It now appears that almost certainly the problem was caused by the lastpass 1.66.11 extension of chrome. I downgraded to 1.66.10 and now sudo lsof -c X | wc appears to be stable (before it kept growing).
It now appears that almost certainly the problem was caused by the lastpass 1.66.11 extension of chrome. I downgraded to 1.66.10 and now sudo lsof -c X | wc appears to be stable (before it kept growing).