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The SPI path checks a foreign key with SELECT ... FOR KEY SHARE, which ExecCheckXactReadOnly() refuses in a read-only transaction unless the referenced table is temporary. The fast path locks the referenced row without that check, so for example a deferred check that fires at COMMIT after SET TRANSACTION READ ONLY succeeded, having locked a row in a read-only transaction, where the SPI path fails with "cannot execute SELECT FOR KEY SHARE in a read-only transaction". Fix the fast path to refuse it the same way so the behavior matches with checks going through SPI. Discussion: https://postgr.es/m/CA+HiwqG79XK1oObdZ2AwT660CeJ6s3Mn4LrFPCme-k4L2rF_ag@mail.gmail.com Backpatch-through: 19