K 10
svn:author
V 5
markj
K 8
svn:date
V 27
2016-07-05T17:59:04.326164Z
K 7
svn:log
V 506
Ensure that spinlock sections are balanced even after a panic.

vpanic() uses spinlock_enter() to disable interrupts before dumping core.
However, when the scheduler is stopped and INVARIANTS is not configured,
thread_lock() does not acquire a spinlock section, while thread_unlock()
releases one. This can result in interrupts staying enabled while the
kernel dumps core, complicating post-mortem analysis of the crash.

Approved by:	re (gjb)
MFC after:	1 week
Sponsored by:	EMC / Isilon Storage Division

END