[BE] [Bug]: Lemmy 0.18.2 instances are not federating deletion of a post by user who created post #3588

github.com [Bug]: Lemmy 0.18.2 instances are not federating deletion of a post by user who created post · Issue #3588 · LemmyNet/lemmy

Requirements Is this a bug report? For questions or discussions use https://lemmy.ml/c/lemmy_support Did you check to see if this issue already exists? Is this only a single bug? Do not put multipl...

Requirements

[X] Is this a bug report? For questions or discussions use https://lemmy.ml/c/lemmy_support

[X] Did you check to see if this issue already exists?

[X] Is this only a single bug? Do not put multiple bugs in one issue.

[X] Is this a backend issue? Use the lemmy-ui repo for UI / frontend issues.

Summary

I suspect some bug in newer changes since 0.18.0 - as I think we would have noticed this earlier. All servers involved in example are running 0.18.2

Steps to Reproduce

Use a login on Lemmy.ml and go to the remote-homed community https://lemmy.ml/c/[email protected] and create a New Post.

Delete your new post after 30 seconds. Confirm it is deleted locally on Lemmy.ml - it should return an error page indicating couldnt_find_post

Go to the home instance of the community, see if the post still appears: https://lemm.ee/c/zztestlemmy000?dataType=Post&page=1&sort=New __

Technical Details

Using lemmy-ui front end, did not test with other API clients. The user is neither a moderator of the community or admin of either site.

Noteworthy that editing the title of a post did replicate correctly. It is deleting that seems to be the trouble. Testing of deleting a comment also worked fine.

Version

BE: 0.18.2

Lemmy Instance URL

lemm.ee lemmy.ml

Originally posted by RocketDerp in #3588

5 comments

We could create a more descriptive new issue (specific to comments), but we already have two going, so I don't mind mixing them together. The key thing here is that EDIT of POST or EDIT of COMMENT seems to work fine across all servers. Where DELETE of Post, (Mod) REMOVE of Post, DELETE of Comment, and possibly??? (Mod) REMOVE of Comment (needs testing) are not consistent between all subscribed severs.

Since the logging for this comment delete downstream subscriber needs be done on the "community home", let's use community: https://bulletintree.com/c/lemmy_testing0000 - which I run. I'll crank back on all the custom logging I added to the lemmy_server Rust code and figure out what code paths are happening.

Originally posted by RocketDerp in #3588
I posted this comment, https://lemm.ee/comment/1064577 on a post on lemmy.world. I ensured the comment federated out successfully to A) https://lemmy.ml/comment/1537853 B) https://lemmy.world/comment/1219669

I then deleted my comment. Almost immediately, the comment is also deleted from lemmy.world. But now, the next day, the comment is still on lemmy.ml

I'll do another test now, with lemmy.ml being the host server, so the devs can check their activity logs.

Originally posted by WayneSheppard in #3588
Someone else confirmed the problem in production by making a post on Lemmy about the topic: https://lemmy.ml/post/2066009

Originally posted by RocketDerp in #3588
I made a new comment, on a post hosted at lemmy.ml https://lemm.ee/comment/1099147

I verified that it federated out to the community server and four other subscribed servers. I then edited the comment, and again verified the edit was federated out to four subscribed servers. I then deleted the comment. The comment was deleted on my server, and the community server. But none of the subscribed servers deleted the post.

My comment on my home server (now deleted): https://lemm.ee/comment/1099147 My comment on the community server (now deleted): https://lemmy.ml/comment/1570775 My comment on the four subscribed servers is still there: https://lemmy.world/comment/1259376 https://sh.itjust.works/comment/1045913 https://lemmy.zip/comment/843702 https://lemmy.run/comment/278178

Originally posted by WayneSheppard in #3588
Your comment is still not deleted here on my instance: https://bulletintree.com/comment/724726

The "community home" server doesn't seem to be sending out delete comments to the federated downstream subscribers. Which is similar to what I've seen with moderator-removed posts #3535. It goes to two servers, but no more.

Originally posted by RocketDerp in #3588