[Bug tdep/34195] New: Windows tests report "No unwaited-for children left."

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=34195

            Bug ID: 34195
           Summary: Windows tests report "No unwaited-for children left."
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tdep
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at sourceware dot org
  Target Milestone: ---

Created attachment 16742
  --> https://sourceware.org/bugzilla/attachment.cgi?id=16742&action=edit
log file

Recent changes in windows-nat.c caused some test failures in
the internal AdaCore test suite.

These seem to occur on x86 and x86-64, Windows 2019 (though it's
possible other versions too, I don't know).  In my experimenting
I can only reproduce the problems when running with some load on
the machine -- I have not been able to make a single test fail in
isolation.

I will attach a log showing the failure.
I created this log by doing this in test framework when gdb
is started:

        self.test("set logging file mylogging.log")
        self.test("set logging debugredirect on")
        self.test("set debug infrun 1")
        self.test("set debugevents 1")
        self.test("set logging enabled on")

It's reasonably easy to redo the experiment with different logging
options if that's necessary.

The test case in question is extremely simple.  In it, gdb
is used to run this "null" Ada program:

procedure Null_Program is
begin
   null;
end Null_Program;

No breakpoints are set, the program is just "run" and expected
to terminate normally.

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