Mark Johnston 09a15aa38d Import a missing piece of commit b8fac8e162eda7e98d from illumos-gate.
This adds an upper bound, dtrace_ustackdepth_max, to the number of frames
traversed when computing the userland stack depth. Some programs - notably
firefox - are otherwise able to trigger an infinite loop in
dtrace_getustack_common(), causing a panic.

MFC after:	1 week
2015-03-30 03:55:51 +00:00
..
2014-11-10 08:20:21 +00:00