[strace/strace] Strace should prevent a process under tracing to attach to the strace itself (#178)

[Dmitry V. Levin]

Looks like strace is not the right place to break this loop.
Better workarounds are available, e.g. one can enable restricted ptrace by setting /proc/sys/kernel/yama to 1,
or clear dumpable bit of the strace that shouldn't be ptraced.

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