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2509bdc8a4
When listns() is not implemented the iterator child detects ENOSYS and exits cleanly with status PIDFD_SKIP before the parent has a chance to signal it. The parent sends SIGKILL (which is a harmless no-op at that point) and then calls waitpid(), obtaining a normal-exit status. The subsequent ASSERT_TRUE(WIFSIGNALED(status)) therefore fails, causing the three EFAULT-focused tests to report FAIL rather than SKIP on kernels that do not yet carry listns() support. After collecting the iterator's exit status, check whether it exited with PIDFD_SKIP and issue a SKIP verdict in that case, consistent with the behaviour of every other listns test that already handles ENOSYS correctly. Signed-off-by: Ricardo B. Marlière <rbm@suse.com> Link: https://patch.msgid.link/20260407-selftests-namespaces_fixes-v1-3-59109909d88b@suse.com Signed-off-by: Christian Brauner <brauner@kernel.org>