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Fix bug that could try to freeze running multixacts.

Commits801c2dc and801c2dc made it possible for vacuum totry to freeze a multixact that is still running. That wasprevented by a check, but raised an error. Repair.Back-patch all the way.Author: Nathan Bossart, Jeremy SchneiderReported-by: Jeremy SchneiderReviewed-by: Jim Nasby, Thomas MunroDiscussion:https://postgr.es/m/DAFB8AFF-2F05-4E33-AD7F-FF8B0F760C17%40amazon.com

1 parente86ece2 commit583d86fCopy full SHA for 583d86f

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src/backend/commands
- vacuum.c

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`‎src/backend/commands/vacuum.c`

Lines changed: 8 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -526,6 +526,7 @@ vacuum_set_xid_limits(Relation rel,`
`526`	`526`	`inteffective_multixact_freeze_max_age;`
`527`	`527`	`TransactionIdlimit;`
`528`	`528`	`TransactionIdsafeLimit;`
	`529`	`+MultiXactIdoldestMxact;`
`529`	`530`	`MultiXactIdmxactLimit;`
`530`	`531`	`MultiXactIdsafeMxactLimit;`
`531`	`532`
`@@ -602,7 +603,8 @@ vacuum_set_xid_limits(Relation rel,`
`602`	`603`	`Assert(mxid_freezemin >=0);`
`603`	`604`
`604`	`605`	`/* compute the cutoff multi, being careful to generate a valid value */`
`605`		`-mxactLimit=GetOldestMultiXactId()-mxid_freezemin;`
	`606`	`+oldestMxact=GetOldestMultiXactId();`
	`607`	`+mxactLimit=oldestMxact-mxid_freezemin;`
`606`	`608`	`if (mxactLimit<FirstMultiXactId)`
`607`	`609`	`mxactLimit=FirstMultiXactId;`
`608`	`610`
`@@ -616,7 +618,11 @@ vacuum_set_xid_limits(Relation rel,`
`616`	`618`	`ereport(WARNING,`
`617`	`619`	`(errmsg("oldest multixact is far in the past"),`
`618`	`620`	`errhint("Close open transactions with multixacts soon to avoid wraparound problems.")));`
`619`		`-mxactLimit=safeMxactLimit;`
	`621`	`+/* Use the safe limit, unless an older mxact is still running */`
	`622`	`+if (MultiXactIdPrecedes(oldestMxact,safeMxactLimit))`
	`623`	`+mxactLimit=oldestMxact;`
	`624`	`+else`
	`625`	`+mxactLimit=safeMxactLimit;`
`620`	`626`	`}`
`621`	`627`
`622`	`628`	`*multiXactCutoff=mxactLimit;`

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Commit583d86f

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`‎src/backend/commands/vacuum.c`

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