bitcoind behaviour may cause the corruption of spaces.db

[Ximik]

It is hard to reproduce when using the spaces under normal circumstances, but one can reproduce it quite consistently using regtest.

Run bitcoin with some small rpcworkqueue param (for me 5 works the best), run spaces, create a wallet and generate some blocks.

bitcoind -regtest -datadir=bitcoin-regtest/ -rpcworkqueue=5
cargo run --bin spaced -- --chain regtest --bitcoin-rpc-user test --bitcoin-rpc-password test
cargo run --bin space-cli -- --chain regtest createwallet
bitcoin/build/src/bitcoin-cli -regtest -rpcuser=test -rpcpassword=test generatetoaddress 100 bcrt1pmmtxcltp7yq7w0d9sh3gk4xalx43q3tzhrxxyy0lmvul7rhj8hcqm8wc8y

You should have a error as following (generate more blocks if you don't)

ERROR spaced] Protocol sync error: RPC error: Transport: HTTP status server error (503 Service Unavailable) for url (http://127.0.0.1:18443/)

Also sometimes you can also have stack overflow error, but I couldn't reproduce it more than 2 times

thread '<unknown>' has overflowed its stack
fatal runtime error: stack overflow
Aborted

Now repeat it till it breaks

cargo run --bin spaced -- --chain regtest --bitcoin-rpc-user test --bitcoin-rpc-password test
cargo run --bin space-cli -- --chain regtest loadwallet
bitcoin/build/src/bitcoin-cli -regtest -rpcuser=test -rpcpassword=test generatetoaddress 100 bcrt1pmmtxcltp7yq7w0d9sh3gk4xalx43q3tzhrxxyy0lmvul7rhj8hcqm8wc8y

After few repeats you will have a bincode error when trying to load the wallet.

This also sometimes happens with the default rpcworkqueue param and for testnet4 (at least).