15818468f8
Child processes are left hanging on abort() as these child procs
freeze(), so test suites hang as well when test-namespace fails,
and processes are leaked.
From the docs:
The parent-death signal setting is also cleared upon changes to any of
the following thread credentials: effective user ID, effective group ID,
filesystem user ID, or filesystem group ID.
Set the deathsig again after changing id.
Follow-up for 2ade821859
System and Service Manager
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