K 10
svn:author
V 6
mhorne
K 8
svn:date
V 27
2020-11-19T18:03:40.872691Z
K 7
svn:log
V 639
Add an option for entering KDB on recursive panics

There are many cases where one would choose avoid entering the debugger
on a normal panic, opting instead to reboot and possibly save a kernel
dump. However, recursive kernel panics are an unusual case that might
warrant attention from a human, so provide a secondary tunable,
debug.debugger_on_recursive_panic, to allow entering the debugger only
when this occurs.

For for simplicity in maintaining existing behaviour, the tunable
defaults to zero.

Reviewed by:	cem, markj
Sponsored by:	NetApp, Inc.
Sponsored by:	Klara, Inc.
Differential Revision:	https://reviews.freebsd.org/D27271

END