Subject: WIN32 Debug Assertion failure in smartsign dnssec-checkzone
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System popup:
 Debug Assertion Failed!
 Program: ...\named-checkzone.exe
 File: ...\commit.cpp (1)
 Expression: Invalid file descriptor:
  File possibly closed by a different thread

(1) C RunTime (CRT)

smartisign system test, first call to $CHECKZONE
named-checkzone -o - child.parent.nil child.db.signed

Debugger (rt42931 branch), stack is:
 named-checkzone.exe main lien 545
 named-checkzone.exe dump_zone line 764
 libisc.dll dns_zone_dumptostream3 line 10095
 libisc.dll dumptostream line 10082
 libisc.dll dns_master_dumptostream3 line 1777
 libisc.dll flushandsync line 1304
 libisc.dll isc_stdio_sync line 129
 ucrtbased.dll _commit line 36

The WIN32 internal error is 6 (invalid handle)
and is from _commit() (WIN32 version of fsync)
called on the fileno of stdout (cf "-o -" arguments)
as shown by a little program calling
_commit(_fileno(stdout));
it fails and compiled with the Debug it raises
the assertion popup.