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How to get debug information?

I'm testing the new Nvidia driver module with drm enabled. It is very experimental so I know there are bugs in it. I think I found a problem and I want to get more information about it from the log messages, but the whole system freezes. I can't ssh into the system or change to a tty. After a hard reboot the last lines in journalctl are:
	kernel: usb 2-1.7: current rate 0 is different from the runtime rate 48000
	Failed to get journal fields
Not very useful
Is there a way to get more information?


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