parallel pg_dump causes assertion failure in HEAD

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Robert Haas <robertmhaas(at)gmail(dot)com>, Andres Freund <andres(at)2ndquadrant(dot)com>
Cc: pgsql-hackers(at)postgreSQL(dot)org
Subject: parallel pg_dump causes assertion failure in HEAD
Date: 2014-03-05 17:07:43
Message-ID: 15184.1394039263@sss.pgh.pa.us
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$ pg_dump -F d -j 4 -f foo regression
pg_dump: [archiver (db)] query failed: pg_dump: [parallel archiver] query was: SET TRANSACTION SNAPSHOT '00002130-1'
pg_dump: [archiver (db)] query failed: pg_dump: [archiver (db)] query failed: pg_dump: [archiver (db)] query failed: $

postmaster log shows:

TRAP: FailedAssertion("!(HistoricSnapshotActive())", File: "snapmgr.c", Line: 355)
TRAP: FailedAssertion("!(HistoricSnapshotActive())", File: "snapmgr.c", Line: 355)
TRAP: FailedAssertion("!(HistoricSnapshotActive())", File: "snapmgr.c", Line: 355)
TRAP: FailedAssertion("!(HistoricSnapshotActive())", File: "snapmgr.c", Line: 355)
LOG: server process (PID 15069) was terminated by signal 6: Aborted
DETAIL: Failed process was running: SET TRANSACTION SNAPSHOT '00002130-1'
LOG: terminating any other active server processes

That Assert appears to have been introduced by commit b89e1510.

regards, tom lane

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