double sign may happen after restart

[buddh0]

System information

worker.recentMinedBlocks is empty when node start, and not jounalized
so may miss some double sign checking

Geth version: geth version
OS & Version: Windows/Linux/OSX
Commit hash : (if develop)

Expected behaviour

Actual behaviour

Steps to reproduce the behaviour

Backtrace

[backtrace]

When submitting logs: please submit them as text and not screenshots.

[buddh0]

low prority

[buddh0]

only happens in the following scene:

1. validator mined a block and write the block into db
2. before writing the block as the head block, validator is force killed
3. immediately, restart the validator, it will try to mine another block at the same height.

for validators, force kill should be avoid.
so ,the probability of this scenario happening is extremely low