Hello. It seems that during COMMIT PREPARED FinishPreparedTransaction() doesn't hold interrupts around writing to wal and cleaning up ProcArray and GXact entries. At least RemoveTwoPhaseFile (which is called in between) can print a warning with ereport(), which, in turn will check for interrupts and therefore can cancel backend or throw an error before GXact clean-up.
Other similar places like CommitTransaction and PrepareTransaction have such hold interrupts sections. -- Stas Kelvich Postgres Professional: http://www.postgrespro.com The Russian Postgres Company
0001-Add-HOLD_INTERRUPTS-section-into-FinishPreparedTrans.patch
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