Use memmove instead of memcpy where there is overlap (modunload).
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@ -881,7 +881,7 @@ unload_one_module(const char *name, int warn)
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dlclose(modlist[modindex]->address);
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rb_free(modlist[modindex]->name);
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memcpy(&modlist[modindex], &modlist[modindex + 1],
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memmove(&modlist[modindex], &modlist[modindex + 1],
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sizeof(struct module) * ((num_mods - 1) - modindex));
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if(num_mods != 0)
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