R4R: Fix signing info handling bugs & faulty slashing #2480

cwgoes · 2018-10-11T20:50:09Z

Closes #2372
Closes #1867

Addressing both issues at once is more efficient.

Signing info is now initialized when a validator is bonded, using the existing validator bond hook
Signing info array & counter are now reset when a validator is jailed, giving them a chance to sign blocks again afterwards without being immediately slashed

Nothing is reset if a validator leaves the bonded set as a result of any reason other than being slashed for downtime, so it shouldn't be possible to reset the counter without also incurring the penalties of being slashed & jailed.

We must iterate over SignedBlocksWindow store keys and delete them when a validator is slashed for downtime, but that's probably a relatively rare occurrence and incurs a real cost, so I don't think spam is too much of a concern.

Standard checklist:

Linked to github-issue with discussion and accepted design OR link to spec that describes this work.
Wrote tests
Updated relevant documentation (docs/)
Added entries in PENDING.md with issue #
rereviewed Files changed in the github PR explorer

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Added appropriate labels to PR (ex. wip, ready-for-review, docs)
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codecov · 2018-10-11T21:08:08Z

Codecov Report

❗ No coverage uploaded for pull request base (develop@2803830). Click here to learn what that means.
The diff coverage is 83.67%.

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cwgoes · 2018-10-11T22:17:45Z

OK, this should basically do what we want, just need to make sure the jail duration is greater than the signed blocks window. Needs testcases & spec update.

cwgoes · 2018-10-12T19:23:48Z

cc @SLAMPER @HaoyangLiu want to review?

hendrikhofstadt

utACK however please note minimal change requests.

x/slashing/keeper_test.go

hendrikhofstadt · 2018-10-13T11:23:01Z

x/slashing/keeper.go

 	}
 	minHeight := signInfo.StartHeight + k.SignedBlocksWindow(ctx)
-	if height > minHeight && signInfo.SignedBlocksCounter < k.MinSignedPerWindow(ctx) {
+	maxMissed := k.SignedBlocksWindow(ctx) - k.MinSignedPerWindow(ctx)
+	if height > minHeight && signInfo.MissedBlocksCounter > maxMissed {


Do we really want to keep this dependent on the StartHeight ?

That way a validator could unbond every SignedBlocksWindow-2 blocks and then rebond to avoid slashing since the StartHeight is reset now.

Ah yes, of course, in the case when they aren't jailed at all.

I think I'll try the other strategy, deleting the array shouldn't be too expensive.

Now we never reset the start height, and instead reset the counter & clear the array when the validator is slashed for downtime.

x/slashing/keeper.go

cwgoes · 2018-10-15T21:15:03Z

Ready for review again.

rigelrozanski

looks good! few lil comments

x/slashing/keeper.go

x/slashing/keeper_test.go

cwgoes · 2018-10-15T22:19:45Z

Thanks @rigelrozanski - do you want to review this @jaekwon?

Create signing info struct on validator bond hook

f6e92df

cwgoes added C:x/staking C:x/slashing wip labels Oct 11, 2018

cwgoes requested review from ebuchman and rigelrozanski as code owners October 11, 2018 20:50

cwgoes mentioned this pull request Oct 11, 2018

Failed to slash a validator for double sign at the first block #2372

Closed

4 tasks

Update PENDING.md

b55f29f

cwgoes changed the title ~~WIP: Fix signing info handling bugs~~ WIP: Fix signing info handling bugs & faulty slashing Oct 11, 2018

cwgoes added 2 commits October 12, 2018 00:04

Count missed blocks instead of signed blocks

5fd7297

Update block height on validator bonding

8c2c9db

Update spec

6e4a8d9

cwgoes requested a review from zramsay as a code owner October 11, 2018 23:05

cwgoes added 3 commits October 12, 2018 19:57

Merge branch 'develop' into cwgoes/fix-signing-info-bugs

69b7519

Greater than to greater than or equal to

a83535a

Clarify testcase

bdfb10f

cwgoes changed the title ~~WIP: Fix signing info handling bugs & faulty slashing~~ R4R: Fix signing info handling bugs & faulty slashing Oct 12, 2018

Back to greater than

1ff2e86

cwgoes added ready-for-review and removed wip labels Oct 12, 2018

hendrikhofstadt suggested changes Oct 13, 2018

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cwgoes added wip and removed ready-for-review labels Oct 14, 2018

cwgoes changed the title ~~R4R: Fix signing info handling bugs & faulty slashing~~ WIP: Fix signing info handling bugs & faulty slashing Oct 14, 2018

abelliumnt reviewed Oct 14, 2018

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cwgoes added 5 commits October 15, 2018 21:04

Merge branch 'develop' into cwgoes/fix-signing-info-bugs

2c4d9a0

Test correct JailedUntil

fa372d3

Update function names to clarify semantics

6e0f3d6

Further clarification of nomenclature

096a8bb

Clear array when validator is jailed

9ec35a0

cwgoes changed the title ~~WIP: Fix signing info handling bugs & faulty slashing~~ R4R: Fix signing info handling bugs & faulty slashing Oct 15, 2018

Fix testcases

ec53a14

cwgoes mentioned this pull request Oct 15, 2018

Faulty slashing when ex-validator is reintroduced into the validator set #1867

Closed

4 tasks

cwgoes added ready-for-review and removed wip labels Oct 15, 2018

cwgoes added 4 commits October 15, 2018 23:01

Bugfix; update slashing spec

83f7a4c

Fix linter warning

e3fa982

Fix typo

7bf8a41

iter.Close()

c0c5e29

rigelrozanski reviewed Oct 15, 2018

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cwgoes mentioned this pull request Oct 15, 2018

Separate slashing tests into smaller distinct cases with more explicit state setup #2499

Closed

Address @rigelrozanski comments

f987750

rigelrozanski approved these changes Oct 15, 2018

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abelliumnt approved these changes Oct 16, 2018

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hendrikhofstadt approved these changes Oct 16, 2018

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cwgoes added 3 commits October 16, 2018 19:23

Merge branch 'develop' into cwgoes/fix-signing-info-bugs

3f59cf1

Alphanumeric parameter keys

7d46b8b

Fix merge rename

0d11043

cwgoes merged commit 55f4f61 into develop Oct 16, 2018

cwgoes deleted the cwgoes/fix-signing-info-bugs branch October 16, 2018 18:21

sunnya97 mentioned this pull request Oct 24, 2018

Mystery validator unbond/bond #1865

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4 tasks

rigelrozanski mentioned this pull request Nov 30, 2018

WIP: Initial window downtime slash fix #1792

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R4R: Fix signing info handling bugs & faulty slashing #2480

R4R: Fix signing info handling bugs & faulty slashing #2480

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R4R: Fix signing info handling bugs & faulty slashing #2480

R4R: Fix signing info handling bugs & faulty slashing #2480

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