Sydney, I'm trying to isolate the problem and take RT out of the picture
first.

I'm confused by your statement:
> To be serious I never really looked on non RT patched releases on Ubuntu 
> 24.04.

The bug description states:
> Kernel 6.8.0-1020-raspi:
> [130.086150] mcp251xfd spi0.0 can0: IRQ handler mcp251xfd_handle_tefif() 
> returned -22 (intf=0x31aa018).
> [130.086464] mcp251xfd spi0.0 can0: IRQ handler returned -22.

This indicates that the non-RT 6.8.0-1020-raspi kernel also has
problems.

Based on all the information in this bug, is the following correct?

6.8.0-1020-raspi - BAD
6.8.0-1028-raspi - GOOD
6.8.0-1028-raspi (+cbd1) - GOOD

6.8.0-2019-raspi-realtime - BAD
6.8.0-2023-raspi-realtime - BAD

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https://bugs.launchpad.net/bugs/2109529

Title:
  MCP251xFD Driver Failure on Ubuntu with CAN Interface

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