Finally found the crazy APT memory corruption bug.

diff --git a/apt b/apt
index baec76f5f0f9fcbd71f6e2afaa7fc85543bd624c..88ac08f98958386bb268c3c756f56a1367a7a671 160000 (submodule)
--- a/apt
+++ b/apt
@@ -1 +1 @@
-Subproject commit baec76f5f0f9fcbd71f6e2afaa7fc85543bd624c
+Subproject commit 88ac08f98958386bb268c3c756f56a1367a7a671