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Fix mishandling of background worker PGPROCs in EXEC_BACKEND builds.

InitProcess() relies on IsBackgroundWorker to decide whether the PGPROCfor a new backend should be taken from ProcGlobal's freeProcs or frombgworkerFreeProcs. In EXEC_BACKEND builds, InitProcess() is calledsooner than in non-EXEC_BACKEND builds, and IsBackgroundWorker wasn'tgetting initialized soon enough.Report by Noah Misch. Diagnosis and fix by me.

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src/backend/postmaster
- postmaster.c

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`‎src/backend/postmaster/postmaster.c‎`

Lines changed: 3 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -4668,6 +4668,9 @@ SubPostmasterMain(int argc, char *argv[])`
`4668`	`4668`	`{`
`4669`	`4669`	`intshmem_slot;`
`4670`	`4670`
	`4671`	`+/* do this as early as possible; in particular, before InitProcess() */`
	`4672`	`+IsBackgroundWorker = true;`
	`4673`	`+`
`4671`	`4674`	`/* Close the postmaster's sockets */`
`4672`	`4675`	`ClosePostmasterPorts(false);`
`4673`	`4676`

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Commite280c63

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`‎src/backend/postmaster/postmaster.c‎`

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