# Kubo v0.21.0-rc1 is out! **URL:** \ **Category:** News\ **Tags:** go-ipfs, kubo\ **Created:** [June 12, 2023, 4:22pm UTC](https://discuss.ipfs.tech/t/kubo-v0-21-0-rc1-is-out/16557 "2023-06-12T16:22:52Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![hacdias](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ipfs.tech/hacdias/32/8255_2.png) [@hacdias](https://discuss.ipfs.tech/u/hacdias)\ **Post date:** [June 12, 2023, 4:22pm UTC](https://discuss.ipfs.tech/t/kubo-v0-21-0-rc1-is-out/16557/1 "2023-06-12T16:22:52Z")
## Kubo v0.21.0-rc1 is out! See: - Code: [Release v0.21.0-rc1 · ipfs/kubo · GitHub](https://github.com/ipfs/kubo/releases/tag/v0.21.0-rc1) - Binaries: [/ipns/dist.ipfs.tech/kubo/v0.21.0-rc1/](https://dist.ipfs.tech/kubo/v0.21.0-rc1/) - Docker: `docker pull ipfs/kubo:v0.21.0-rc1` - Release Notes: [kubo/docs/changelogs/v0.21.md at release-v0.21.0 · ipfs/kubo · GitHub](https://github.com/ipfs/kubo/blob/release-v0.21.0/docs/changelogs/v0.21.md) ---
**Author:** ![hacdias](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ipfs.tech/hacdias/32/8255_2.png) [@hacdias](https://discuss.ipfs.tech/u/hacdias)\ **Post date:** [June 12, 2023, 4:23pm UTC](https://discuss.ipfs.tech/t/kubo-v0-21-0-rc1-is-out/16557/2 "2023-06-12T16:23:15Z")
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**Author:** ![Jorropo](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ipfs.tech/jorropo/32/3230_2.png) [@Jorropo](https://discuss.ipfs.tech/u/Jorropo)\ **Post date:** [June 14, 2023, 12:50am UTC](https://discuss.ipfs.tech/t/kubo-v0-21-0-rc1-is-out/16557/3 "2023-06-14T00:50:37Z")
Note, we have found a pretty bad goroutine leak that makes the service performance bad and increasingly (but very slowly) increase memory usage. > > > @Jorropo reports: > Hey we have a goroutine leak somewhere in libp2p, is most lik…ely a deadlock does not happear with kubo v0.20 (libp2p v0.27.3) but do with kubo v0.21-rc1 (libp2p v0.27.5), I was trying to bisect it but it sometime does not appear so it made my bisect wrong. > Tested with v0.28.0 and v0.27.6 both still have the issue. > Here is the profile and screenshot https://ipfs.io/ipfs/QmZpLiWizT6HmnbSjWrwzcp7oAdSYo9e9fsZGQh3Zdd7wM > Getting stuck here: > https://github.com/libp2p/go-libp2p/blob/b4c9fed04afd7874c7390162481b67caa783d169/p2p/protocol/identify/id.go#L406 > https://github.com/libp2p/go-libp2p/blob/b4c9fed04afd7874c7390162481b67caa783d169/p2p/host/eventbus/basic.go#LL40C8-L40C8 > https://github.com/libp2p/go-libp2p/blob/b4c9fed04afd7874c7390162481b67caa783d169/p2p/host/eventbus/basic.go#L397 > You can start a new v0.21.0-rc1 Kubo node with accelerated DHT client (to generate a bunch of connection, you can also use the default client but will grow more slowly) and do ipfs diag profile then checkout goroutine.pprof most often has the issue. > > > \--- > > Issue being discussed here https://filecoinproject.slack.com/archives/C03FFEVK30F/p1686692108230159 We will fix this soon. ---
**Author:** ![hacdias](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ipfs.tech/hacdias/32/8255_2.png) [@hacdias](https://discuss.ipfs.tech/u/hacdias)\ **Post date:** [June 15, 2023, 1:28pm UTC](https://discuss.ipfs.tech/t/kubo-v0-21-0-rc1-is-out/16557/4 "2023-06-15T13:28:33Z")