We have seen a build failure along the lines of:

 /usr/bin/mv: cannot move '.../build/windows-x64-open-debug/hotspot/variant-server/libjvm/win-exports.def.tmp' to '.../build/windows-x64-open-debug/hotspot/variant-server/libjvm/win-exports.def': No such file or directory

on Windows.

This was found out to be a race between creating the win-export.def file for the normal jvm and the static-libs version of the jvm.