testnet/3: All power in the net is gone (testground)

[jimpick]

Describe the bug
I'm running a 3 node localnet using testground.

I tried to pledge a few sectors, but they failed, ending up in the SealCommitFailed state.

Then at height 540, all the nodes stopped updating.

On the genesis node, I noticed this in the logs for the lotus node:

2020-03-30T23:06:43.015Z	WARN	rpc	jsonrpc/handler.go:225	error in RPC call to 'Filecoin.SyncSubmitBlock': sync to submitted block failed:
    github.com/filecoin-project/lotus/node/impl/full.(*SyncAPI).SyncSubmitBlock
        /lotus/node/impl/full/sync.go:71
  - failed to put synced tipset to chainstore:
    github.com/filecoin-project/lotus/chain.(*Syncer).Sync
        /lotus/chain/sync.go:428
  - MaybeTakeHeavierTipSet failed in PutTipSet:
    github.com/filecoin-project/lotus/chain/store.(*ChainStore).PutTipSet
        /lotus/chain/store/store.go:243
  - All power in the net is gone. You network might be disconnected, or the net is dead!:
    github.com/filecoin-project/lotus/chain/store.(*ChainStore).Weight
        /lotus/chain/store/weight.go:55

I'll dig through the logs to see if I can find any more clues. I might start the localnet again from scratch to see if I can reproduce (only takes me a few minutes).

Version (run lotus --version):

lotus version 0.3.0+gitf2d90b83.dirty

[jimpick]

I forgot to mention this is a make debug build with 2048 byte sectors.

[jimpick]

I added some extra logging, and voila:

computing seal proof failed 2: %!w(*errors.fundamental=&{No cached parameters found for stacked-proof-of-replication-PoseidonHasher-Sha256Hasher-fe437922fe766f61b112750506d6be0e4ad5daa85ff9ce96549d99253ba61cbe 0xc0004be480})

Looks like this is peculiar to my setup with testground. I'll close this.