Empty trashcan, random topics get deleted

[Mr. Jinx]

I'm not sure if this is a bug or something weird on my server:

Situation:
All deleted posts end up in the trashcan (yes that is correct ).
So lets say at some point there are 5 pages of trash in the trashcan.
Once in a while I clean up the trashcan by selecting the last page (page 5), and there I select all trashed posts and delete them for ever.

This takes a few seconds and then you return to the trashcan, but the weird thing is, there are still 5 pages of trash and all pages are full with deleted postings.
If you wait a few minutes, everything will be updates and you will finally see 4 pages left.

However, if you don't know this and select all posts on page 5 again, random normal topics will be deleted!
This has corrupted my forum for the second time now. First time because I didn't know about this, second time because one of the mods didn't know about this.

Anyone experienced this also, or know what is happening?
This is something I have noticed for a long time, so it's is not a recent bug or something.
My forum is pretty large with 600.000 topics.

[Kindred]

Never seen the before and I run a forum with 2 million posts...

What version of smf?
URL? Mods running?

[Mr. Jinx]

Currently I'm running 2.0.8, but this is something that I noticed about 2 years ago when I made my first mistake.
Since then, I always wait a few minutes after every delete.

In moderationlog, it shows this (when it goes wrong): Topic "" from "Trashcan" removed
There is no topic id.

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[margarett]

There has to be something cached.
Instead of waiting some minutes, can you empty your forum cache and check if the 5th page is gone?

However, if you don't know this and select all posts on page 5 again, random normal topics will be deleted!

I've been looking at MessageIndex.php

In moderationlog, it shows this (when it goes wrong): Topic "" from "Trashcan" removed

The code says:

Code Select Expand

// Only log the topic ID if it's not in the recycle board.
logAction('remove', array((empty($modSettings['recycle_enable']) || $modSettings['recycle_board'] != $removeCacheBoards[$topic] ? 'topic' : 'old_topic_id') => $topic, 'board' => $removeCacheBoards[$topic]));

So, it should be correct to not show you the topic ID. The topic *title* on the other hand, should be present...

You can debug what might be happening here with some debug code throughout MessageIndex.php but it looks quite... unique.

[Biology Forums]

It's a caching thing, I think. I've witnessed it too.

[Mr. Jinx]

Thanks for the replies. It does seem to be related to caching.

First I tried to empty the forum cache after deleting posts in the trashcan, that worked.
I also tried to disable the forum cache (using apc), and that worked also.