Fix non-killable thread 'stuck' in filesort.
Fix non-killable thread 'stuck' in filesort.

Change-Id: I14ac9e5c0adced86d3a184649ca99fd9aef266e7

odolhado/google-mysql,laizi77/google-mysql,laizi77/google-mysql,raumfish/google-mysql,odolhado/google-mysql,google/mysql,fengshao0907/google-mysql,cong8341/google-mysql,raumfish/google-mysql,odolhado/google-mysql,fengshao0907/google-mysql,odolhado/google-mysql,google/mysql,raumfish/google-mysql,cong8341/google-mysql,cong8341/google-mysql,google/mysql,raumfish/google-mysql,fengshao0907/google-mysql,raumfish/google-mysql,fengshao0907/google-mysql,cong8341/google-mysql,google/mysql,laizi77/google-mysql,raumfish/google-mysql,odolhado/google-mysql,fengshao0907/google-mysql,odolhado/google-mysql,odolhado/google-mysql,cong8341/google-mysql,cong8341/google-mysql,google/mysql,laizi77/google-mysql,cong8341/google-mysql,fengshao0907/google-mysql,google/mysql,raumfish/google-mysql,google/mysql,cong8341/google-mysql,fengshao0907/google-mysql,laizi77/google-mysql,raumfish/google-mysql,odolhado/google-mysql,laizi77/google-mysql,fengshao0907/google-mysql,laizi77/google-mysql,laizi77/google-mysql,google/mysql