Backed out 7 changesets (bug 905999, bug 909989) for Linux tp crashes on a CLOSED TREE.

Backed out changeset 3bb7a1c950a3 (bug 905999)
Backed out changeset a95e00dbefea (bug 905999)
Backed out changeset f66ece725f98 (bug 905999)
Backed out changeset f7779522f6f6 (bug 905999)
Backed out changeset 91b14e27101a (bug 909989)
Backed out changeset f1842e91034d (bug 909989)
Backed out changeset ccc30b7c2277 (bug 909989)