Looks a bit like garbage that occurs when processor caches are not handled correctly. Have there been kernel updates lately that messed with that? The /arch subtree of the kernel is a wild jungle for the ARM architecture with scary beasts cowering within...
FWIW, I've had sudden reboots on my PW lately, too. But I blame that on the indexer being a catastrophic mess - I'm still on an ancient firmware version and the device hasn't had Wifi on for a long time and was generally off the USB line when the reboots happened. Plus, they only occured after sideloading my latest batch of literature. That's pretty obvious in my eyes.
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