tree 15b6eb5ebf107abc74ee75703867b38a36daaf17
parent 435fc451031a6a186284d43a340f6e35be4aa170
author Christopher Ferris <cferris@google.com> 1490213911 -0700
committer Christopher Ferris <cferris@google.com> 1490219705 -0700

Do not access device maps.

It's possible that a device map has memory controlled by a single entry
device driver. Thus, you can deadlock if a process is touching that
device memory and we try to unwind it and also touch that device memory.
Simply skip any attempts to step through, or get function names from
device memory maps.

Bug: 36130325

Test: Ran new unit tests, ran bionic unit tests, ran art ThreadStress.
Change-Id: Ibc62d7ec8106c619ee08968f05e04aea55d7cbfa