead and disabled 
> sleep power management and the screensaver on the new installation. But 
> I soon began  to experience random lockups during use.
> 
> I installed Gnome 3, LXQT, and Cinnamon desktops to try as alternatives. 
> Maybe I haven't tested enough, but I have yet to experience any lockups 
> with these other desktop environments.
> 
> I had previously run Plasma 5 from quarterly on 13.2-release without any 
> lockups. So maybe it's an issue with Plasma 5 from the latest repo. It's 
> hard to know since there apparently is no quarterly repo available for 
> 14-current. So it's unclear whether the issue is with the latest Plasma 
> 5 or some compatibility issue with Plasma 5 on 14-current that I did not 
> experience on 13.2-release.

Hi,

I experienced some similar symptoms a while back on -current with KDE.

After some investigation I found that the system was panicking due to 
some failed debug assertion triggered by the nvidia graphics driver. As 
a result, the system would drop to the debugger, but was unable to 
switch virtual terminals, so it appeared to hang. My solution was just 
to start running the GENERIC-NODEBUG kernel instead.

Does the system respond to network pings after the lock-up occurs? If 
not then perhaps you are experiencing this type of silent panic. You can 
set the debug.debugger_on_panic sysctl value to 0, which should result 
in an immediate reboot+kernel dump when such a panic occurs.

Hope it helps.

Mitchell