all RPC nodes with TokensTracker module on testnet stopped syncing

[dusmart]

Describe the bug

We constructed a tx that will emit lots of fake NEP-17 transfer notifications. Plus, its balanceOf consumes lots of CPU resources. After sending that, all seed nodes stopped syncing.

Expected behavior

All nodes go well.

Screenshots

(Optional) Additional context

0xd1854ce611d57a1c613dbbd0172784c338666065f2b1cf20c4e4d7ad23a5d5cc

Tokentacker will filter all notifications and try to update NEP-17 balances for each address which can be exploited.

https://github.com/neo-project/neo-modules/blob/32aacc468ad43600817daabbec834e715017d962/src/TokensTracker/Trackers/NEP-17/Nep17Tracker.cs#L80-L92

https://github.com/neo-project/neo-modules/blob/32aacc468ad43600817daabbec834e715017d962/src/TokensTracker/Trackers/NEP-17/Nep17Tracker.cs#L103-L105

[roman-khimov]

:yawning_face: NeoGo works fine wrt this, our tracker differs a bit.

[roman-khimov]

I think this one was solved quite a while ago and can be closed now.