Well, after 3 days of bisection, I finally found the commit
that renders my system unbootable. The system does not panic.
It simply gets stuck in some state. Nonfunctional keyboard,
so can't break into debugger. No serial console available.
The verbose dmesg.boot for a working kernel from revision
309656 is at
The kernel config file is at
In looking at /usr/src/UPDATING, there is no warning that one
can create a boat anchor by upgrading to 309657. If compiling
a kernel with 'options DDB' is no longer supported, this should
be stated in UPDATING. Or, UPDATING should state that 'options
DDB' requires 'options STACK'. Or, 'options DDB' should simply
to the right thing and pull in whatever 'option STACK' does.
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