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Current BourneShellScript specifically declines to copy stdout/stderr from the wrapper process to the build log, since doing so would consume a Thread, but this also makes diagnosis of this class of error harder. Should at a minimum allow the diagnosis to be enabled with a system property. Maybe it is possible to allocate a thread which stops listening after one second. Or maybe up to (say) five concurrent tasks in the system would get this diagnosis applied but subsequent ones would not, so that people experimenting with flow definitions would get the benefit of diagnosis but there would be little performance hit in busy production systems.