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When running under tracer, more explicitly report the status and event mismatches to help with debugging. Additionally add an "immediate kill" test when under tracing to verify that fatal SIGSYS behaves the same under ptrace or seccomp tracing. Cc: Andy Lutomirski <luto@amacapital.net> Cc: Will Drewry <wad@chromium.org> Cc: linux-kselftest@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Link: https://lore.kernel.org/r/20211103163039.2104830-3-keescook@chromium.org