Hi! We have a 1004K core with two VPEs with two TCs per VPE. We have a problem that is hard to debug and would like to know if anyone has seen or solved such an issue. A multithreaded application is running. Twoapplication threads are running in one TC each on the same VPE. A piece of code has been paged out. Application thread 1 tries to execute the code and thus gets a page fault. While the page fault is being handled the second application thread enters the same code. For some reason it looks like application thread 2 is allowed to execute even if the page fault handling has not been finished yet. Thread 2 executes the wrong code and typically gets a reserved instruction exception. Any thougts? BR /Mikael