Commit81e36d3

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Invalidate smgr_targblock in smgrrelease().

In rare circumstances involving relfilenode reuse, it might have beenpossible for smgr_targblock to finish up pointing past the end.Oversight inb74e94d. Back-patch to 15.Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi>Discussion:https://postgr.es/m/CA%2BhUKGJ8NTvqLHz6dqbQnt2c8XCki4r2QvXjBQcXpVwxTY_pvA%40mail.gmail.com

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Original file line number	Diff line number	Diff line change
`@@ -296,6 +296,7 @@ smgrrelease(SMgrRelation reln)`
`296`	`296`	`smgrsw[reln->smgr_which].smgr_close(reln,forknum);`
`297`	`297`	`reln->smgr_cached_nblocks[forknum]=InvalidBlockNumber;`
`298`	`298`	`}`
	`299`	`+reln->smgr_targblock=InvalidBlockNumber;`
`299`	`300`	`}`
`300`	`301`
`301`	`302`	`/*`

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