K 10
svn:author
V 6
alfred
K 8
svn:date
V 27
2012-12-07T08:25:08.608727Z
K 7
svn:log
V 720
Allow KASSERT to log instead of panic.

This is to allow debug images to be used without taking down the
system when non-fatal asserts are hit.

The following sysctls are added:

debug.kassert.warn_only: 1 = log, 0 = panic

debug.kassert.do_ktr: set to a ktr mask for logging via KTR

debug.kassert.do_log: 1 = log, 0 = quiet

debug.kassert.warnings: stats, number of kasserts hit

debug.kassert.log_panic_at:
  number of kasserts before we actually panic, 0 = never

debug.kassert.log_pps_limit: pps limit for log messages

debug.kassert.log_mute_at: stop warning after N kasserts, 0 = never stop

debug.kassert.kassert: set this sysctl to trigger a kassert

Discussed with: scottl, gnn, marcel
Sponsored by: iXsystems

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