K 10 svn:author V 7 davidxu K 8 svn:date V 27 2013-04-18T05:12:11.371447Z K 7 svn:log V 204 Revert revision 249323, the PR/177624 is confusing, that bug is caused by using buggy getcontext/setcontext on same stack, while swapcontext normally works on different stack, there is no such a problem. END