Revert "Fix stack-walking race"

This reverts commit 721e40283793649b4750c05da4fe972bd372f7f9.

Reason for revert: Wanted more discussion.

Test: none

Bug: 72608560
Bug: 29259363
Bug: 148166031
Change-Id: Id0fb201018a0d0bdca11d51ec156a41d6d7fe4ae
12 files changed