casaroli commented on PR #20584:
URL: https://github.com/apache/nuttx/pull/20584#issuecomment-6113434966

   The process dump from #20590's run (38162235073) shows where it hangs: under 
`testbuild.sh` only `cmake -B build -DBOARD_CONFIG=nucleo-l152re/nsh -GNinja` 
is left, with no child process. Its last output is `Select WINDOWS_MSYS=y`, and 
the next statement is `nuttx_setconfig()`, an `execute_process(COMMAND 
setconfig ...)` that captures the output. So `setconfig` has finished but CMake 
never gets the end of file on its pipe: the intermittent MSYS2/Cygwin pipe 
hang. A `timeout` around the configure in `testbuild.sh` would turn it into a 
failure that the existing retry ("Build Attempt N of 4") handles.
   


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