tree 832d3ab764da9a63d4e22001f18045fa13078dd5
parent 385ea22741ed5bad794fb6b1dff2b46481f241c4
author Josh Gao <jmgao@google.com> 1503351077 -0700
committer Josh Gao <jmgao@google.com> 1513375872 -0800

crash_dump: fork a copy of the target's address space.

Reduce the amount of time that a process remains paused by pausing its
threads, fetching their registers, and then performing unwinding on a
copy of its address space. This also works around a kernel change
that's in 4.9 that prevents ptrace from reading memory of processes
that we don't have immediate permissions to ptrace (even if we
previously ptraced them).

Bug: http://b/62112103
Bug: http://b/63989615
Test: treehugger
Change-Id: I7b9cc5dd8f54a354bc61f1bda0d2b7a8a55733c4