Debugging a Heisenbug. Among other efforts to probe it, making a small change to an unrelated function makes it go away. Years ago, I'd have left it at that... but now I'm not going to sleep until I know what's going on...
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I wonder if your memcpy() was inlined and Valgrind missed it. Detecting overlapping memcpy has been in Valgrind for years.
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When I spotted it, one of my first thoughts was to wonder why valgrind missed it. It's possible that it's related to the fact that the error only happened under -O2.
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