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Fix race condition when sharing tuple descriptors.

Parallel query processes that called BlessTupleDesc() for identicaltuple descriptors at the same moment could crash. There was code tohandle that rare case, but it dereferenced a bogus DSA pointer. Repair.Back-patch to 11, where commit cc5f8136 added support for sharing tupledescriptors in parallel queries.Reported-by: Eric Thinnes <e.thinnes@gmx.de>Discussion:https://postgr.es/m/99aaa2eb-e194-bf07-c29a-1a76b4f2bcf9%40gmx.de

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src/backend/utils/cache
- typcache.c

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`‎src/backend/utils/cache/typcache.c`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -2707,7 +2707,7 @@ find_or_make_matching_shared_tupledesc(TupleDesc tupdesc)`
`2707`	`2707`	`Assert(record_table_entry->key.shared);`
`2708`	`2708`	`result= (TupleDesc)`
`2709`	`2709`	`dsa_get_address(CurrentSession->area,`
`2710`		`-record_table_entry->key.shared);`
	`2710`	`+record_table_entry->key.u.shared_tupdesc);`
`2711`	`2711`	`Assert(result->tdrefcount==-1);`
`2712`	`2712`
`2713`	`2713`	`returnresult;`

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Commitd41fda6

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`‎src/backend/utils/cache/typcache.c`

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