New issue 1859: windows translated -A module/thread/test segfaults pypy https://bitbucket.org/pypy/pypy/issue/1859/windows-translated-a-module-threa... mattip: this seems to be a shadowstack issue, since I've pretty much ruled everything else out :) * running pypy.exe --jit off pypy/test_all.py pypy/module/thread/test/test_thread.py crashes pypy.exe, so it is not a jit issue * The crash happens in AppTestThread.setupclass * printing i in the ```for i in range(1000)``` loop reliably crashes with i==957 * compiling with -Od or running the code outside pytest.py does not crash, maybe connected to the testing infrastructure adding another 100 or so calls to begin_thread * adding printf() in thread_nt.c indicates that the crash is not there, and that ``begin_thread`` is not returning -1 * running inside a debugger stops in interpreter/pyopcode ``handle_operation_error`` with an invalid ``self`` (frame) Responsible: mattip