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Limit depth of forced recursion for CLOBBER_CACHE_RECURSIVELY.

It's somewhat surprising that we got away with this before. (Actually,since nobody tests this routinely AFAIK, it might've been broken forawhile. But it's definitely broken in the wake of commitf868a81.)It seems sufficient to limit the forced recursion to a small numberof levels.Back-patch to all supported branches, like the preceding patch.Discussion:https://postgr.es/m/12259.1532117714@sss.pgh.pa.us

1 parentf868a81 commitf510412Copy full SHA for f510412

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src/backend/utils/cache
- inval.c

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+11

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`‎src/backend/utils/cache/inval.c‎`

Lines changed: 11 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -708,7 +708,17 @@ AcceptInvalidationMessages(void)`
`708`	`708`	`}`
`709`	`709`	`}`
`710`	`710`	`#elif defined(CLOBBER_CACHE_RECURSIVELY)`
`711`		`-InvalidateSystemCaches();`
	`711`	`+{`
	`712`	`+staticintrecursion_depth=0;`
	`713`	`+`
	`714`	`+/* Maximum depth is arbitrary depending on your threshold of pain */`
	`715`	`+if (recursion_depth<3)`
	`716`	`+{`
	`717`	`+recursion_depth++;`
	`718`	`+InvalidateSystemCaches();`
	`719`	`+recursion_depth--;`
	`720`	`+}`
	`721`	`+}`
`712`	`722`	`#endif`
`713`	`723`	`}`
`714`	`724`

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Commitf510412

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`‎src/backend/utils/cache/inval.c‎`

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