Only one of the three commits for scheduler issues has been backported in 2.6.28.2, and I can still produce this problem with 2.6.28-6-generic. I believe the critical commit for this issue is 6bc912b71b6f33b041cfde93ca3f019cbaa852bc.
Only one of the three commits for scheduler issues has been backported in 2.6.28.2, and I can still produce this problem with 2.6.28-6-generic. I believe the critical commit for this issue is 6bc912b71b6f33b 041cfde93ca3f01 9cbaa852bc.