https://bugs.kde.org/show_bug.cgi?id=353983

--- Comment #83 from Nick <nick.craig....@gmail.com> ---
I can't post the actual error bugs.kde.org keeps telling me its spam !

Anyway ...
Just had the panel rendering freeze again, was using with kmail at the time, so
did a bit of detective work. As I had enabled seconds on the panel clock it
gives me a time to look for in the logs. So the panel froze at 00:13:35.

Looking at /var/log/syslog, the following entry exists at 00:13:33 that's
relevant to the GPU. There was nothing else around that time that was unusual.

This URL explains the error I'm getting
http://docs.nvidia.com/deploy/xid-errors/index.html#topic_5_2

This error is inserted into /var/log/syslog by the Nvidia driver and indicates
an error. If I've understood this correctly, this is XID error 31.

So I looked up the NVidia documentation which states: 

XID 31: Fifo: MMU Error
This event is logged when a fault is reported by the MMU, such as when an
illegal address access is made by an applicable unit on the chip Typically
these are application-level bugs, but can also be driver bugs or hardware bugs.

When this event is logged, NVIDIA recommends the following:

Run the application in cuda-gdb or cuda-memcheck , or
Run the application with CUDA_DEVICE_WAITS_ON_EXCEPTION=1 and then attach later
with cuda-gdb, or
File a bug if the previous two come back inconclusive to eliminate potential
NVIDIA driver or hardware bug.

Note: The cuda-memcheck tool instruments the running application and reports
which line of code performed the illegal read.

The cuda-memcheck tool sounds like it might be very useful for tracking down
this bug.

Has anybody tried running cuda-memcheck with plasma ? Is it even possible ?

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