`keybase git gc` on large repo gives `ERROR EOF`

I'm trying to run keybase git gc on a rather large repo (lots of small commits). The process runs for a while, then dies with ERROR EOF. I also noticed it was using a lot of memory while it was running, and I'm pretty sure I saw it get up to 70% memory usage at one point. I've gotten the error at least twice, including immediately after restarting Keybase.

Any idea what would cause this? Is my repo too big, or do I need to run gc more often?

I tried to submit a log with keybase log send right after, but it gave me a network error. Assuming that will be helpful, I'll try again after the next time I get the error, and maybe restart Keybase if I get the error sending the log again. If it still doesn't work, should I zip up the logs to send them directly?

Reproduce keybase git gc on a large repository and capture the logs; the report also mentions keybase log send as the submission path, though it failed with a network error. Done means identifying the cause of ERROR EOF and high memory use, then documenting a confirmed fix or workaround.