[Bug 193269] panic: kdb_switch: did not reenter debugger (from sysctl debug.kdb.enter=1 w/ i915kms)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193269

--- Comment #3 from commit-hook at freebsd.org ---
A commit references this bug:

Author: dumbbell
Date: Mon Sep  8 08:44:50 UTC 2014
New revision: 271253
URL: http://svnweb.freebsd.org/changeset/base/271253

Log:
  pause_sbt(): Take the cold path (ie. use DELAY()) if KDB is active

  This fixes a panic in the i915 driver when one uses debug.kdb.enter=1
  under vt(4).

  PR:        193269
  Reported by:    emaste@
  Submitted by:    avg@
  MFC after:    3 days

Changes:
  head/sys/kern/kern_synch.c

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