error: unable to write file git/objects/

Try to run the following commands to see if they resolve the problem:

• Stop Bitbucket Server
• Copy the $BITBUCKET_HOME/shared/data/repositories/<repository_id> folder. This is to make sure that a backup of the entire repository is available.

• Run the following commands from the $BITBUCKET_HOME/shared/data/repositories/<repository_id> path:

  git fsck --no-danglinggit repack -adfln --keep-unreachable --depth=20 --window=200

• Start Bitbucket Server

If the steps above don't resolve the problem, the repository may be not recoverable. In this case, the situation can be resolved by restoring a backup generated prior to the corruption.