OK, I have bisected this problem to the following change:
commit 8dc85d547285668e509f86c177bcd4ea055bcaaf
Author: Peter Zijlstra <a.p.zijls...@chello.nl>
Date: Thu Sep 2 16:50:03 2010 +0200
perf: Multiple task contexts
Provide the infrastructure for multiple task contexts.
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