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Could not generate historical state, pre state can't be nil #5611

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terencechain opened this issue Apr 24, 2020 · 3 comments · Fixed by #5613
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Could not generate historical state, pre state can't be nil #5611

terencechain opened this issue Apr 24, 2020 · 3 comments · Fixed by #5613
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🐞 Bug Report

Description

Reported by Peter from Bitfly:

time="2020-04-24 15:30:08" level=error msg="could not regenerate historical states, please retry: pre state can't be nil" prefix=main
@terencechain terencechain self-assigned this Apr 24, 2020
@terencechain terencechain added the Bug Something isn't working label Apr 24, 2020
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Looking at this now

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Reproduced around slot 43520, looks like one block's parent was > 64 slots old. Retry with extending the cache size from 2 epochs to 3 epochs

[2020-04-24 11:51:45]  INFO Saved historical state archivedStateSlot=42496 currentArchivedIndex/totalArchivedIndices=165/189
[2020-04-24 11:51:52]  INFO Saved historical state archivedStateSlot=43008 currentArchivedIndex/totalArchivedIndices=167/189
[2020-04-24 11:51:58]  INFO Saved historical state archivedStateSlot=43520 currentArchivedIndex/totalArchivedIndices=169/189
[2020-04-24 11:52:02] ERROR main: could not regenerate historical states, please retry: pre state can't be nil

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Found the problem. The block at slot 43772 built on top of pre state of slot 43693. Will increase the cache size to 80. Verified it solved the problem. Will open a PR

@terencechain terencechain mentioned this issue Apr 24, 2020
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Increase regen historical state cache size prysmaticlabs/prysm
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