Add code to drop to ddb when a process gets a fatal signal that usually suggests kernel bugs (4, 10, 11).  Add a sysctl debug.debugger_on_signal which turns this on and off, default off.
Add code to drop to ddb when a process gets a fatal signal that usually
suggests kernel bugs (4, 10, 11).  Add a sysctl debug.debugger_on_signal
which turns this on and off, default off.

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