Developers halted the chain before liquidity pools were fully drained, but estimated that about $5 million was lost. They wrote that they were working on recovery plan; perhaps they will also encourage their community to report bugs privately, rather than via public Reddit post.
The Osmosis chain was halted on June 8 after users discovered a bug where people could deposit money into Osmosis pools and receive 3x the amount when they withdrew. The bug was first reported in a public Reddit post where a user posted, "Bug on Osmosis There is a serious problem with osmosis. If you add liquidity to a pool and then remove it, it grows by 50%! How can we fix this!?!? Pools empty by morning!"