Sorry. I had those strange C++ messages as well.
Someone else had a similar problem. They took the Xavier that had the problem and installed it on an AGX devkit and the problem was not present.
It turned out that their custom device did not have an sdcard interface - disabling the sdcard solved the problem.
Your error seems to be an sdcard issue as well -
31.584801 Workqueue: events sdhci_delayed_detect
Try disabling the sdcard in your DTSI - 3400000.sdhci status = “disabled”;
It worked for them.
Good luck,
Larry @ FLIR