[issue38502] regrtest: use process groups

[David Bolen]

David Bolen <db3l.net at gmail.com> added the comment:

I can recreate this manually by running regrtest.py against test_pty.  Crashes with any "-j#" option, but fine when run sequentially.  Removing the process group change avoids the crash.

With the process group change in place, the trigger point appears to be the final "os.close(master_fd)" in PtyTest.test_basic.  Commenting that out avoids the crash.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38502>
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