git: kernel - Fix excessive call stack depth on stuck interrupt

[Matthew Dillon]

commit 203592a0390a38f65c5ca941c389ca470d73eeeb
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Fri May 19 10:51:55 2017 -0700

    kernel - Fix excessive call stack depth on stuck interrupt
    
    * Fix an issue where a stuck level interrupt can result in an excessively
      deep call-stack and possible panic.
    
    * Fixed by disallow thread preemption when curthread->td_nest_count
      is >= 2.  The critical section count test is not sufficient for the
      fast-interrupt unpend -> preemption case.

Summary of changes:
 sys/kern/kern_intr.c   | 10 ++--------
 sys/kern/lwkt_thread.c | 17 +++++++++++++----
 2 files changed, 15 insertions(+), 12 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/203592a0390a38f65c5ca941c389ca470d73eeeb


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