Christian Brauner 6952a4f646 selftests: add pid namespace ENOMEM regression test ... We recently regressed (cf. [1] and its corresponding fix in [2]) returning ENOMEM when trying to create a process in a pid namespace whose init process/child subreaper has already died. This has caused confusion at least once before that (cf. [3]). Let's add a simple regression test to catch this in the future. [1]: 49cb2fc42c ("fork: extend clone3() to support setting a PID") [2]: b26ebfe12f ("pid: Fix error return value in some cases") [3]: 35f71bc0a0 ("fork: report pid reservation failure properly") Cc: Corey Minyard <cminyard@mvista.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Adrian Reber <areber@redhat.com> Cc: Dmitry Safonov <0x7f454c46@gmail.com> Cc: Andrei Vagin <avagin@gmail.com> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>		2020-03-25 13:50:34 +01:00
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