BTW, I just managed to reproduce the hang, after a whole afternoon of trying ... only it was with a non-debug build. Sigh. Anyway, it seems my HP machine has a significantly higher probability of showing the problem than my Linux machine --- I have been unable to see the problem in thirty or forty "make checks" on that one.
Let me know if there's any test I could run to confirm your theory, assuming I can make it happen again after I finish rebuilding.
You could add another assertion that checks that the CDB found is actually pointing to the buffer that is being invalidated.
Looking at the bufmgr.c code for FlushRelationBuffers() ... it does exactly what I described ... leaving the relnode and buffernum for an invalidated buffer just where they are.
Jan
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