r_watershed_test stderr

E
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ERROR: setUpClass (__main__.TestWatershed)
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Traceback (most recent call last):
  File "raster/r.watershed/testsuite/r_watershed_test.py", line 36, in setUpClass
    cls.use_temp_region()
  File "etc/python/grass/gunittest/case.py", line 119, in use_temp_region
    call_module("g.region", save=name, overwrite=True)
  File "etc/python/grass/gunittest/gmodules.py", line 131, in call_module
    raise CalledModuleError(returncode, module, kwargs, errors)
CalledModuleError: Module run 1 g.region ended with error
Process ended with non-zero return code {'save': 'tmp.TestWatershed', 'stderr': -1, 'overwrite': True, 'stdout': -1}. See the following errors:
ERROR: Unable to make mapset element windows (/grassdata/tests-grassdata/piemonte_utm32_wgs84_grass7/__raster_r_watershed_r_watershed_test/windows): No space left on device


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Ran 0 tests in 0.030s
FAILED (errors=1)