To merge KDB or any other RAS tools, you need to deal with kdump. Kdump
hijack panic() before the die calling chain. For KDB or a RAS tool to
work, an infrastructure such as the "add new notifier function" by
Takenori Nagano should be in place.
His last attempt fell short, in my opinion, was partly due to his
"[PATCH 3/3] Move crash_kexec() into panic_notifier" did not do what it
meant to do: to fit kexec/kdump into the new infrastructure. That is
not fatal; it can be fixed to make it right. If community is interested
in getting a kernel debugger to the kernel, we can continue Takenori's
work. Once the infrastructure is accepted, then merging KDB or any other
kernel debugger will make sense.
Regards,
- jay
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