[Kusama] Upgrade Validator node from 0.8.8 to 0.8.11 meets Encountered consensus error

[jasl]

• Ubuntu 18.04 latest, 2 Core 8G memory
• Download Linux binary from GitHub releases page
• Kusama chain
• Validator role

Start command:

#!/bin/bash

WORK_PATH=$(dirname $(readlink -f "$0"))
NODE_NAME="my-kusama-validator-1"
CHAIN_NAME="kusama"
RESERVED_NODES="/ip4/10.172.0.13/tcp/30333/p2p/12D3KooWCqsof9wiHJgc62nKz2a8gaP9PSyeKMi8jEcgLB93r5b4 /ip4/10.178.0.3/tcp/30333/p2p/12D3KooWCyh5bS5AVroXvuUJdnByDeGv3akpPTVB6GMNWuiVDBwL"

$WORK_PATH/polkadot \
  --chain $CHAIN_NAME \
  --base-path $WORK_PATH \
  --database paritydb \
  --wasm-execution Compiled \
  --name $NODE_NAME \
  --reserved-only \
  --reserved-nodes $RESERVED_NODES \
  --validator \
  "$@"

---

I'm trying upgrade our Validator node from 0.8.8 to 0.8.11 by

• stop polkadot
• replace old binary with 0.8.11
• start polkadot

After upgrade, I found in output, every blocks has Encountered consensus error: CannotSign([222, 116, 165, 60, 193, 167, 108, 252, 157, 96, 136, 134, 50, 17, 203, 98, 195, 74, 135, 1, 188, 51, 69, 201, 83, 51, 64, 41, 149, 222, 218, 102], "An unknown keystore error occurred: No such file or directory (os error 2)") log

e.g.

2020-06-23 00:09:24 Starting parachain attestation session on top of parent 0xcfdc1662ff14dfdb70aa69fc6e33743193061a26b3a54c7c1bb0f96505abc86e. Local parachain duty is Some(LocalDuty { validation: Relay, index: 173 })
2020-06-23 00:09:25 ✨ Imported #2864801 (0xff5d…9219)
2020-06-23 00:09:25 ✨ Imported #2864801 (0xcdef…6ad0)
2020-06-23 00:09:25 💤 Idle (2 peers), best: #2864801 (0xcfdc…c86e), finalized #2864798 (0x3e45…b17c), ⬇ 84.4kiB/s ⬆ 79.3kiB/s
2020-06-23 00:09:30 🙌 Starting consensus session on top of parent 0xcfdc1662ff14dfdb70aa69fc6e33743193061a26b3a54c7c1bb0f96505abc86e
2020-06-23 00:09:30 🎁 Prepared block for proposing at 2864802 [hash: 0x3ee2ca8555d3e023316ead3878c5c86de53d332e1271b8e2f7e207f55e0732ed; parent_hash: 0xcfdc…c86e; extrinsics (2): [0x4d4e…3728, 0xcf52…810d]]
2020-06-23 00:09:30 Encountered consensus error: CannotSign([222, 116, 165, 60, 193, 167, 108, 252, 157, 96, 136, 134, 50, 17, 203, 98, 195, 74, 135, 1, 188, 51, 69, 201, 83, 51, 64, 41, 149, 222, 218, 102], "An unknown keystore error occurred: No such file or directory (os error 2)")

I think this is not good, so I quickly downgrade to 0.8.10, the output looks normal, I haven't try 0.8.10 to 0.8.11 yet.

I've some question:

• Is this error a bug? or my mistake when upgrading polkadot
• I'm running my validator in this situation for minutes, will my validator getting slash?

[bkchr]

The node works as expected, but prints this error per block.

TDLR: We have fixed it on master and you should not use 0.8.11 at the moment. Sorry!