You're doing me a great service by finding all these cases. I hope you keep it up. I should be releasing 7.0.0 pretty soon. It would be great to fix as many of these as possible. I've coded a fix for this, but I need to do some extra code inspection to make sure my fix is good. It definitely doesn't break any existing tests, and the test suite is very thorough, and it also catches this problem, but I'm not sure it fully addresses the underlying issue, so I'll do more checking before I push to master.
The attached file will crash qpdf. It seems it's running into an endless recursion and thus a stack overflow.
Found with afl.
qpdf-stackoverflow.zip
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