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From: Kyotaro Horiguchi <[email protected]>
To: [email protected]
Cc: [email protected]
Cc: [email protected]
Subject: Re: [BUG] Panic due to incorrect missingContrecPtr after promotion
Date: Fri, 27 May 2022 10:59:24 +0900 (JST)
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>
	<[email protected]>

At Thu, 26 May 2022 19:57:41 +0000, "Imseih (AWS), Sami" <[email protected]> wrote in 
> We see another occurrence of this bug with the last patch applied in 13.7.
> 
> After a promotion we observe the following in the logs:
...
> We think it's because VerifyOverwriteContrecord was not 
> called which is why we see this behavior. 
> 
> Are there are  other places where missingContrecPtr 
> should be invalidated, such as after a successful promotion?

The only cause known to me for EndOfLog being moved to such location
is missingContrecPtr. But if the next record is not
XLOG_OVERWRITE_CONTRECORD recovery should have stopped there. And if
XLOG_OVERWRITE_CONTRECORD is there, VerifyOverwriteContrecord should
have been called..

Could you inspect WAL files of the environment and see if the first
record of the '7/A8'th segment OVERWRITE_CONTRECORD?  I don't say that
makes some progress on this, but could be the first step.

regards.

-- 
Kyotaro Horiguchi
NTT Open Source Software Center

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