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Commit 81e36d3

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Invalidate smgr_targblock in smgrrelease().
In rare circumstances involving relfilenode reuse, it might have been possible for smgr_targblock to finish up pointing past the end. Oversight in b74e94d. 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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src/backend/storage/smgr/smgr.c

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Original file line numberDiff line numberDiff line change
@@ -296,6 +296,7 @@ smgrrelease(SMgrRelation reln)
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smgrsw[reln->smgr_which].smgr_close(reln, forknum);
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reln->smgr_cached_nblocks[forknum] = InvalidBlockNumber;
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}
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reln->smgr_targblock = InvalidBlockNumber;
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}
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/*

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