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A target library "lib42.so" has DT_DEBUG entry in the .dynamic section.

After dlopen("lib42.so", RTLD_LOCAL | RTLD_NOW) succeded, r_debug->d_un.d_ptr is equal to zero. Why?

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You should probably check the dynamic linker source code to be sure but I suspect that DT_DEBUG is only filled for the main binary and not the additional modules.

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