ddb(4):
"ddb is invoked upon a kernel panic when the sysctl(8) ddb.panic is set to
1".
I belive this value is default. So, kernel should be dropped into ddb on
panic.
Does it happen?
What exactly do you see on screen along with uvm_fault?
Do you see whole stacktrace?
Check
https://www.openbsd.org/ddb.html
for "Minimum information for kernel problems" section
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