Occasionally cargo build freezes near the last step (26/27 for me) and i ctrl-c. Then running cargo build again I get this error:

“Blocking waiting for file lock on build directory”

Searching the internets people claim this can be fixable by clearing out the package-cache (“rm -rf ~/.cargo/.package-cache”), however this doesn’t work for me. What DOES work is cargo clean then rebuild. This takes WAY too long. A better way is to just pkill the running process (ps aux | grep cargo, or pkill cargo).