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Previously we only copied the function attributes. That caused problems at least on s390x: Because we didn't copy the 'zeroext' attribute for ExecAggTransReparent()'s *IsNull parameters, expressions invoking it didn't ensure that the upper bytes of the registers were zeroed. In the - relatively rare - cases where not, ExecAggTransReparent() wrongly ended up in the newValueIsNull branch due to the register not being zero. Subsequently causing a crash. It's quite possible that this would cause problems on other platforms, and in other places than just ExecAggTransReparent() on s390x. Thanks to Christoph (and the Debian project) for providing me with access to a s390x machine, allowing me to debug this. Reported-By: Christoph Berg Author: Andres Freund Discussion: https://postgr.es/m/20201015083246.kie5726xerdt3ael@alap3.anarazel.de Backpatch: 11-, where JIT was added |
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